Assurance guide
GRP Chemical Resistance Guide
Use this searchable guide to screen GRP resin suitability by chemical, concentration and maximum reference temperature. The data below is aligned to GRP Express internal chemical resistance datasheets for isophthalic polyester resin and the vinyl ester addendum.
Project verification required: chemical compatibility depends on concentration, operating temperature, exposure duration, cleaning regime, ventilation, loading, additives and mixed chemicals. The figures are reference test temperatures, not guaranteed maximum service temperatures. Confirm the final resin system for the specific project before ordering.
Isophthalic versus vinyl ester resin
Standard GRP resin route for many wet, salt, mild chemical and general industrial environments. Where a row is marked LS, the source identifies limited service life and the project should be reviewed before use.
Specialist route for selected aggressive chemicals and lower-temperature acid exposure. The SharePoint vinyl ester datasheet is an addendum, so it lists only the chemicals covered by that addendum.
Search chemical resistance data
Search by chemical name, resin, concentration, Celsius, Fahrenheit, NR or LS. Temperature is shown as Celsius first, with Fahrenheit in brackets.
Showing all source rows.
| Chemical environment | Resin | Concentration | Max reference temp | Guidance |
|---|---|---|---|---|
| Acetic Acid | Isophthalic | 50% | 66°C (151°F) | Use as reference |
| Acetic Acid | Isophthalic | 1%, 10%, 15%, 25% | 71°C (160°F) | Use as reference |
| Acetic Acid, glacial | Isophthalic | 100% | N/R | Not recommended |
| Acetone | Isophthalic | 100% | N/R | Not recommended |
| Aluminium Chloride | Isophthalic | 100% | 77°C (171°F) | Use as reference |
| Aluminium Sulfate | Isophthalic | 100% | 82°C (180°F) | Use as reference |
| Ammonium Bicarbonate | Isophthalic | 20% | 49°C (120°F) | Use as reference |
| Ammonium Bicarbonate | Isophthalic | 15% | 54°C (129°F) | Use as reference |
| Ammonium Carbonate | Isophthalic | 10%, 30% | N/R | Not recommended |
| Ammonium Hydroxide | Isophthalic | 1% | 32°C (90°F) | LS – limited service life |
| Ammonium Hydroxide | Isophthalic | 5%, 10%, 20%, 28%, 30% | N/R | Not recommended |
| Benzene | Isophthalic | 1%, 100% | 32°C (90°F) | LS – limited service life |
| Benzene Sulfonic Acid | Isophthalic | 30% | 66°C (151°F) | Use as reference |
| Calcium Hydroxide | Isophthalic | 25% | 71°C (160°F) | Use as reference |
| Calcium Hydroxide | Isophthalic | 1%, 15% | 82°C (180°F) | Use as reference |
| Carbon Dioxide, wet acidic | Isophthalic | 100% | 93°C (199°F) | Use as reference |
| Carbon Tetrachloride | Isophthalic | 100% | 32°C (90°F) | LS – limited service life |
| Carbon Tetrachloride, vapour | Isophthalic | 100% | 32°C (90°F) | Use as reference |
| Chlorine Dioxide, fumes | Isophthalic | 5% | 32°C (90°F) | Use as reference |
| Chromic Acid | Isophthalic | 1%, 5%, 10%, 20% | 49°C (120°F) | Use as reference |
| Chromic Acid | Isophthalic | 30%, 40%, 50% | N/R | Not recommended |
| Chromic Acid | Vinyl ester | 5% | 38°C (100°F) | Use as reference |
| Chromic Acid | Vinyl ester | 10% | 16°C (61°F) | Use as reference |
| Chromic Acid | Vinyl ester | 20% | 10°C (50°F) | Use as reference |
| Chromic Acid | Vinyl ester | 30% | -4°C (25°F) | Short life at room temperature |
| Chromic Acid | Vinyl ester | 40% | N/R | Not recommended |
| Diesel Fuel | Isophthalic | 100% | 80°C (176°F) | Use as reference |
| Ethyl Acetate | Isophthalic | 1%, 100% | N/R | Not recommended |
| Ethyl Alcohol | Isophthalic | 50% | 32°C (90°F) | Use as reference |
| Ethyl Alcohol | Isophthalic | 100% | N/R | Not recommended |
| Glycerine | Isophthalic | 100% | 82°C (180°F) | Use as reference |
| Heptane, normal | Isophthalic | 100% | 93°C (199°F) | Use as reference |
| Hydrobromic Acid | Isophthalic | 48% | 66°C (151°F) | Use as reference |
| Hydrobromic Acid | Isophthalic | 1%, 18%, 25% | 71°C (160°F) | Use as reference |
| Hydrochloric Acid | Isophthalic | 1%, 5%, 10%, 15% | 71°C (160°F) | Use as reference |
| Hydrochloric Acid | Isophthalic | 20%, 25% | 66°C (151°F) | LS – limited service life |
| Hydrochloric Acid | Isophthalic | 32% | 52°C (126°F) | Use as reference |
| Hydrochloric Acid | Isophthalic | 36% | 38°C (100°F) | Use as reference |
| Hydrochloric Acid | Isophthalic | 37% | 32°C (90°F) | LS – limited service life |
| Hydrochloric Acid | Vinyl ester | 1-20% | 27°C (81°F) | Use as reference |
| Hydrochloric Acid | Vinyl ester | 20-25% | 27°C (81°F) | Use as reference |
| Hydrochloric Acid | Vinyl ester | 26-32% | 18°C (64°F) | Use as reference |
| Hydrochloric Acid | Vinyl ester | 33-36% | 10°C (50°F) | Use as reference |
| Hydrochloric Acid | Vinyl ester | 37% | 4°C (39°F) | Use as reference |
| Hydrofluoric Acid | Isophthalic | 1% | 38°C (100°F) | Use as reference |
| Hydrofluoric Acid | Isophthalic | 10% | 27°C (81°F) | LS – limited service life |
| Hydrofluoric Acid | Isophthalic | 15% | N/R | Not recommended |
| Hydrofluoric Acid | Vinyl ester | 10% | 18°C (64°F) | Use as reference |
| Hydrofluoric Acid | Vinyl ester | 20% | 4°C (39°F) | Use as reference |
| Hydrofluoric Acid | Vinyl ester | 47% | N/R | Not recommended |
| Hydrogen Peroxide | Isophthalic | 5% | 66°C (151°F) | Use as reference |
| Hydrogen Peroxide | Isophthalic | 50% | N/R | Not recommended |
| Hypochlorous Acid | Isophthalic | 20% | 32°C (90°F) | Use as reference |
| Hypochlorous Acid | Isophthalic | 10% | 41°C (106°F) | Use as reference |
| Lactic Acid | Isophthalic | 100% | 71°C (160°F) | Use as reference |
| Lead Acetate | Isophthalic | 100% | 71°C (160°F) | Use as reference |
| Nickel Sulphate | Vinyl ester | All | 38°C (100°F) | Use as reference |
| Nitric Acid | Isophthalic | 5% | 71°C (160°F) | Use as reference |
| Nitric Acid | Isophthalic | 10% | 32°C (90°F) | Use as reference |
| Nitric Acid | Isophthalic | 20% | N/R | Not recommended |
| Nitric Acid | Vinyl ester | 31-35% | -4°C (25°F) | Use as reference |
| Nitric Acid | Vinyl ester | 36-40%, 70% | N/R | Not recommended |
| Perchloric Acid | Isophthalic | 5% | N/R | Not recommended |
| Phosphoric Acid | Isophthalic | 100% | 32°C (90°F) | Use as reference |
| Phosphoric Acid | Isophthalic | 85% | 71°C (160°F) | Use as reference |
| Sea Water | Isophthalic | 100% | 82°C (180°F) | Use as reference |
| Silver Nitrate | Isophthalic | 100% | 82°C (180°F) | Use as reference |
| Sodium Hydroxide | Isophthalic | 0.5% | 38°C (100°F) | Use as reference |
| Sodium Hydroxide | Isophthalic | 1% | 32°C (90°F) | LS – limited service life |
| Sodium Hydroxide | Isophthalic | 5% | N/R | Not recommended |
| Sodium Hydroxide | Vinyl ester | 5% | 21°C (70°F) | Use as reference |
| Sodium Hypochlorite, stable | Isophthalic | 2%, 5.25% | 49°C (120°F) | Use as reference |
| Sodium Hypochlorite, stable | Isophthalic | 10% | 38°C (100°F) | Use as reference |
| Sodium Hypochlorite, stable | Isophthalic | 15% | N/R | Not recommended |
| Stannic Chloride | Isophthalic | 100% | 82°C (180°F) | Use as reference |
| Styrene | Isophthalic | 100% | N/R | Not recommended |
| Sulfuric Acid | Isophthalic | 1%, 5% | 82°C (180°F) | Use as reference |
| Sulfuric Acid | Isophthalic | 25% | 66°C (151°F) | Use as reference |
| Sulfuric Acid | Isophthalic | 50% | 49°C (120°F) | Use as reference |
| Sulfuric Acid | Isophthalic | 70% | N/R | Not recommended |
| Sulfuric Acid | Vinyl ester | 25%, 50% | 38°C (100°F) | Use as reference |
| Sulfuric Acid | Vinyl ester | 60% | 27°C (81°F) | Use as reference |
| Sulfuric Acid | Vinyl ester | 70% | 21°C (70°F) | Use as reference |
| Sulfuric Acid | Vinyl ester | 75%, 80% | 4°C (39°F) | Use as reference |
| Sulfuric Acid | Vinyl ester | >80% | N/R | Not recommended |
| Vinegar | Isophthalic | 100% | 82°C (180°F) | Use as reference |
| Water, city | Isophthalic | 100% | 71°C (160°F) | Use as reference |
| Water, distilled | Isophthalic | 100% | 71°C (160°F) | Use as reference |
| Water, demineralised | Isophthalic | 100% | 82°C (180°F) | Use as reference |
| Zinc Sulfate | Isophthalic | 100% | 82°C (180°F) | Use as reference |
Key: N/R = not recommended. LS = limited service life. Vinyl ester rows are from the separate vinyl ester addendum; absence of a vinyl ester row means the chemical was not listed in that addendum, not that it has been approved. Obvious source spelling issues have been corrected for customer-facing clarity.
How to use this guide
Start with the closest listed concentration. If the environment is a blend, vapour, splash, immersion or cleaning cycle, request review before specification.
The value is the upper temperature at which the resin has been tested in the source datasheet. It is not an automatic service guarantee.
Resin selection may affect GRP grating, stair treads, pultruded profiles, fixings and fabricated assemblies differently because cut edges, drainage and loading vary.
Record chemicals, concentration, operating and maximum temperatures, exposure duration, cleaning agents and whether the contact is splash, vapour, immersion or continuous.
GRP chemical resistance FAQs
Can this table be used as a final chemical compatibility guarantee?
No. It is an initial resin-selection guide. Project conditions must be verified before the resin system is specified, quoted or ordered.
When should vinyl ester resin be considered?
Vinyl ester should be considered where the environment is more aggressive, where isophthalic resin is not recommended or limited service, or where a project calls for a specialist chemical-resistant resin route.
What does LS mean?
LS means limited service life in the internal source datasheet. Treat any LS row as requiring project-specific technical review before use.
What does N/R mean?
N/R means not recommended for that resin route under the stated reference condition. It does not automatically rule out every GRP option, but it does mean the project needs technical review.
What information is needed for resin verification?
Provide chemical name, concentration, normal and maximum temperatures, exposure duration, drainage, cleaning chemicals, product type and whether exposure is splash, vapour, immersion or continuous.
Apply resin guidance to products
Use chemical-resistance checks before choosing grating, profiles or project support.
The table is a guide, not a final approval. Link the exposure back to the product family, resin route, temperature, concentration and project verification before ordering.