Coatings and surface protection
Anti-corrosion primer
Anti-corrosion primer
A pigmented primer that protects steel against rusting (zinc phosphate or iron oxide). The Emsal standard for large wafer check valve bodies.
- THICKNESS
- ≥ 80 µm
- APPLICATION
- In-house at Emsal
- TEMPERATURE
- −20 … +100 °C
- COST
Surface preparation
Surface preparation: abrasive blasting or mechanical cleaning (St 3). It is a primer on its own; a topcoat is recommended for parts exposed outdoors for long periods.
System and thickness
| SYSTEM | Thickness µm | Coats | Curing / process | Note |
|---|---|---|---|---|
| Anti-corrosion primer | 40 | 1 | Air drying | Per coat |
| Total | ≥ 80 | 2 | — | Topcoat recommended outdoors |
Thickness as dry film (µm). Emsal standard; binding values are set by the order specification.
Service temperature
−20 °C+100 °C−200−1000100200300400500600700800
Typically up to 100 °C.
Media suitability GENERAL TREND
Indoor (C1–C2)
Urban, industrial (C3–C4)
Marine, coastal (C5)
Immersion in water (Im1)
Buried (Im3)
High temperature
Abrasion, impact
UV, sunlight
Emsal assessment. The final choice is made from corrosion tables, taking concentration, temperature, chloride content and flow velocity into account.
Strengths and weaknesses
Strengths
- The most economical protection
- Easy to apply to large parts
- Good base for subsequent coats
Weaknesses
- Limited life on its own; a topcoat is needed outdoors
- Inadequate for immersion and marine environments
Manufacturing and use
- ECONOMY
- Very low.
- MANUFACTURING METHODS
- Mechanical cleaning · Brush, roller or spray
- TYPICAL VALVE PARTS
- Body (large sizes)
Emsal practice
- APPLIED BY
- In-house at Emsal
- APPLIED TO
- Wafer check valve, carbon steel body, DN 450 and above
- SYSTEM
- 2 coats × 40 µm · total ≥ 80 µm
Used in 2 Emsal products
- 001Wafer check valveCoatings (iron-carbon parts)
- 005Short pattern swing check valveCoatings (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.