Sodium Hydroxide: chemical resistance of ASP floors
How each ASP epoxy and polyurethane flooring product performed when fully immersed in sodium hydroxide, from ASP's chemical resistance guides (December 2022).
Summary5% at 20°C: excellent for ASP-primeStd, ASP-coat500, ASP-coat1000, ASP-coatSL, ASP-screedPTS, ASP-screedSTB, ASP-coatWBE, ASP-creteSL, ASP-creteMD, ASP-creteRT, ASP-creteVS and ASP-coatPU.
20% at 20°C: excellent for ASP-primeStd, ASP-coat500, ASP-coat1000, ASP-coatSL, ASP-screedPTS, ASP-screedSTB, ASP-coatWBE, ASP-creteSL, ASP-creteMD, ASP-creteRT, ASP-creteVS and ASP-coatPU.
50% at 20°C: excellent for ASP-primeStd, ASP-coat500, ASP-coat1000, ASP-coatSL, ASP-screedPTS, ASP-screedSTB, ASP-coatWBE, ASP-creteSL, ASP-creteMD, ASP-creteRT, ASP-creteVS and ASP-coatPU.
50% at 60°C: no product rated excellent; not resistant: ASP-primeStd, ASP-coat500, ASP-coat1000, ASP-coatSL, ASP-screedPTS, ASP-screedSTB, ASP-coatWBE, ASP-creteSL, ASP-creteMD, ASP-creteRT, ASP-creteVS and ASP-coatPU.
| Product | 5% at 20°C | 20% at 20°C | 50% at 20°C | 50% at 60°C |
|---|---|---|---|---|
| Epoxy products | ||||
| ASP-primeStd | ||||
| ASP-primeDamp | ||||
| ASP-coat500 | ||||
| ASP-coat1000 | ||||
| ASP-coatSL | ||||
| ASP-screedHTS | ||||
| ASP-screedPTS | ||||
| ASP-screedSTB | ||||
| ASP-repair | – | – | – | – |
| ASP-epoxyCove | – | – | – | – |
| ASP-epoxyGrout | – | – | – | – |
| ASP-coatWBE | ||||
| Polyurethane products | ||||
| ASP-creteSL | ||||
| ASP-creteMD | ||||
| ASP-creteRT | ||||
| ASP-creteVS | ||||
| ASP-creteCoat | ||||
| ASP-uvCoat | ||||
| ASP-coatPU | ||||
| ASP-trafficID | ||||
Ratings come from 30 × 30 mm samples cast at each product's prescribed thickness, cured for 7 days and fully submerged at 20–25°C. On a real floor, a spill only touches the surface, so performance is usually better. Elevated temperatures accelerate chemical attack. How to read these ratings.
Questions about sodium hydroxide
Which ASP floors resist sodium hydroxide (5% at 20°C)?
Rated 5 (excellent, no significant deterioration after long-term contact): ASP-primeStd, ASP-coat500, ASP-coat1000, ASP-coatSL, ASP-screedPTS, ASP-screedSTB, ASP-coatWBE, ASP-creteSL, ASP-creteMD, ASP-creteRT, ASP-creteVS and ASP-coatPU.
Which ASP floors resist sodium hydroxide (20% at 20°C)?
Rated 5 (excellent, no significant deterioration after long-term contact): ASP-primeStd, ASP-coat500, ASP-coat1000, ASP-coatSL, ASP-screedPTS, ASP-screedSTB, ASP-coatWBE, ASP-creteSL, ASP-creteMD, ASP-creteRT, ASP-creteVS and ASP-coatPU.
Which ASP floors resist sodium hydroxide (50% at 20°C)?
Rated 5 (excellent, no significant deterioration after long-term contact): ASP-primeStd, ASP-coat500, ASP-coat1000, ASP-coatSL, ASP-screedPTS, ASP-screedSTB, ASP-coatWBE, ASP-creteSL, ASP-creteMD, ASP-creteRT, ASP-creteVS and ASP-coatPU.
Which ASP floors resist sodium hydroxide (50% at 60°C)?
Not resistant (0): ASP-primeStd, ASP-coat500, ASP-coat1000, ASP-coatSL, ASP-screedPTS, ASP-screedSTB, ASP-coatWBE, ASP-creteSL, ASP-creteMD, ASP-creteRT, ASP-creteVS and ASP-coatPU.
Is epoxy flooring resistant to sodium hydroxide?
Some ASP epoxy systems are rated excellent for sodium hydroxide at 5% at 20°C, 20% at 20°C or 50% at 20°C. Check the exact concentration and temperature in the table, as ratings change with both.
Is polyurethane flooring resistant to sodium hydroxide?
Some ASP polyurethane systems are rated excellent for sodium hydroxide at 5% at 20°C, 20% at 20°C or 50% at 20°C.