Product Overview

DAMEI Grooved Pipe Fitting Powder Coating is specifically formulated for grooved pipe couplings, fittings, and accessories used in fire protection, HVAC, and industrial piping systems. Our coating provides superior corrosion protection and mechanical durability to ensure long-lasting performance in demanding industrial environments.

Grooved mechanical pipe joining systems have become the industry standard for fire sprinkler installations, HVAC piping, and industrial process lines due to their fast installation and reliable performance. However, these fittings require high-quality protective coatings to prevent corrosion and maintain system integrity over decades of service.

DAMEI's specialized formula addresses the unique challenges of coating grooved fittings:

• Excellent edge coverage on complex fitting geometries
• Superior corrosion resistance for 10+ years of protection
• Fast curing compatible with high-volume production lines
• Excellent mechanical properties to withstand installation stresses
• Available in fire protection red and other standard colors

With partnerships with major grooved fitting manufacturers across China, DAMEI has become a trusted coating supplier for millions of fittings installed in critical fire protection and industrial systems worldwide.

Key Features & Benefits

✓ Optimized for Complex Geometries

Grooved fittings have intricate shapes with recessed areas, gasket grooves, and bolt holes. Our powder's optimized particle size distribution and charging characteristics ensure excellent coverage even in hard-to-reach areas, minimizing uncoated spots that could lead to corrosion.

✓ Superior Corrosion Protection

Formulated with advanced anticorrosive pigments and high-performance resins:
- Salt spray resistance: >1000 hours (ASTM B117)
- Humidity resistance: >500 hours @ 100% RH
- Chemical resistance: Excellent resistance to water, mild acids, alkalis
- Suitable for underground and outdoor installations

✓ Excellent Adhesion & Flexibility

Critical for fittings subjected to installation stresses:
- Adhesion: Grade 0 (ISO 2409) - no delamination
- Impact resistance: 80 kg·cm, withstands installation impacts
- Flexibility: Pass 1T bend test without cracking
- Resistant to bolt tightening stresses

✓ Fire Protection System Approved

Our red powder coating meets requirements for fire sprinkler system components:
- Bright, long-lasting red color for easy system identification
- No degradation from water exposure
- Compatible with EPDM and other gasket materials
- Meets ASTM and GB standards for fire protection equipment

✓ Fast Production Cycle

Optimized curing schedule for high-volume fitting production:
- Cure at 180-200°C in 10-15 minutes
- Suitable for automated powder coating lines
- Excellent powder flow for consistent coverage
- High first-pass yield reduces rework

✓ Wide Color Range

• Fire Protection Red: Standard red for fire sprinkler fittings
• RAL Colors: RAL 3000, RAL 3002, RAL 3009 (red shades)
• Other Colors: Available for non-fire applications
• Custom Colors: Color matching services available

Technical Specifications

Application Areas

Fire Sprinkler Systems

Our powder coating is the industry-standard choice for fire protection piping components:

Grooved Fittings:
- Mechanical tees and crosses
- Elbows (45°, 90°)
- Reducers and adapters
- Caps and plugs
- Flanged adapters

Grooved Couplings:
- Rigid couplings
- Flexible couplings
- Reducing couplings
- Shouldered couplings

Advantages in Fire Systems:
- Bright red color for immediate system identification
- Excellent corrosion resistance in wet environments
- No coating degradation from water exposure
- Compatible with standard EPDM gaskets
- Meets fire marshal inspection requirements

HVAC Systems

Ideal for heating, ventilation, and air conditioning piping:

Applications:
- Chilled water systems
- Hot water heating systems
- Condenser water piping
- Cooling tower piping
- Hydronic systems

Benefits:
- Corrosion protection in humid environments
- Thermal stability for hot water systems
- Chemical resistance to water treatment chemicals
- Long service life (10+ years)

Industrial Process Piping

Suitable for various industrial fluid handling systems:

Industries:
- Chemical processing plants
- Power generation facilities
- Mining operations
- Manufacturing plants
- Food & beverage processing

Applications:
- Compressed air systems
- Process water piping
- Chemical transfer lines (with proper chemical compatibility verification)
- Wastewater treatment systems

Plumbing Systems

Commercial and residential plumbing applications:
- Potable water systems (with appropriate certification)
- Drainage systems
- Rainwater harvesting systems
- Irrigation systems

Why Grooved Fitting Manufacturers Choose DAMEI

Challenge 1: Coating Recessed Areas

Problem: Standard powders have poor penetration into grooves, gasket recesses, and bolt holes, leaving unprotected areas vulnerable to corrosion.

DAMEI Solution: Our optimized particle distribution and electrostatic charging ensures excellent Faraday cage penetration, providing complete coverage even in deep recesses.

Challenge 2: Coating Adhesion Under Stress

Problem: Grooved fittings undergo significant mechanical stress during installation (bolt tightening, gasket compression). Poor adhesion leads to coating cracking or delamination.

DAMEI Solution: Advanced resin formulation provides exceptional flexibility and adhesion. Coating withstands installation stresses without cracking or peeling.

Challenge 3: Long-Term Corrosion Protection

Problem: Fire sprinkler systems may sit idle for years with residual water, creating corrosive environments. Standard coatings may fail prematurely.

DAMEI Solution: Premium anticorrosive pigments and high-crosslink-density resins provide >1000 hours salt spray resistance and excellent water immersion resistance.

Challenge 4: Production Efficiency

Problem: Complex fitting shapes require multiple spray passes and long cure times, reducing production throughput.

DAMEI Solution: Excellent powder flow and fast cure schedule (10-15 minutes @ 180-200°C) maximize production efficiency while maintaining quality.

Application Process Guidelines

Surface Preparation

Critical for long-term corrosion protection:

Step 1: Degreasing
- Remove all machining oils, cutting fluids, and rust preventatives
- Alkaline spray or immersion degreasing
- Hot water rinse (60-80°C)
- Complete oil removal verified

Step 2: Surface Treatment
For machined fittings (elbows, tees from bar stock):
- Shot blasting recommended for machined surfaces
- Remove all tool marks and surface irregularities
- Achieve Sa 2.5 surface cleanliness

For formed fittings (pressed or stamped):
- Chemical etching may be sufficient
- Ensure complete scale and rust removal

Step 3: Phosphating
- Zinc phosphate (recommended): 2.0-4.0 g/m² coating weight
- Iron phosphate (acceptable): 0.5-1.5 g/m² coating weight
- Thorough rinsing after phosphating
- Verify uniform phosphate crystal structure

Step 4: Drying
- Complete moisture removal before powder coating
- Oven drying: 120-150°C for 10-15 minutes
- No water spots or moisture residue
- Cool to 40-60°C before powder application

Powder Application for Grooved Fittings

Equipment Setup:
- Corona charging guns recommended for complex shapes
- Multiple gun angles for complete coverage
- Automatic reciprocators for high-volume production
- Manual touch-up for critical recessed areas

Application Parameters:

Critical Areas Requiring Attention:
- Gasket groove interiors
- Bolt hole threads
- Coupling housing interiors
- Behind attachment lugs
- Sharp edges and corners

Application Technique:
1. First pass: Overall coverage of exterior surfaces
2. Second pass: Focus on recessed areas, grooves, bolt holes
3. Third pass (if needed): Touch-up of any missed spots
4. Target film thickness: 60-80 μm

Curing Process

Standard Cure Schedule:
- Preheat: Gradual heat-up to avoid thermal shock
- Cure Temperature: 180-200°C (measured on fitting surface)
- Cure Time: 10-15 minutes at temperature
- Cooling: Slow cooling to prevent thermal stress cracking

Oven Considerations for Fittings:
- Ensure adequate spacing between fittings for air circulation
- Avoid direct contact with oven surfaces
- Use appropriate hanging/racking to prevent coating damage
- Verify temperature uniformity (±5°C maximum variation)

Cure Verification:
- MEK (methyl ethyl ketone) double rub test
- Crosshatch adhesion test on sample fittings
- Visual inspection for complete cure (no soft spots)

Quality Assurance

Incoming Inspection

Every batch of grooved fittings should undergo pre-coating inspection:
- Surface cleanliness verification
- Phosphate coating uniformity
- Dimensional verification
- Material certification review

In-Process Quality Control

• Continuous monitoring of powder application parameters
• Film thickness measurements (60-80 μm target)
• Visual inspection for coverage completeness
• Regular crosshatch adhesion testing

Final Product Testing

Finished coated fittings tested per GB/T standards:
- Adhesion (cross-cut test)
- Impact resistance
- Flexibility
- Salt spray resistance (sample basis)
- Color consistency verification

Batch Traceability

Complete documentation for each production batch:
- Powder lot number
- Application date and parameters
- Cure cycle records
- Quality test results
- Certificate of Compliance

Available Colors

Fire Protection Standard Colors

Fire Sprinkler Red:
- RAL 3000 (Flame Red) - Most common
- RAL 3002 (Carmine Red)
- RAL 3009 (Oxide Red)
- Custom fire protection red to match specifications

Color Characteristics:
- High color fastness (minimal fading)
- UV resistant pigments
- Batch-to-batch consistency: ΔE <1.5
- Gloss: 30-50% (semi-gloss standard)

Other Standard Colors

For non-fire applications (HVAC, industrial):
- Black: RAL 9005 (common for industrial piping)
- Gray: RAL 7035, RAL 7037
- Blue: RAL 5010, RAL 5015
- Green: RAL 6029 (for specific piping codes)
- Orange: RAL 2004 (for specific systems)

Custom Color Matching

• Match to any RAL, Pantone, or customer sample
• Minimum order: 200 kg for custom colors
• Sample approval before production
• Color tolerance: ΔE <1.0

Packaging & Logistics

Standard Packaging

• Box Size: 25 kg net weight per carton
• Inner Protection: Sealed PE bag with desiccant
• Pallet: 1250 kg per pallet (50 boxes)
• Container: 10-12 tons per 20' container
• Shelf Life: 6 months (unopened, stored <30°C)

Minimum Order Quantities

• Fire Protection Red (stock color): 200 kg (8 boxes)
• Other RAL Standard Colors: 200 kg (8 boxes)
• Custom Colors: 200 kg (8 boxes)
• Sample Quantity: 5 kg for testing

Delivery Times

• Stock Colors: 3-5 working days
• Standard RAL Colors: 7-10 working days
• Custom Color Development: 10-14 working days
• Large Orders (>5 tons): 14-21 working days

Shipping Methods

• Domestic China: Truck delivery, 5-7 days
• International: Sea freight (economical, 25-40 days)
• Urgent Orders: Air freight available (5-10 days)
• Tracking: Full shipment tracking provided

Storage & Handling

Proper Storage Conditions

• Temperature: <30°C (avoid temperature fluctuations)
• Humidity: <70% RH (dry, well-ventilated area)
• Light: Avoid direct sunlight
• Separation: Away from heat sources and ignition sources
• Stacking: Maximum 5 pallets high
• Inventory: FIFO rotation recommended

Shelf Life Management

• Unopened: 6 months under proper conditions
• Opened Bags: Reseal immediately, use within 2 months
• Testing: Retest powder after 6 months if stored correctly
• Quality: Powder that passes retest is suitable for use

Handling Precautions

• Avoid contamination with moisture, dirt, other powders
• Do not mix different batches without testing
• Seal bags completely after each use
• Keep bags off floor (use pallets)
• Clean scoops and equipment between powder changes

Health, Safety & Environment

Product Safety Classification

• Hazard Rating: Non-hazardous material
• Toxicity: Non-toxic (powder form)
• Flammability: Combustible dust (follow dust explosion prevention)
• Reactivity: Stable under normal conditions

Personal Protective Equipment

Minimum PPE Requirements:
- Respiratory Protection: N95 or P95 dust mask
- Eye Protection: Safety glasses or goggles
- Skin Protection: Long sleeves recommended (optional gloves)
- Footwear: Non-slip safety shoes

Workplace Safety

• Ventilation: Adequate spray booth ventilation (prevent dust accumulation)
• Dust Explosion Prevention: Ground all equipment, avoid dust clouds
• Housekeeping: Regular cleaning to prevent dust buildup
• Fire Prevention: No smoking, no open flames in spray area

First Aid Measures

• Inhalation: Move to fresh air, seek medical attention if symptoms persist
• Eye Contact: Flush with water for 15 minutes, seek medical attention
• Skin Contact: Wash with soap and water
• Ingestion: Rinse mouth, drink water, seek medical attention

Environmental Responsibility

• Zero VOC: No volatile organic compounds
• Recyclable Overspray: Overspray can be recovered and reused
• No Hazardous Waste: Cured coating is non-hazardous
• Energy Efficiency: Lower cure temperatures save energy

Certifications & Standards Compliance

Quality Management Certification

• ISO 9001:2015: Quality Management System
• Annual third-party audits
• Continuous process improvement
• Customer satisfaction monitoring

Product Performance Standards

Tested and compliant with Chinese national standards:
- GB/T 1732-1993: Impact Resistance Test
- GB/T 9286-1998: Cross-cut Adhesion Test
- GB/T 6742-1986: Flexibility (Bend Test)
- GB/T 6739-1996: Pencil Hardness Test
- GB/T 1771-1991: Salt Spray Corrosion Test
- GB/T 1740-1979: Weather Resistance Test

Fire Protection System Compatibility

• Compatible with ASTM F1476 (grooved fittings for fire protection)
• Compatible with UL listed grooved fittings
• Suitable for FM approved systems
• NFPA 13 compliant fire sprinkler systems

Environmental Compliance

• RoHS Directive 2011/65/EU: Restriction of Hazardous Substances
• REACH: Registration, Evaluation, Authorization of Chemicals (EU)
• Lead-free, cadmium-free, chromium VI-free formulation

Why Choose DAMEI for Grooved Fitting Coating?

Industry Expertise

18 years specializing in powder coatings for industrial pipe fittings. We understand the unique challenges of coating complex geometries and the performance requirements of fire protection and HVAC systems.

Proven Track Record

Our coatings protect millions of grooved fittings installed in:
- High-rise building fire sprinkler systems
- Industrial plant piping networks
- Hospital and school HVAC systems
- Data center fire protection
- Commercial building plumbing

Technical Innovation

Continuous R&D investment to improve:
- Faraday cage penetration for better recess coverage
- Corrosion resistance formulations
- Production efficiency (faster cure, better flow)
- Color consistency and durability

Quality Raw Materials

Sourcing from world leaders:
- DSM (Netherlands): Premium polyester resins
- Allnex (Belgium): Specialty coating resins
- Clariant (Switzerland): High-performance pigments
- BASF (Germany): Anticorrosive additives

Large-Scale Capacity with Flexibility

• Annual Capacity: 7,000 tons total production
• Dedicated Fire Protection Red: Always in stock
• Fast Turnaround: Emergency orders accommodated
• Flexible MOQ: Small batch orders accepted

Comprehensive Support Services

• Pre-Sales: Application consulting, color matching
• During Sales: Order tracking, quality documentation
• After-Sales: Technical troubleshooting, application training
• On-Site Support: Available for large projects

Request Free Sample & Technical Consultation

What We Provide FREE:

✓ Grooved fitting powder coating samples (fire protection red or custom color)
✓ Complete Technical Data Sheet (TDS)
✓ Material Safety Data Sheet (MSDS/SDS)
✓ Certificate of Analysis (COA) with test data
✓ Application guideline documentation
✓ Color matching service (from your sample)
✓ Competitive pricing quotation

How to Get Started:

1. Contact Us with your fitting specifications
2. Specify Requirements: Color, finish, quantity
3. Receive Sample: 5 kg sample shipped within 3-5 days
4. Test on Your Fittings: Evaluate coverage, adhesion, corrosion resistance
5. Place Order: Receive competitive pricing and lead time

Contact DAMEI Powder Coating:
- 📧 Email: [your-email]@dameipc.com
- 📱 Phone/WhatsApp: +86-536-8382688
- 🏭 Factory Address: No. 1788 Weichang Road, Lebushan Ecological Economic Development Zone, Weicheng District, Weifang, Shandong, China
- 🌐 Website: www.dameipc.com
- ⏰ Business Hours: Monday-Saturday, 8:00-18:00 (GMT+8)

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Frequently Asked Questions

Q: Why is special powder coating important for grooved fittings?

A: Grooved fittings have complex geometries with deep recesses (gasket grooves, bolt holes) that standard powders cannot adequately penetrate. Our specialized formula ensures complete coverage even in Faraday cage areas, preventing corrosion initiation at uncoated spots. Additionally, fittings undergo mechanical stress during installation, requiring coatings with exceptional adhesion and flexibility.

Q: What is the difference between your fire protection red and standard red powder?

A: Our fire protection red uses premium UV-resistant pigments to minimize fading and maintain bright color for easy system identification during inspections. It also has enhanced corrosion resistance for long-term water exposure and is formulated to be compatible with EPDM gaskets. Standard red may fade quickly and lack the corrosion protection needed for 10+ year service life.

Q: Can this coating be used on galvanized grooved fittings?

A: Yes, with proper surface preparation. Galvanized fittings should be treated with zinc phosphate or a galvanized metal pretreatment to ensure good adhesion. Some fitting manufacturers prefer non-galvanized fittings with high-quality powder coating as a more cost-effective corrosion protection method.

Q: What is your minimum order quantity for fire protection red?

A: Fire protection red is a stock color with MOQ of only 200 kg (8 boxes). This accommodates smaller fitting manufacturers and allows for economical inventory management. Custom red shades require 200 kg minimum order.

Q: How do I ensure good coating coverage in the gasket groove?

A: Key factors: (1) Use lower voltage (50-70 KV) for Faraday cage penetration, (2) Apply from multiple angles, (3) Use closer gun distance (10-15 cm) for recesses, (4) Multiple thin passes rather than one thick coat, (5) Verify with post-cure visual inspection and adhesion testing.

Q: Is this coating suitable for underground fire sprinkler systems?

A: Yes, our grooved fitting powder coating provides excellent protection for underground installations. Salt spray resistance >1000 hours and water immersion resistance make it suitable for buried service. However, for extreme soil conditions (highly acidic, high salt), consider additional protective measures like cathodic protection or pipe wrapping.

Q: Can you provide certification documentation for fire marshal inspections?

A: Yes, we provide complete documentation including Certificate of Analysis, Technical Data Sheet, MSDS, and test reports showing compliance with GB/T standards. We can also provide material composition declaration and RoHS compliance certificates as needed for inspections.

Q: What causes coating to peel off after installation, and how can it be prevented?

A: Main causes: (1) Inadequate surface preparation (oil residue, poor phosphating), (2) Under-curing, (3) Excessive installation stress (over-tightening bolts). Prevention: Ensure thorough degreasing and quality phosphating, verify complete cure, and train installers on proper torque specifications. DAMEI coating with proper application has excellent installation stress resistance.

Q: Do you offer color matching for specific fire department or building code requirements?

A: Yes, we offer precise color matching services. Send us a color sample (Pantone code, RAL code, or physical sample) and we'll formulate a matching powder. Some municipalities require specific red shades - we can match these exactly with batch-to-batch consistency.

Case Studies & Applications

Major Fire Sprinkler System Installation

Project: 50-story commercial tower fire protection system
Fittings: 5,000+ grooved couplings, tees, elbows
Coating: DAMEI Fire Protection Red (RAL 3000)
Result: Passed all fire marshal inspections, excellent corrosion resistance after 3 years, no coating failures reported

HVAC Piping Network

Project: Large hospital HVAC system retrofit
Fittings: 8,000+ grooved fittings (2"-12" diameter)
Coating: DAMEI Black powder coating (RAL 9005)
Result: Complete coverage even in complex fittings, no corrosion in humid mechanical rooms, reduced maintenance costs

Industrial Process Piping

Project: Chemical plant process water system
Fittings: Grooved ductile iron fittings
Coating: Custom chemical-resistant formulation
Result: Superior performance vs. liquid coating, faster installation, 5+ years with no coating degradation

Last Updated: 2025 | Product specifications subject to continuous improvement

DAMEI Powder Coating - Protecting Critical Fire Protection & Industrial Piping Systems Since 2007