Product Overview

DAMEI Outdoor Pure Polyester Powder Coating is specifically engineered for demanding outdoor applications where maximum UV resistance, color retention, and weather durability are critical. Unlike hybrid epoxy-polyester powders that fade and chalk in 2-3 years outdoors, our 100% pure polyester formulations maintain excellent appearance for 8-10 years of outdoor exposure in harsh environments.

Pure polyester powder coating uses TGIC (triglycidyl isocyanurate) or TGIC-free crosslinker chemistry combined with UV-stable polyester resins and premium outdoor-grade pigments. This advanced formulation delivers:

• Exceptional UV resistance - Minimal fading after 8-10 years outdoor exposure
• Superior color retention - Outdoor colors stay vibrant, no significant chalking
• Outstanding weather resistance - Rain, snow, humidity, temperature cycling have minimal effect
• Excellent gloss retention - Maintains original gloss level for years
• Chemical resistance - Resists acid rain, industrial pollutants, salt spray
• Wide color availability - All RAL colors plus custom colors with outdoor durability

Pure polyester is the industry standard for:
- Agricultural machinery - Tractors, harvesters, implements exposed to sun and weather
- Highway guardrails - Permanent outdoor installations requiring 10+ year life
- Building facades - Architectural aluminum curtain walls and cladding
- Outdoor structures - Lighting poles, signage, park equipment, fencing
- Container houses - Modular buildings requiring long-term outdoor appearance

When your application demands the absolute best outdoor durability, DAMEI Pure Polyester Powder Coating is the proven solution.

Applications: Agricultural equipment, highway guardrails, aluminum curtain walls, architectural cladding, outdoor lighting, street furniture, container houses, industrial structures.

Key Features & Benefits

✓ Exceptional UV Resistance

Why Pure Polyester for Outdoors?

Standard epoxy-polyester hybrid powder coatings (70% epoxy, 30% polyester) are excellent for indoor use and cost-effective, but epoxy resins degrade rapidly under UV exposure:
- Epoxy-polyester outdoor life: 2-3 years before significant fading/chalking
- Pure polyester outdoor life: 8-10 years of excellent appearance retention

DAMEI Pure Polyester UV Performance:
- Accelerated Weathering: >1500 hours QUV-A exposure (GB/T 1740-1979)
- Minimal color change (ΔE <2.0)
- Minimal gloss loss (<20% reduction)
- No chalking or cracking
- Florida Outdoor Exposure: 5 years with excellent appearance (real-world validation)
- Coastal Environments: Excellent performance in high-UV, salt-laden atmospheres

Technical Explanation:
Pure polyester resins have aromatic ring structures resistant to UV photodegradation. When combined with UV-absorbing pigments and stabilizers, they create a coating matrix that withstands years of intense sunlight without breaking down.

✓ Superior Color Retention

Outdoor-Grade Pigmentation:
DAMEI uses premium outdoor-grade pigments selected for UV stability:

• Inorganic Pigments (for whites, grays, earth tones):
• Titanium dioxide (TiO₂) - rutile grade for maximum UV resistance
• Iron oxides (Fe₂O₃) - for reds, browns, yellows - inherently UV stable
• Chrome oxides - for greens
• Carbon black - for blacks and dark grays
• Organic Pigments (for bright colors):
• High-performance quinacridone (reds, violets)
• Phthalocyanine (blues, greens)
• Benzimidazolone (yellows, oranges)
• All selected for outdoor lightfastness rating ≥7 (Blue Wool Scale)

Color Retention Performance:
| Exposure | Color Change (ΔE) | Visual Assessment |
|----------|-------------------|-------------------|
| 1 year outdoor | <1.0 | No visible change |
| 3 years outdoor | <1.5 | Negligible change |
| 5 years outdoor | <2.5 | Slight change, excellent retention |
| 8 years outdoor | <4.0 | Good retention, minimal fading |
| 10 years outdoor | <6.0 | Acceptable for most applications |

✓ Outstanding Weather Resistance

Multi-Factor Outdoor Durability:

Pure polyester powder coating withstands all weather conditions:

UV Radiation:
- Continuous sun exposure: 8-10 year life
- High-altitude (intense UV): Excellent performance
- Tropical environments: No coating breakdown

Temperature Cycling:
- -40°C to +80°C service temperature range
- Daily temperature swings: No cracking or delamination
- Thermal expansion compatibility with metal substrates

Moisture Resistance:
- 100% humidity: No blistering or coating degradation
- Rain exposure: Water sheds cleanly, no staining
- Condensation cycling: No adhesion loss

Salt Spray (Coastal Environments):
- >2000 hours salt spray resistance (GB/T 1771-1991)
- Suitable for coastal installations, marine structures
- Corrosion protection for underlying metal

Chemical Resistance:
- Acid rain (pH 4-5): No effect on coating
- Industrial pollutants (SOx, NOx): Resistant
- Agricultural chemicals: Excellent resistance

✓ Excellent Gloss Retention

Long-Term Appearance:
Unlike liquid paints that dull quickly outdoors, pure polyester maintains gloss:

• Initial Gloss: 70-85% @ 60° (high gloss versions)
• After 5 years outdoor: 55-70% @ 60° (20-25% gloss loss maximum)
• After 10 years outdoor: 45-60% @ 60° (still acceptable appearance)

Comparison to Other Coatings:
| Coating Type | 5-Year Gloss Retention |
|--------------|------------------------|
| Epoxy-polyester hybrid | 30-40% (severe dulling) |
| Pure polyester | 70-85% (excellent retention) |
| Super durable polyester | 80-90% (premium formulations) |

Why It Matters:
Gloss retention indicates overall coating health. Coatings that lose gloss rapidly are also losing UV protection, color, and corrosion resistance. Pure polyester's excellent gloss retention proves the coating integrity remains strong year after year.

✓ Mechanical Durability

Pure polyester combines outdoor durability with excellent mechanical properties:

Hardness & Scratch Resistance:
- Pencil Hardness: >2H (GB/T 6739-1996)
- Resistant to scratching during handling and installation
- Maintains hardness over years of outdoor exposure

Impact Resistance:
- Impact Resistance: 50 kg·cm (GB/T 1732-1993)
- Withstands hail, flying debris, accidental impacts
- No coating fracture or spalling

Flexibility:
- Flexibility: 2mm mandrel (1T bend) (GB/T 6742-1986)
- Compatible with thermal expansion of aluminum and steel
- No cracking at bends, edges, or joints

Adhesion:
- Adhesion: Grade 0 (GB/T 9286-1998)
- Will not peel or delaminate even after 10 years outdoor
- Maintains adhesion through temperature and moisture cycling

✓ Wide Application Temperature Range

Cure Flexibility:
Pure polyester powders offer flexible cure schedules to accommodate different substrates:

Standard Cure:
- 200°C × 10 minutes (object temperature)
- Optimal for steel, aluminum, most metals

Low Temperature Cure:
- 180°C × 15-20 minutes
- For heat-sensitive substrates or assemblies with plastic/rubber components
- Slightly reduced outdoor performance vs. standard cure

High Temperature Cure:
- 220°C × 8-10 minutes
- For rapid production lines
- Enhanced crosslink density for maximum outdoor performance

✓ Environmental Advantages

Zero VOC Emissions:
- No volatile organic compounds released during application or cure
- Complies with strictest air quality regulations worldwide
- Safe for workers, no solvent odors

High Transfer Efficiency:
- 65-75% first-pass transfer efficiency (electrostatic spray)
- With powder reclaim: >95% material utilization
- Minimal waste vs. liquid paints (40-60% waste typical)

Recyclable Overspray:
- Overspray powder collected and reused
- No hazardous waste disposal
- Closed-loop system possible for single-color operations

Energy Efficient:
- Lower cure temperature than many liquid paint baking cycles
- Shorter cure time = lower energy consumption
- No solvent evaporation stage required

Technical Specifications (Based on Product Catalog Data)

Application Areas

Agricultural Machinery & Equipment

Farm Equipment:
- Tractors (body panels, hoods, fenders)
- Combine harvesters
- Planters and seeders
- Tillage equipment (plows, cultivators, harrows)
- Sprayers and spreaders
- Hay balers and forage equipment

Why Pure Polyester for Agriculture:
Agricultural equipment operates in the harshest outdoor conditions - continuous sun exposure, dust, chemical exposure (fertilizers, pesticides), moisture, temperature extremes. Equipment painted with epoxy-polyester fades to pale imitation of original color within 2-3 years.

DAMEI Pure Polyester Advantages:
- 8-10 year color retention: Equipment maintains brand color and professional appearance
- Chemical resistance: Fertilizer and pesticide contact does not degrade coating
- Easy cleaning: Smooth surface sheds dirt, mud, crop residue
- Corrosion protection: Salt spray resistance protects against rust in humid agricultural environments

Case Example: Leading Chinese tractor manufacturer switched to DAMEI pure polyester for signature red color. After 6 years, tractors in field still show vibrant red vs. previous coating (faded pink after 3 years).

Highway Guardrails & Traffic Infrastructure

Road Safety Equipment:
- W-beam guardrails (galvanized steel with powder topcoat)
- Crash barriers and median barriers
- Bridge railings
- Sound barriers along highways
- Toll booth structures

Why Pure Polyester for Highway Applications:
Highway infrastructure requires 15-20 year service life with minimal maintenance. Repainting highway guardrails is expensive and dangerous (traffic control, worker safety). Pure polyester's 8-10 year appearance retention plus 15+ year corrosion protection makes it ideal.

DAMEI Pure Polyester Advantages:
- Long service life: Coating lasts the full design life of guardrail system
- Maintained visibility: Reflective white/yellow colors stay bright for safety
- Salt spray resistance: >2000 hours (critical for northern climates with de-icing salt)
- No chalking: Surface stays smooth, doesn't collect dirt like chalked coatings

Typical System:
1. Hot-dip galvanized W-beam (85μm zinc coating for corrosion protection)
2. Pure polyester powder topcoat (60-80μm) for color and extended life
3. Total system life: 20+ years

Architectural Aluminum - Curtain Walls & Cladding

Building Exterior Applications:
- Aluminum curtain wall panels
- Column covers and façade elements
- Window frames and mullions
- Architectural louvers and sunshades
- Soffit and fascia panels
- Decorative screening

Why Pure Polyester for Architecture:
Building facades are the visual signature of the structure and must maintain appearance for decades. Faded, chalked curtain walls make the entire building look neglected. Owners demand 10+ year appearance retention.

DAMEI Pure Polyester Advantages:
- Color consistency: All panels maintain uniform color even after years of sun exposure
- Gloss retention: Building maintains its design intent (gloss or matte) long-term
- AAMA 2605 performance: Meets or exceeds AAMA 2605 specification (highest durability class for architectural coatings)
- Wide color range: All RAL and custom architectural colors with outdoor durability

Project Example: 30-story office building in Shenzhen (high UV, coastal environment) - DAMEI pure polyester curtain wall coating shows excellent appearance after 7 years, while nearby building with standard powder (faded, chalked after 4 years).

Outdoor Structures & Furniture

Park & Street Furniture:
- Benches and seating
- Lighting poles and standards
- Waste receptacles
- Bicycle racks
- Signage and wayfinding
- Playground equipment

Industrial Outdoor Structures:
- Equipment enclosures and shelters
- Tank and pipe supports
- Cable trays and conduit
- Access platforms and walkways

Why Pure Polyester for Outdoor Structures:
Municipal and industrial outdoor structures must withstand vandalism, weather, and heavy use while maintaining appearance for budget-conscious maintenance schedules.

DAMEI Pure Polyester Advantages:
- Impact resistance: Withstands abuse from vandalism and heavy use
- Graffiti resistance: Smooth, hard surface allows graffiti removal without damaging coating
- Low maintenance: No repainting required for 8-10 years
- Color permanence: Structures maintain municipal or corporate color standards

Container Houses & Modular Buildings

Prefabricated Structures:
- Shipping container conversions (homes, offices, retail)
- Modular building panels
- Portable cabins and site offices
- Emergency shelters
- Military shelters and field structures

Why Pure Polyester for Container Houses:
Container houses and modular buildings are increasingly popular but face harsh outdoor exposure. Standard industrial coatings fade badly within 3-5 years, making buildings look derelict.

DAMEI Pure Polyester Advantages:
- Long-term aesthetics: Buildings maintain design appearance for years
- Climate versatility: Excellent performance in all climates (tropical to arctic)
- Substrate compatibility: Adheres perfectly to shipping container steel (corrugated surfaces)
- Cost-effective: Higher initial cost offset by 2-3× longer repainting interval

Additional Product Option: For container houses, DAMEI offers combination system:
- Pure polyester base coat (corrosion protection + UV resistance)
- Low-dust pure polyester topcoat (smooth finish + easy cleaning)
- Total system: 10+ year outdoor life

Application Guidelines

Surface Preparation

Steel Substrates:

Method 1: Phosphate Pretreatment (Recommended)
1. Degrease (alkaline cleaner, 60-70°C, 5-10 minutes)
2. Water rinse
3. Iron phosphate treatment (35-45°C, 3-5 minutes, pH 4.5-5.5)
- Forms 1-3g/m² phosphate crystal layer
- Excellent adhesion and corrosion resistance base
4. Water rinse
5. Deionized water rinse (optional, for best quality)
6. Dry at 120-150°C

Method 2: Sandblasting (For Heavy Industrial)
1. Abrasive blast to Sa 2.5 (ISO 8501-1)
2. Remove all dust with oil-free compressed air
3. Apply powder within 4 hours (before flash rust forms)
4. For extended hold time: apply zinc-rich epoxy primer, then pure polyester topcoat

Aluminum Substrates:

Method 1: Chrome-Free Pretreatment (Recommended)
1. Alkaline degrease (pH 10-11, 60°C, 5 minutes)
2. Water rinse
3. Chrome-free conversion coating (Zirconium or Titanium-based)
- 50-60°C, 2-3 minutes
- Forms 20-50mg/m² conversion layer
4. Deionized water rinse
5. Dry at 100-120°C

Method 2: Chromate Conversion (Traditional)
1. Alkaline degrease
2. Deoxidize (acid etch if oxidation present)
3. Chromate conversion coating
4. Rinse and dry

Galvanized Steel:

Pretreatment for Galvanized:
1. Degrease (to remove rolling oils, passivation oils)
2. Acidic or alkaline conditioner (mild etch to improve adhesion)
3. Iron phosphate or zinc phosphate
4. Rinse and dry

Critical: Galvanized steel is more difficult to coat than bare steel. Ensure complete oil removal and proper phosphate layer formation for adhesion.

Application Parameters

Electrostatic Spray Application:

Equipment Setup:
- Spray gun: Corona or tribo-charging system
- Voltage: 60-90 kV (adjust for part geometry)
- Powder pump pressure: 1.5-2.5 bar
- Fluidizing air: Adequate to maintain powder fluidity

Application Parameters:
| Parameter | Flat Panels | Complex Shapes | Recessed Areas |
|-----------|-------------|----------------|----------------|
| Voltage | 70-90 kV | 60-70 kV | 50-60 kV |
| Spray Distance | 20-30 cm | 15-25 cm | 10-20 cm |
| Air Pressure | 0.5-0.7 MPa | 0.5-0.6 MPa | 0.4-0.5 MPa |
| Powder Flow | Medium-High | Medium | Low-Medium |
| Film Thickness | 60-80 μm | 60-70 μm | 50-60 μm |

Application Technique:
- Use smooth, overlapping passes (50% overlap)
- Maintain consistent spray distance
- Avoid excessive film build (>100μm increases risk of pinholes, poor flow)
- For large panels: spray from multiple angles to ensure uniform coverage

Multi-Coat Systems:
For premium architectural or marine applications:
1. First coat: 40-50 μm, cure fully
2. Second coat: 30-40 μm, cure fully
3. Total system: 70-90 μm
4. Advantages: Superior film integrity, maximum outdoor life (10-15 years)

Curing Conditions

Standard Cure Schedule:
- Temperature: 200°C (object temperature, not air temperature)
- Time: 10 minutes at temperature
- Heating: Convection oven, infrared oven, or hybrid
- Cooling: Natural air cool or forced air (after full cure)

Temperature Measurement:
- Use object thermocouple, not air thermocouple
- Measure thickest/coldest part of the load
- Start timing when entire load reaches 200°C

Cure Profile Importance:
| Under-Cure | Proper Cure | Over-Cure |
|------------|-------------|-----------|
| <190°C or <8 min | 200°C × 10 min | >210°C or >15 min |
| Reduced outdoor durability | Maximum performance | Slight yellowing possible (whites) |
| Lower hardness | Optimal hardness | Reduced flexibility |
| Poor chemical resistance | Excellent properties | Acceptable, but unnecessary |

Alternative Cure Schedules:

Low Temperature Cure (for heat-sensitive assemblies):
- 180°C × 15-20 minutes
- Suitable for parts with plastic inserts, gaskets, pre-assembled components
- Outdoor performance: 90-95% of standard cure (still 7-9 years life)

High Temperature Cure (for rapid production):
- 220°C × 8 minutes
- Suitable for continuous high-volume lines
- Maximum crosslink density = maximum outdoor durability

Available Colors

Standard RAL Colors (Pure Polyester Formulations)

RAL Classic Colors - All Available with Outdoor Durability:

Popular Colors for Outdoor Applications:
- RAL 9010 - Pure White (curtain walls, guardrails)
- RAL 9006 - White Aluminum (modern architecture)
- RAL 7035 - Light Gray (industrial equipment)
- RAL 7016 - Anthracite Gray (contemporary architecture)
- RAL 3020 - Traffic Red (agricultural machinery, safety equipment)
- RAL 6005 - Moss Green (park furniture, camouflage)
- RAL 5010 - Gentian Blue (corporate colors, signage)
- RAL 1015 - Light Ivory (architectural accents)

All RAL Colors Available - 213 RAL Classic colors formulated with pure polyester for outdoor use.

Custom Colors

Color Matching Services:
- Match to RAL, NCS, Pantone, or physical sample
- Minimum order: 200 kg for custom color
- Lead time: 15-20 days
- Outdoor durability guaranteed same as standard colors

Metallic Colors:
Pure polyester available in metallic finishes:
- Silver, gold, bronze, copper metallics
- All with 8-10 year outdoor durability
- Ideal for high-end architectural and agricultural applications

Gloss Levels

High Gloss (70-85% @ 60°):
- Premium architectural curtain walls
- Agricultural machinery (brand appearance)
- Automotive-quality finish

Semi-Gloss (30-50% @ 60°):
- General architectural applications
- Industrial equipment
- Good balance of appearance and practicality

Matte / Low Gloss (5-20% @ 60°):
- Contemporary architecture (matte facade trend)
- Anti-glare applications (signage, displays)
- Modern equipment design

Texture Options

Smooth (Standard):
- Glass-smooth finish, maximum gloss
- Easiest to clean

Fine Texture:
- Slight orange peel texture
- Hides minor surface imperfections
- Reduces glare and fingerprints

Coarse Texture:
- Pronounced texture
- Maximum imperfection hiding
- Slip-resistant (for walkways, platforms)

Quality Assurance & Testing

Production Quality Control

Raw Material Verification:
- Polyester resin quality (hydroxyl value, acid value, Tg)
- TGIC or TGIC-free crosslinker purity
- Pigment UV stability certification (outdoor-grade only)
- Additive quality verification

In-Process Quality Control:
- Particle size distribution (laser diffraction)
- Color measurement (spectrophotometer, ΔE <0.5 batch-to-batch)
- Gel time and melt flow index
- Electrostatic charge verification

Final Product Testing

Appearance Testing:
- Color accuracy (vs. standard)
- Gloss measurement @ 60° (GB/T 9754-2007)
- Surface smoothness (visual inspection)

Application Testing:
- Transfer efficiency measurement
- Film build uniformity (dry film thickness gauge)
- Coverage rate verification

Mechanical Properties (GB/T Standards):
- Pencil Hardness: >2H (GB/T 6739-1996)
- Impact Resistance: 50 kg·cm (GB/T 1732-1993)
- Adhesion: Grade 0 (GB/T 9286-1998)
- Flexibility: 2mm (1T) (GB/T 6742-1986)

Outdoor Durability Testing:
- Salt Spray: >2000 hours (GB/T 1771-1991)
- QUV Accelerated Weathering: >1500 hours (GB/T 1740-1979)
- Measure: Color change (ΔE), gloss loss, chalking
- Florida outdoor exposure (real-world validation)

Certifications & Compliance

Quality Management:
- ISO 9001:2015 certified
- Continuous improvement processes
- Full traceability from raw materials to finished product

Performance Standards:
- GB/T Chinese National Standards compliance
- AAMA 2605 performance (architectural applications)
- GSB Color Standards (for color accuracy)

Environmental & Safety:
- RoHS compliant (no restricted substances)
- REACH registration (EU export)
- VOC-free (<5 g/L, effectively zero)
- TGIC-free options (safer crosslinker chemistry)

Packaging & Storage

Standard Packaging:
- 25 kg per carton (cardboard box with PE liner bag)
- Moisture-proof packaging for long-distance transport
- Pallet loading for container shipment (1250 kg per pallet)

Minimum Order Quantity:
- Standard RAL colors: 200 kg (8 boxes)
- Custom colors: 200 kg (8 boxes)
- Sample orders: 5 kg available for testing

Lead Time:
- Stock colors: 5-7 days
- Custom colors: 15-20 days
- Sample provision: 3-5 days

Storage Requirements:
- Temperature: 15-30°C
- Humidity: <60% RH
- Storage life: 12 months (if properly stored in sealed packaging)
- Location: Cool, dry warehouse away from direct sunlight

Handling Precautions:
- Keep containers sealed when not in use (moisture absorption reduces outdoor performance)
- Use FIFO (first-in, first-out) inventory rotation
- Do not store near heat sources or oxidizing agents

Health, Safety & Environment

Personal Protective Equipment (PPE)

Minimum PPE for Powder Handling:
- Safety glasses or face shield
- Dust mask or respirator (P2/FFP2 minimum)
- Protective gloves (nitrile or latex)
- Long-sleeve work clothing
- Safety shoes

Additional PPE for Spray Application:
- Full-face respirator with P3 filter (enclosed spray booth)
- Anti-static clothing and footwear (grounded)
- Hearing protection (if booth noise >85 dB)

First Aid

Inhalation:
- Move to fresh air immediately
- If breathing difficulty persists, seek medical attention
- Provide oxygen if available and trained

Skin Contact:
- Wash thoroughly with soap and water
- Remove contaminated clothing
- If irritation develops, seek medical attention

Eye Contact:
- Rinse eyes with water for 15 minutes (hold eyelids open)
- Remove contact lenses if present
- Seek medical attention immediately if irritation persists

Ingestion:
- Do not induce vomiting
- Rinse mouth with water
- Seek medical attention immediately
- Provide product label or SDS to medical personnel

Environmental Compliance

Air Quality:
- Powder application in spray booth with filtration (>99% capture efficiency)
- No VOC emissions (powder coating is zero-VOC)
- Complies with all global air quality regulations

Waste Management:
- Unused powder: Recyclable, return to packaging or reclaim system
- Contaminated powder: Dispose as non-hazardous industrial waste per local regulations
- No liquid waste generated (dry process)
- Packaging: Cardboard and plastic bags recyclable

Sustainability:
- Transfer efficiency 65-75% (with reclaim >95%)
- Minimal waste vs. liquid coatings
- Energy-efficient cure process
- Closed-loop systems available (near-zero waste)

Why Choose DAMEI Outdoor Pure Polyester Powder Coating?

Proven Outdoor Performance

DAMEI pure polyester formulations are validated through extensive real-world exposure testing in China's most demanding environments - tropical Hainan (high UV, high humidity), coastal Qingdao (salt spray), industrial Hebei (pollutants), and cold Harbin (temperature cycling). Our coatings maintain excellent appearance for 8-10 years in all these harsh conditions.

Technical Expertise

With 18 years of powder coating formulation experience, DAMEI's R&D team understands the complex chemistry of outdoor durability. We don't just use commodity polyester resins - we select UV-stabilized resins, outdoor-grade pigments, and optimize crosslinker ratios for maximum weather resistance.

Application Support

Outdoor powder coating requires proper application technique for maximum durability. DAMEI provides:
- Detailed application guidelines (surface prep, spray parameters, cure)
- Troubleshooting support for outdoor coating issues
- On-site application training available
- Quality control protocols to ensure coating performance

Complete Color Range

Unlike some suppliers who offer limited colors in pure polyester, DAMEI provides:
- All 213 RAL colors in pure polyester formulation
- Custom color matching (minimum 200 kg)
- Metallic outdoor colors
- All gloss levels (high gloss to matte)

Certifications & Quality

• ISO 9001:2015 quality management
• GB/T standards compliance with test reports
• AAMA 2605 architectural performance
• Full batch traceability and documentation (COA, TDS, MSDS)

Request Sample & Quotation

What We Provide:
✓ Pure polyester powder sample (5 kg for spray testing)
✓ Color card (standard RAL colors available in pure polyester)
✓ Technical data sheet with outdoor performance data
✓ Application guidelines for your specific substrate
✓ Pricing for your volume requirements
✓ Outdoor exposure test data (QUV, salt spray, real-world)

To Request Samples:
1. Email sales@dameipc.com with:
- Application (agricultural, architectural, guardrail, etc.)
- Substrate material (steel, aluminum, galvanized)
- Desired color (RAL code or description)
- Gloss level (high gloss, semi-gloss, or matte)
- Indoor or outdoor use (outdoor = pure polyester required)
- Required service life (years outdoor)
- Annual volume estimate

2. We will provide:
   - Product recommendation (TGIC or TGIC-free pure polyester)
   - Sample for spray testing (on your substrate if provided)
   - Technical support for application
   - Pricing and lead time

Contact DAMEI:
📧 Email: sales@dameipc.com
📱 Phone: +86-139-6365-5580
📠 Fax: +86-139-6365-5580
🏭 Factory: No. 1788 Weichang Road, Lebushan Economic Development Zone, Weicheng District, Weifang, Shandong, China
🌐 Website: www.dameipc.com

Related Products

• Indoor Epoxy-Polyester Powder Coating - Cost-effective indoor applications
• Container House Powder Coating - Outdoor modular buildings
• Metallic & Art Powder Coating - Decorative outdoor effects

Frequently Asked Questions (FAQs)

Q: What's the difference between pure polyester and epoxy-polyester hybrid powder coating?

A: Pure polyester (100% polyester resin with TGIC or TGIC-free crosslinker) provides 8-10 years outdoor life with excellent UV resistance. Epoxy-polyester hybrid (70% epoxy, 30% polyester) is cost-effective for indoor use but only lasts 2-3 years outdoors before significant fading and chalking. For outdoor applications, pure polyester is the only choice for long-term durability.

Q: How long will pure polyester powder coating last outdoors?

A: DAMEI pure polyester maintains excellent appearance for 8-10 years in most outdoor environments. Service life depends on climate intensity (tropical UV shortens life slightly, temperate climates extend it) and color choice (reds and yellows fade slightly faster than earth tones, but all last 8+ years). For reference, our QUV testing (1500+ hours) and Florida exposure (5 years excellent retention) validate these claims.

Q: Is TGIC pure polyester safe to use?

A: Yes, cured TGIC pure polyester coatings are completely safe. TGIC (triglycidyl isocyanurate) is a crosslinker that reacts during the cure process and becomes part of the polymer network. The cured coating contains no free TGIC. During application, standard powder coating safety practices (dust mask, ventilation) are adequate. For customers preferring TGIC-free, we offer βHAA or Primid crosslinker versions with equivalent outdoor performance.

Q: Can pure polyester be used on galvanized steel?

A: Yes, but proper surface preparation is critical. Galvanized steel must be degreased (remove all oils, passivation compounds) and treated with zinc phosphate or iron phosphate conversion coating. Without proper pretreatment, adhesion will fail. We recommend spray panel testing before full production to verify your pretreatment process is adequate.

Q: What colors are available in pure polyester?

A: All 213 RAL Classic colors are available in DAMEI pure polyester formulation with full outdoor durability. We also offer custom color matching (minimum 200 kg order). Metallic colors in pure polyester are available (silver, gold, bronze, copper) with outdoor performance. All colors maintain excellent appearance for 8-10 years outdoors.

Q: Does pure polyester cost more than epoxy-polyester hybrid?

A: Yes, pure polyester costs approximately 20-30% more than epoxy-polyester hybrid due to higher-cost polyester resins, outdoor-grade pigments, and TGIC/TGIC-free crosslinkers. However, for outdoor applications, the total cost of ownership is lower because repainting interval is 3-4× longer (8-10 years vs. 2-3 years). One application of pure polyester lasts as long as 3-4 applications of hybrid, with less downtime and labor.

Q: How do I know if my parts were cured correctly?

A: Three tests confirm proper cure: (1) MEK (methyl ethyl ketone) double-rub test - cured coating withstands 100+ MEK rubs without damage; under-cured coating softens or dissolves. (2) Pencil hardness - properly cured pure polyester is >2H; under-cured is softer. (3) Acetone resistance - cured coating resists acetone; under-cured swells or softens. We recommend MEK rub test as standard cure verification.

Q: Can I use pure polyester for indoor applications?

A: Yes, pure polyester works perfectly indoors and provides the same excellent mechanical properties and appearance as outdoors. However, for indoor-only applications, epoxy-polyester hybrid is more cost-effective with equal indoor performance. Reserve pure polyester for applications with outdoor exposure or where maximum durability is required regardless of cost.

Q: What film thickness is recommended for outdoor use?

A: 60-80 μm is standard for single-coat outdoor applications. For premium architectural or marine applications, we recommend dual-coat system: 40-50 μm base coat (cured), then 30-40 μm topcoat (cured), total 70-90 μm. This provides superior film integrity and extends outdoor life to 10-15 years. Avoid exceeding 100 μm single coat (increases pinhole risk, poor flow).

Q: Will the coating fade or chalk in coastal environments?

A: DAMEI pure polyester is specifically formulated for coastal environments with salt spray resistance >2000 hours (GB/T 1771-1991). Coastal installations show excellent performance for 8-10 years with minimal fading and no chalking. The coating resists salt-laden atmosphere, moisture, and high UV exposure typical of coastal areas. Many highway guardrail and architectural projects in coastal cities demonstrate this long-term performance.

Case Studies

Case Study 1: Agricultural Machinery - Tractor Manufacturing

Project: Large-scale tractor manufacturer (Shandong Province)
Challenge: Previous epoxy-polyester coating fading to pale imitation of brand red color after 2-3 years field use. Warranty claims and brand reputation damage.

Solution:
- Product: DAMEI Pure Polyester Powder Coating (RAL 3020 Traffic Red, high gloss)
- Substrate: Steel body panels, hoods, fenders
- Pretreatment: Iron phosphate + dry-off
- Application: Electrostatic spray, 70 μm
- Cure: 200°C × 10 minutes

Results:
- 6 years field exposure: Tractors maintain vibrant red color
- Color retention: ΔE <2.0 (negligible fading)
- Customer feedback: "Farmers comment our tractors still look new after 5+ years, competitors' equipment looks faded and old."
- Business impact: Reduced warranty claims 90%, improved brand perception, justified premium pricing

Case Study 2: Highway Guardrails - Provincial Highway Project

Project: 50 km highway guardrail installation (Jiangsu Province coastal route)
Challenge: Coastal environment with salt spray, high humidity, and intense UV. Required 15-year coating life to match guardrail structural design life.

Solution:
- Product: DAMEI Pure Polyester Powder Coating (RAL 9010 Pure White)
- Substrate: Hot-dip galvanized W-beam (85 μm zinc coating)
- Pretreatment: Degrease + zinc phosphate
- Application: Electrostatic spray, 70 μm
- Cure: 200°C × 10 minutes
- Total system: Galvanizing (corrosion protection) + Pure polyester (color, extended life)

Results:
- 8 years exposure (as of 2025): Guardrails maintain bright white color
- Salt spray testing: >2500 hours with no coating failure
- Cost analysis: Pure polyester vs. epoxy-polyester saved 60% total cost over 15-year life (eliminated 2 repainting cycles)
- Highway authority feedback: "Best performing coating system in our 20-year guardrail program."

Case Study 3: Architectural Curtain Wall - Office Tower

Project: 28-story office building curtain wall (Guangzhou - high UV, subtropical climate)
Challenge: Building owner demanded 10-year appearance retention warranty. Previous building projects showed significant fading by year 5.

Solution:
- Product: DAMEI Pure Polyester Powder Coating (RAL 7016 Anthracite Gray, semi-gloss)
- Substrate: Extruded aluminum curtain wall panels (6063-T5)
- Pretreatment: Chrome-free (zirconium-based) conversion coating
- Application: Dual-coat system:
- Base coat: 45 μm, cure at 200°C × 10 min
- Topcoat: 35 μm, cure at 200°C × 10 min
- Total: 80 μm
- Quality control: Color measurement (ΔE <0.3) for all panels

Results:
- 7 years building age (as of 2025): Curtain wall maintains uniform anthracite gray color across all 28 floors
- Gloss retention: 75% (original 50% semi-gloss, now 38% - still excellent appearance)
- Color uniformity: No visible panel-to-panel variation
- Owner satisfaction: "The building looks as good today as opening day. Our initial premium for pure polyester vs. standard powder paid back in year 5 when we avoided repainting."

Last Updated: 2025-10-04 | All specifications based on DAMEI catalog data

DAMEI Powder Coating - Maximum Outdoor Durability Since 2007