MT R4-ES HJ601R is a high quality thermosetting epoxy powder coating for the corrosion protection of valves and fittings, manufactured from cast iron or steel. The powder coating is applied in one layer on cold surfaces by electrostatic spray application. The adhesion of MT R4-ES HJ601R to the metal substrate provides long term protection of the coated component. It ensures a reliable conservation to the function and value of the parts for the common water and gas distribution network. The applicator benefits from a modern and environmentally friendly process. Drinking water approvals are available.
Unlike many conventional coatings that require substrate preheating, MT R4‑ES HJ601R can be applied directly to cold metal surfaces using standard electrostatic spray systems. This reduces energy consumption and enhances production flexibility while still achieving a strong, uniform film with excellent adhesion and barrier properties.
Powder Properties (Typical):
Binder System: Epoxy resin (thermosetting)
Density: 1.30–1.40 g/cm³ (ISO 8130‑2)
Gel Time at 200 °C: 25–40 sec (modified ISO 8130‑6)
Particle Size Distribution: ~25–40 % < 32 µm; > 98 % < 125 µm (Malvern, ISO 8130‑1)
Storage Stability: 6 months at ≤ 23 °C
Material Properties After Curing:
Color: Blue, approximate RAL 5015
Recommended Film Thickness: 120–220 µm
Flow: Smooth
Gloss (60°): 70–100 gloss units (ISO 2813)
Cross‑cut Adhesion: Gt 0 (DIN EN ISO 2409)
These properties reflect a coating that forms a dense, mechanically resilient film capable of withstanding the rigors of manufacturing, handling, and field service, especially where corrosion protection and durability are essential.
MT R4‑ES HJ601R is widely used across industries where corrosion resistance and long service life are critical:
Valves and fittings for potable water distribution systems
Gas line components and connectors subject to environmental exposure
Cast iron valve bodies and steel flanges/fittings
Municipal infrastructure, such as hydrants and pipeline junctions
Industrial fluid handling systems requiring hygienic coatings
Because of its drinking water approvals, this powder is also well suited to coatings inside potable water systems where hygiene and safety are mandated.
Efficient, Cold Surface Application
MT R4‑ES HJ601R’s ability to be applied on cold surfaces means less energy is required for curing compared with preheated systems, which can lower production costs and simplify coating line requirements.
Cleaner, Environmentally Friendly Process
As a powder coating, it is solvent‑free and virtually VOC‑free, aligning with modern environmental regulations and reducing workplace emissions. It also offers minimal overspray waste and high transfer efficiency.
Strong Adhesion & Mechanical Integrity
The epoxy backbone ensures excellent adhesion to metal substrates, resisting blistering, cracking, and delamination under stress or during transport and installation.
Ensure metal surfaces are clean, dry, and free from oils, rust, and contaminants before coating.
Standard grit blasting to appropriate cleanliness levels (e.g., Sa 2.5) improves adhesion and film performance.
Use corona electrostatic spray equipment for best coverage and efficiency; maintain recommended voltage and airflow settings per your spray system guidelines.
Target a film thickness in the range of 120–220 µm to maximize corrosion protection without risking incomplete cure or poor film formation.
Cure at approximately 190 °C object temperature for 10 minutes to ensure full cross‑linking and optimal performance.
Cold Surface Compatibility: Unlike systems that need preheating, MT R4‑ES HJ601R can be applied directly, facilitating faster production cycles.
Epoxy Barrier Film: The thermoset epoxy matrix provides excellent chemical, humidity, and mechanical resistance compared with many polyester‑only primers.
Drinking Water Safety: Approvals for potable water applications make it suitable for hygienic pipelines and fittings where safety certifications are required.
Minimal Environmental Impact: Powder formulation eliminates solvents and reduces emissions.
1. Can MT R4‑ES HJ601R be applied on preheated surfaces?
No. This specific formulation is designed for cold surface electrostatic application. Preheating is not required and may alter film properties. However, related R4‑ES variants exist for preheated surfaces.
2. Is this coating suitable for potable water pipelines?
Yes. It has available drinking water approvals, indicating suitability for potable water systems when applied and cured correctly.
3. What is the advantage of applying on cold surfaces?
Cold surface application reduces energy usage by eliminating the need to heat the component before coating, simplifying production lines and lowering operational cost.
4. What curing conditions should be used?
A typical cure schedule is 10 min at 190 °C object temperature, which ensures the powder fully cross‑links into a durable thermoset film.
5. How does the epoxy powder protect against corrosion on valves and fittings?
The dense epoxy film acts as a strong chemical and moisture barrier. Coupled with the film thickness (120–220 µm), it limits ingress of corrosive agents, maintaining long‑term substrate protection.
6. Can this powder be over‑coated with UV‑stable topcoats?
Yes. Although epoxy provides excellent corrosion resistance, it is not inherently UV‑stable. A UV‑resistant polyester or polyurethane topcoat can be applied for outdoor exposure.
7. What kinds of surface preparation are recommended?
Thorough surface cleaning and grit blasting (e.g., Sa 2.5 profile) are recommended for optimal adhesion and long‑term corrosion resistance, removing mill scale, rust, and contaminants before coating.
Powder coatings can be categorized by resin system (epoxy, polyester, hybrid, polyurethane), appearance (smooth, texture, hammer, metallic, pearlescent), or performance level (anti-corrosion, heat-resistant, UV-resistant, architectural grade, automotive grade).
Powder coatings offer thousands of colors in gloss, matte, satin, metallic, candy, texture, wrinkle, hammer tone, wood grain, fluorescent, and other custom effects. Special powders can create soft-touch, anti-scratch, anti-fingerprint, or anti-graffiti surfaces.
The process generally includes surface pretreatment (degreasing, phosphating, chromating, sandblasting), drying, electrostatic spraying, curing in an oven, and cooling. A well-controlled pretreatment and curing process ensures strong adhesion and long service life.
Powder coatings are environmentally friendly, solvent-free, and produce minimal waste. They offer excellent corrosion resistance, weather durability, mechanical strength, and uniform film appearance. The coating is tough, impact-resistant, scratch-resistant, and has a long lifespan.
Powder coatings are widely used in appliances, aluminum profiles, architectural components, automotive parts, bicycles, furniture, outdoor equipment, machinery, electrical cabinets, pipeline systems, and general industrial and consumer goods.
Powder coating is a dry finishing technology where finely ground powder is electrostatically sprayed onto a metal or non-metal surface and then cured at high temperature. After curing, the powder melts into a continuous, durable, and decorative coating layer.
Powder coating protects the substrate from corrosion, weathering, chemical attack, and mechanical wear. It also provides decorative appearance with rich colors, gloss levels, textures, and special effects.
In many industrial applications, powder coating outperforms liquid paint. It forms a thicker and tougher coating, resists corrosion and chemicals better, and does not contain VOCs. It also provides excellent consistency and cost-effective mass production.
It is called powder coating because the coating material is a solid powder instead of a liquid paint. The coating is formed by melting and curing powder particles under heat.
Powder coatings include several families depending on resin chemistry:
• Epoxy powders
• Polyester powders
• Epoxy-polyester hybrid powders
• Polyurethane powders
• Acrylic powders
• Fluorocarbon (PVDF) powders
Each type has its own performance features such as corrosion resistance, UV resistance, chemical resistance, outdoor durability, or decorative properties.
Powder coatings are based on thermoset or thermoplastic resins combined with pigments, curing agents, fillers, additives, and in some cases metallic or effect particles. Common substrates include steel, aluminum, galvanized metal, MDF, and certain heat-resistant plastics.
The lifespan depends on powder type, film thickness, application method, pretreatment, and service environment. Indoor coatings can last more than 10–20 years. High-grade outdoor polyester or fluorocarbon powders can last 15–25 years or longer under UV exposure.
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