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4237 Epoxy Anti-Corrosion Coating Under the Insulation Layer
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4237 Epoxy Anti-Corrosion Coating Under the Insulation Layer
Product Description
Product Introduction
4237 is a two-component, alkylamine‑cured epoxy thick‑film coating that, upon curing, forms a coating with excellent mechanical strength. It is recommended for use as an anti-corrosion under‑insulation coating.
Application areas
This product is typically used for corrosion protection of carbon steel surfaces beneath thermal insulation in new construction, maintenance, and repair applications (CUI). It can achieve a high film thickness in a single coat, delivering long‑term corrosion resistance. The paint contains needle‑shaped functional fillers that significantly enhance crack‑resistance. This product offers a broad service temperature range, with a maximum temperature rating of 275°C.
Product Information
Appearance: Aluminum gray
Solid content: 67±2%
Mixing ratio: 3:1 (by volume)
Mixed-use period: 2 hours (20°C)
Complete curing: 7 days
Recommended dry film thickness: 150 μm (corresponding to a wet film thickness of 162 μm)
Theoretical coverage (150 µm): 4.5 m²/L
Specific gravity: 1.4 kg/L
Flash point: above 35°C
VOC content: 306 g/L
Construction conditions
New steel: sandblasted to Sa2.5 grade, with a surface roughness of Medium (G) (ISO 8503-2).
Steel coated with shop primer: Apply light blast cleaning or grind rusted areas to St3 grade using an elastic abrasive wheel.
The substrate temperature must be at least 3°C above the dew point, and the ambient relative humidity must be below 85%.
Use this product only under conditions where application and curing can proceed normally at temperatures above –10°C; the application surface must be clean and dry.
Painting method
Application Methods: Airless Spraying / Air-Assisted Spraying / Brushing / Roller Coating
Thinner 103 Epoxy Thinner
Dilution ratio: 0–5% (by weight of the paint; the actual amount added can be adjusted according to on-site application methods)
Nozzle diameter: 0.43–0.64 mm
Ejection pressure: 20–25 MPa
Drying time |
||||
Temperature |
0℃ |
10℃ |
20℃ |
30 °C |
Surface dry |
8 hours |
6 hours |
3 hours |
2 hours |
Brute force |
16 hours |
12 hours |
6 hours |
4 hours |
Recoating interval |
|||||
Subsequent coating |
Temperature |
0℃ |
10 °C |
20 °C |
30 °C |
Epoxy |
Shortest |
8 hours |
4 hours |
2 hours |
1 hour |
Longest |
90 days |
60 days |
45 days |
30 days |
|
Polyurethane |
Shortest |
12 hours |
8 hours |
4 hours |
2 hours |
Longest |
7 days |
5 days |
72 hours |
72 hours |
|
Note: If the maximum recoat interval is exceeded, the coated surface must be sanded to create a roughened texture before applying the subsequent coat.
Paint film thickness/dilution
Non‑recommended film thicknesses may be used depending on the application and area; this will affect the coverage rate as well as drying time and recoat intervals. The standard dry film thickness per coat is 75–200 microns.
Packaging Specifications
Component A: 13.5 liters, Component B: 4.5 liters
Shelf life
Base material: 36 months, Curing agent: 12 months
Safety measures
See the company’s Material Safety Data Sheet (MSDS).
Disclaimer: The information and data provided herein are based on our testing and practical experience, and are intended as a guide for application. For applications carried out under conditions beyond our control, we warrant only the quality of the paint itself; we assume no responsibility for any other issues. We reserve the right to revise this instruction manual in light of ongoing product improvements.
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