Method · Chemical & corrosion resistance
Coatings and FRP linings for tanks, secondary containment, chemical storage and process floors. We select the system by the chemical in contact — not just "waterproofing".
Coatings without fibre — epoxy, polyurethane or polyurea — that protect concrete and steel from the chemical in contact.
Tank protection, secondary containment, chemical storage and process floors.
The system is chosen by the chemical in contact. The most severe service, mainly strong acids, takes an FRP lining (resin + glass fibre) instead.
Layers of resin reinforced with glass-fibre mat, built up ply by ply. The heavy-duty system for the most severe acid service.
Treatment basins and chemical floors with strong acids and other severe chemicals.
The resin (polyester, epoxy or vinylester) is chosen from the maker's chemical-resistance chart for the chemical, concentration and temperature
Layers (built up from the bottom)
Usually two coats — the data sheet sets the number and thickness, measured as we go.
The first protective coat, chosen by the chemical in contact.
Soaks into the substrate and makes the coats above bond firmly.
Concrete is ground and repaired; steel is blasted to remove rust and give the coating a profile to grip.
The final resin coat on top.
A thin fibre mat laid over the laminate and wetted out with resin to reinforce the surface.
Glass-fibre-reinforced resin built up ply by ply for strength and chemical resistance.
Soaks into the substrate and bonds the layers above.
Weak surface ground off, cracks and voids filled to a sound, flat base.
The figure shows one typical build-up. The actual layers are decided after we see the site.
Tank steel is blasted to remove rust and give the coating a profile to grip; concrete is ground and repaired.
Wet and dry film thickness are checked as we go.
On steel, a spark (holiday) test finds pinholes; an adhesion test confirms the bond before the tank goes back into service.
We select the system by the chemical in contact — not just "waterproofing". Vinylester is a resin used within FRP, not a separate material.
| Resin | Chemical resistance | Type |
|---|---|---|
| Epoxy | Rigid; standard–high chemical (Novolac for high) | A. Coating (no fiber) |
| Polyurethane | Flexible, weather & UV resistant | A. Coating (no fiber) |
| Polyurea | Fast cure, high tensile — tanks, secondary containment | A. Coating (no fiber) |
| Polyester FRP | Medium — economical | B. FRP Lining (resin + glass fiber) |
| Epoxy FRP | High — standard heavy-duty | B. FRP Lining (resin + glass fiber) |
| Vinylester FRP | Highest — the most severe service, mainly strong acids | B. FRP Lining (resin + glass fiber) |
Also with this method:EGAT Wang Noi Power Plant · EGAT Bang Pakong Power Plant · Green Spot · Lenzing T3 · Panjapol Paper · Win Chance Food · PTT Global Chemical · PTT GSP7
The area, the substrate preparation (blasting steel, grinding and repairing concrete), the chemical and its temperature, the system and number of coats, and how long the tank or area can be out of service. Send the chemical, drawings and photos on LINE.
By how aggressive the chemical is. Coatings without fibre — epoxy (Novolac for high resistance), polyurethane for weather, polyurea for tanks and containment — cover general to high duty. For more severe service, mainly strong acids, an FRP lining of resin and glass fibre is used — polyester, epoxy or vinylester, chosen from the maker's chemical-resistance chart.
Wet and dry film thickness are checked as we go. A spark (holiday) test finds pinholes, and an adhesion test confirms the bond before the tank goes back into service.
Send the chemical and its temperature, the area and a few photos. We check the site and propose the system that fits.
Only want materials? psw-chemical.com ↗TEL +66 2 552 6468 · sales@passawarn.com