Powder Coating for Electrostatic Spray Application on Cold Surfaces MT R4-ES HJ601R
WA：+86 132 6275 2056
WEB: std-coatings.com
Product Description
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.
Key Characteristics & Technical Performance
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.
Typical Applications
MT R4‑ES HJ601R is widely used across industries where corrosion resistance and long service life are critical:
Valves and fittingsfor potable water distribution systems
Gas line components and connectorssubject to environmental exposure
Cast iron valve bodies and steel flanges/fittings
Municipal infrastructure, such as hydrants and pipeline junctions
Industrial fluid handling systemsrequiring hygienic coatings
Because of itsdrinking water approvals, this powder is also well suited to coatings inside potable water systems where hygiene and safety are mandated.
Production & Application Benefits
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 issolvent‑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.
Application Guidance
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 approximately190 °C object temperature for 10 minutesto ensure full cross‑linking and optimal performance.
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