Industrial wet paint system
A spray-applied liquid paint system: anti-corrosion epoxy primer and UV-resistant polyurethane topcoat. The standard external protection for bodies made by Emsal.
- THICKNESS
- ≥ 160 µm
- APPLICATION
- In-house at Emsal
- TEMPERATURE
- −20 … +120 °C
- COST
Surface preparation
Surface preparation: blasting to Sa 2½ (ISO 8501-1) or mechanical cleaning to St 3; then primer and topcoat.
System and thickness
| SYSTEM | Thickness µm | Coats | Curing / process | Note |
|---|---|---|---|---|
| Epoxy primer (zinc phosphate) | 80 | 1 | Air drying | Anti-corrosion |
| Polyurethane topcoat | 80 | 1 | Air drying | Colour and UV resistance |
| Total (NDFT) | ≥ 160 | 2 | — | Two-coat system for C3 environments |
Thickness as dry film (µm). Emsal standard; binding values are set by the order specification.
Service temperature
The epoxy-polyurethane system is typically good up to 120 °C in dry heat. Higher temperatures (external surface of steam lines) require silicone-based heat-resistant paint.
Media suitability GENERAL TREND
Emsal assessment. The final choice is made from corrosion tables, taking concentration, temperature, chloride content and flow velocity into account.
Strengths and weaknesses
Strengths
- Can be applied to any geometry and to large parts
- Free choice of colour (RAL)
- Easy touch-up and repair
- The polyurethane topcoat does not fade under UV
Weaknesses
- Thickness and quality depend on the applicator
- Inadequate for immersed and buried service
- Requires drying time
Manufacturing and use
- ECONOMY
- Low to medium.
- MANUFACTURING METHODS
- Blasting or mechanical cleaning · Airless spraying · Air drying
- TYPICAL VALVE PARTS
- Body (external) · Cover · Bracket
Emsal practice
- APPLIED BY
- In-house at Emsal
- APPLIED TO
- Carbon steel and cast iron bodies made by Emsal other than wafer check valves (strainers, sight flow indicators, brackets…)
- COLOUR
- Carbon steel and GGG40 / GGG50: traffic blue (RAL 5017) · GG25: red (RAL 3020)
- SYSTEM
- Epoxy primer 80 µm + polyurethane topcoat 80 µm · total ≥ 160 µm
Used in 2 Emsal products
- 313Externally pressurized expansion jointCoatings (iron-carbon parts)
- 314V-flex expansion jointCoatings (iron-carbon parts)
Source: ISO 12944-5. Values compiled and verified by Emsal Vana; for binding values, refer to the current edition of the standard and the material certificate.