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FRP Grating - Chemical Resistance and Resin Selection
What each resin system code means, which resin family it belongs to, and how it performs against 322 chemical media.
7 sections - 5 tables - 341 data points
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GT-CHEM-RESIST
| Rev
1.0
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Important - read first
This document is provided for selection guidance only. Values are nominal and subject to manufacturing tolerance. Chemical resistance and load data depend on the exact medium, concentration, temperature and support conditions of your application. Confirm the final specification with us before ordering.
Selection guidance for choosing a resin system for a corrosive environment. Ratings are given for our vinyl ester and isophthalic polyester systems at room temperature and at elevated temperature.
Contents
- 1 . Our resin system codes
- 2 . How our codes work
- 3 . What each code means
- 4 . How to read the ratings
- 5 . Chemical resistance data - 322 media
- 6 . What the data shows
- 7 . How to specify
1 . Our resin system codes
Our resin systems are our own formulation. The base resin is one component of it: we choose the resin chemistry, then tune the remaining components to reach the required flame class and chemical performance. Supplier and grade details are not published, and the formulation is not tied to a single source, so the parameters below hold whichever source the raw material comes from.
Resin systems
| Our code | Base resin | ASTM E84 flame spread | Oxygen index | Specified for |
|---|---|---|---|---|
| VEFR-25 | Vinyl ester | 25 max | 28 min | Severe acids and alkalis; heavy-duty chemical service |
| VEFR-10 | Vinyl epoxy resin | 10 max | 35 min | As VEFR-25 where flame resistance also matters |
| IFR-25 | Isophthalic polyester | 25 max | 28 min | General industrial service, moderate chemical duty |
| IFGR-30 | Isophthalic polyester, food grade formulation | 30 max | 26 | Food processing areas |
| OFR-25 | Orthophthalic polyester | 25 max | 28 min | Water, sea water and neutral salts |
| OFR | Orthophthalic polyester | not rated | - | Non flame-retardant applications |
| MP-5 | Phenolic | 5 max | typically 80 | Maximum flame resistance and low smoke |
ASTM E84 flame spread is the number in the code: a lower figure means the material spreads flame less. A rating of 25 or less is the threshold normally specified as Class 1, and VEFR-25, IFR-25 and OFR-25 all meet it. Oxygen index is a separate measure of ignitability; oxygen index figures are typical values unless a test report is supplied.
2 . How our codes work
The code carries three pieces of information: the base resin chemistry, the flame class, and - where it applies - the food grade formulation.
- A lower ASTM E84 flame spread figure is better. MP-5 at 5 is our highest flame performance; VEFR-10 at 10 is next; the -25 systems meet the Class 1 threshold of 25.
- VEFR-25 and VEFR-10 have the same chemical resistance. They differ in flame class only, so choose between them on the fire requirement, not on the chemistry.
- The code is ours and does not change when the raw material source changes. That is the point of it: you specify a performance, not a supplier.
Reading a code
| Part of the code | Meaning |
|---|---|
| OFR / IFR / VEFR | Base resin chemistry: orthophthalic polyester, isophthalic polyester, or vinyl ester. OFR-25 and OFR differ only in flame class. |
| IFGR | Isophthalic polyester, food grade formulation. |
| MP | Phenolic. |
| The number | ASTM E84 flame spread index. Lower is better. 25 or less is the threshold normally specified as Class 1. |
| No number | No flame rating claimed for that system. |
3 . What each code means
The code identifies the base resin chemistry and the flame class. It is our own reference: it stays the same whichever supplier the raw material comes from, so a code on a quotation or a panel marking tells you what the product will do without depending on a particular source.
- The base resin chemistry, not the brand, is what determines chemical resistance. That is why the ratings in this document are given against the chemistry named above.
- The same code can be produced from more than one source. We hold the parameters, not the source.
- Our formulation is not only resin. Flame class, surface finish and mechanical performance come from the full mix, which we control.
- IFGR-30 states a food grade formulation. Where a market requires food contact certification, tell us before ordering so we can confirm what documentation is available.
Vinyl ester systems - the corrosion workhorse
| Our code | Base resin | Specified for |
|---|---|---|
| VEFR-25 | Vinyl ester | Standard heavy-duty chemical service. Given for acid, alkali, salt, organic solvent and bleaching media. Start here for severe chemical duty. ASTM E84 flame spread 25 max. |
| VEFR-10 | Vinyl epoxy resin | Same chemical resistance as VEFR-25, with a higher flame class: ASTM E84 flame spread 10 max against 25, and oxygen index 35 min against 28. |
Polyester and phenolic systems
| Our code | Base resin | Specified for |
|---|---|---|
| IFR-25 | Isophthalic polyester | Moderate chemical duty: dilute hydrochloric and sulphuric acid, phosphoric acid, general industrial service. ASTM E84 flame spread 25 max. This is the family rated as Isophthalic in the data table below. |
| IFGR-30 | Isophthalic polyester, food grade formulation | Food processing areas. ASTM E84 flame spread 30 max, oxygen index 26. |
| OFR-25 | Orthophthalic polyester | Water, sea water and neutral salts. ASTM E84 flame spread 25 max. Not rated in the data table below: it is not recommended for the acids, alkalis and oxidisers where isophthalic is already limited. |
| OFR | Orthophthalic polyester, no flame rating | Non flame-retardant applications where no flame class is specified. |
| MP-5 | Phenolic | Maximum flame resistance with very low smoke: ASTM E84 flame spread 5 max. Chosen for fire-critical areas such as tunnels, offshore and enclosed spaces. Chemical resistance is moderate and limited by alkali, so check the chemistry separately. |
4 . How to read the ratings
- R - recommended for the stated medium.
- NR - not recommended. Shown in the warning colour in the table.
- A number instead of R or NR is the temperature in Fahrenheit at which the resin was tested or evaluated. It is not necessarily the maximum service temperature.
- R.T. means room temperature, below 38°C (100°F). The elevated columns are 65°C (150°F) and 71°C (160°F).
5 . Chemical resistance data - 322 media
Ratings for molded FRP grating. Compare the room temperature and elevated temperature columns before specifying: many media rated R at room temperature are NR when hot.
Chemical resistance by medium
| Chemical medium | Vinyl Ester R.T. | Vinyl Ester 71°C | Isophthalic R.T. | Isophthalic 65°C |
|---|---|---|---|---|
| 0.025% Epsom Salts | R | R | R | R |
| 0.8% Fluoboric Acid | R | 120 | NR | NR |
| 10% Ferric Sulfate | R | R | NR | NR |
| 10.5% Copper | R | R | NR | NR |
| 15% CaCl2 | R | R | NR | NR |
| 30% Ferric Chloride | R | R | NR | NR |
| 5% Benzene in Kerosene | R | NR | NR | NR |
| 6% Sodium Cyanide | R | R | NR | NR |
| 7% Potassium Cyanide | R | R | NR | NR |
| 7% Tin | R | 120 | NR | NR |
| 8-8-8 Fertilizer | R | R | R | R |
| 9% Hydrochloric | R | R | NR | NR |
| Acetic Acid 0-25% | R | R | R | 125 |
| Acetic Acid 25-50% | R | R | R | NR |
| Acetic Anhydride | NR | NR | NR | NR |
| Acetone | NR | NR | NR | NR |
| Acrylonitrile | NR | NR | NR | NR |
| Alcohol, Butyl | R | NR | NR | NR |
| Alcohol, Ethyl 10% | R | 120 | NR | NR |
| Alcohol, Ethyl 100% | NR | NR | NR | NR |
| Alcohol, Isopropyl 10% | R | 150 | NR | NR |
| Alcohol, Isopropyl 100% | R | NR | NR | NR |
| Alcohol, Methyl 10% | R | NR | NR | NR |
| Alcohol, Methyl 100% | NR | NR | NR | NR |
| Alcohol, Methyl Isobutyl | R | 120 | NR | NR |
| Alcohol, Secondary Butyl | R | 150 | NR | NR |
| Alum | R | 120 | NR | NR |
| Aluminum Chloride | R | 120 | R | NR |
| Aluminum Hydroxide 5% | R | 120 | NR | NR |
| Aluminum Nitrate | R | 120 | NR | NR |
| Aluminum Potassium Sulfate | R | 120 | NR | NR |
| Ammonia, Aqueous 0-10% | R | NR | NR | NR |
| Ammonia, Gas | R | NR | NR | NR |
| Ammonium Bicarbonate | R | 120 | R | NR |
| Ammonium Bisulfite | R | 120 | R | NR |
| Ammonium Carbonate 10% | R | 120 | NR | NR |
| Ammonium Citrate | R | 120 | R | NR |
| Ammonium Hydroxide 10% | R | 120 | NR | NR |
| Ammonium Hydroxide 20% | R | NR | NR | NR |
| Ammonium Hydroxide 5% | R | 120 | NR | NR |
| Ammonium Nitrate | R | R | R | R |
| Ammonium Persulfate | R | 120 | NR | NR |
| Ammonium Phosphate | R | 120 | NR | NR |
| Ammonium Sulfate | R | R | R | R |
| Arsenious Acid | R | R | R | NR |
| Barium Acetate | R | R | NR | NR |
| Barium Carbonate | R | R | R | NR |
| Barium Chloride | R | R | R | 120 |
| Barium Hydroxide | R | 120 | NR | NR |
| Barium Sulfate | R | R | R | R |
| Barium Sulfide | R | R | NR | NR |
| Beer | R | 120 | R | NR |
| Benzene | NR | NR | NR | NR |
| Benzene Sulfonic Acid 30% | R | R | NR | NR |
| Benzoic Acid | R | R | R | NR |
| Benzyl Alcohol | R | NR | NR | NR |
| Benzyl Chloride | NR | NR | NR | NR |
| Butyl Acetate | NR | NR | NR | NR |
| Butylene Glycol | R | R | R | R |
| Butyric Acid 0-50% | R | R | R | NR |
| Cadmium Chloride | R | R | R | NR |
| Calcium Bisulfite | R | R | R | R |
| Calcium Chlorate | R | R | R | R |
| Calcium Chloride | R | R | R | R |
| Calcium Hydroxide | NR | NR | NR | NR |
| Calcium Hypochlorite | R | 120 | NR | NR |
| Calcium Nitrate | R | R | R | R |
| Calcium Sulfate | R | R | R | R |
| Calcium Sulfite | R | R | R | R |
| Caprylic Acid | R | R | R | NR |
| Carbon Dioxide | R | R | R | R |
| Carbon Disulfide | NR | NR | NR | NR |
| Carbon Methyl Cellulose | R | 120 | NR | NR |
| Carbon Monoxide | R | R | R | R |
| Carbon Tetrachloride | NR | NR | NR | NR |
| Carbonic Acid | R | R | R | 120 |
| Castor Oil | R | R | R | R |
| Chlorinated Wax | R | R | NR | NR |
| Chlorine Dioxide, Wet Gas | R | R | NR | NR |
| Chlorine Dioxide/Air | R | R | NR | NR |
| Chlorine, Dry Gas | R | R | NR | NR |
| Chlorine, Liquid | NR | NR | NR | NR |
| Chlorine, Water | R | NR | NR | NR |
| Chlorine, Wet Gas | R | R | NR | NR |
| Chloro-Phenyl Types | NR | NR | NR | NR |
| Chloroacetic Acid 0-50% | R | NR | NR | NR |
| Chlorobenzene | NR | NR | NR | NR |
| Chloroform | NR | NR | NR | NR |
| Chlorosulfonic Acid | NR | NR | NR | NR |
| Chromic Acid | NR | NR | NR | NR |
| Chromium Sulfate | R | R | R | R |
| Citric Acid | R | R | R | R |
| Coconut Oil | R | R | R | NR |
| Concrete | R | R | NR | NR |
| Copper Chloride | R | R | R | R |
| Copper Cyanide | R | R | R | NR |
| Copper Fluoride | R | R | NR | NR |
| Copper Nitrate | R | R | R | R |
| Copper Sulfate | R | R | R | R |
| Corn Oil | R | R | R | R |
| Corn Starch-Slurry | R | R | R | R |
| Corn Sugar | R | R | R | R |
| Cottonseed Oil | R | R | R | R |
| Crude Oil, Sour | R | R | R | NR |
| Crude Oil, Sweet | R | R | R | NR |
| Cyclohexane | R | 120 | NR | NR |
| Deionized | R | R | R | R |
| Demineralized | R | R | R | R |
| Detergents, Sulfonated | R | R | R | NR |
| Di-Ammonium Phosphate | R | R | NR | NR |
| Dibromophenol | NR | NR | NR | NR |
| Dibutyl Ether | R | NR | NR | NR |
| Dichloro Benzene | NR | NR | NR | NR |
| Dichloroethylene | NR | NR | NR | NR |
| Diesel Fuel | R | R | R | 120 |
| Diethylene Glycol | R | R | R | R |
| Dimenthyl Phthalate | R | R | NR | NR |
| Dioctyl Phthalate | R | R | NR | NR |
| Dipropylene Glycol | R | R | R | R |
| Distilled | R | R | R | R |
| Dodecyl Alcohol | R | R | NR | NR |
| Esters, Fatty Acids | R | R | R | R |
| Ethyl Acetate | NR | NR | NR | NR |
| Ethyl Benzene | NR | NR | NR | NR |
| Ethyl Ether | NR | NR | NR | NR |
| Ethylene Dichloride | NR | NR | NR | NR |
| Ethylene Glycol | R | R | R | R |
| Fatty Acids | R | R | R | R |
| Ferric Chloride | R | R | R | R |
| Ferric Nitrate | R | R | R | R |
| Ferric Sulfate | R | R | R | R |
| Ferrous Chloride | R | R | R | R |
| Ferrous Nitrate | R | R | R | R |
| Ferrous Sulfate | R | R | R | R |
| Flue Gas | R | R | NR | NR |
| Formaldehyde | R | R | R | NR |
| Formic Acid 10% | R | R | R | NR |
| Fresh | R | R | R | R |
| Fuel Oil | R | R | R | NR |
| Gas, Natural | R | R | R | NR |
| Gasoline, Auto | R | 120 | R | NR |
| Gasoline, Aviation | R | 120 | R | NR |
| Gasoline, Ethyl | R | 120 | R | NR |
| Gasoline, Sour | R | 120 | R | NR |
| Glucose | R | R | R | R |
| Glycerine | R | R | R | R |
| Glycol, Propylene | R | R | R | R |
| Glycolic Acid 70% | R | R | R | NR |
| Glyconic Acid | R | R | R | NR |
| Heptane | R | R | R | NR |
| Hexalene Glycol | R | R | R | R |
| Hexane | R | R | R | NR |
| Hydraulic Fluid | R | R | R | NR |
| Hydrobromic Acid 0-25% | R | R | R | NR |
| Hydrochloric Acid 0-37% | R | R | NR | NR |
| Hydrocyanic Acid | R | R | R | NR |
| Hydrofluoric Acid | NR | NR | NR | NR |
| Hydrogen Bromide, Wet Gas | R | R | NR | NR |
| Hydrogen Chloride, Dry Gas | R | R | NR | NR |
| Hydrogen Chloride, Wet Gas | R | 120 | NR | NR |
| Hydrogen Fluoride, Vapor | NR | NR | NR | NR |
| Hydrogen Peroxide 35% | R | 120 | R | 120 |
| Hydrogen Sulfide Dry | R | R | R | 120 |
| Hydrogen Sulfide, Aqueous | R | R | NR | NR |
| Hydrosulfite Bleach | R | 120 | NR | NR |
| Hypochlorous Acid 0-10% | R | 120 | NR | NR |
| Isopropyl Amine | R | NR | NR | NR |
| Isopropyl Palmitate | R | R | R | R |
| Jet Fuel | R | R | NR | NR |
| Kerosene | R | R | R | 120 |
| Lactic Acid | R | R | R | R |
| Lauric Acid | R | R | NR | NR |
| Lauroyl Chloride | R | R | NR | NR |
| Lead Acetate | R | R | R | R |
| Lead Chloride | R | R | R | R |
| Lead Nitrate | R | R | R | R |
| Levulinic Acid | R | R | NR | NR |
| Linseed Oil | R | R | NR | NR |
| Lithium Bromide | R | R | R | R |
| Lithium Sulfate | R | R | R | R |
| Magnesium Bisulfite | R | R | NR | NR |
| Magnesium Chloride | R | R | R | R |
| Magnesium Hydroxide | R | 140 | NR | NR |
| Magnesium Nitrate | R | R | R | R |
| Magnesium Sulfate | R | R | R | R |
| Maleic Acid | R | R | NR | NR |
| Mercuric Chloride | R | R | R | R |
| Mercurous Chloride | R | R | R | R |
| Methyl Ethyl Ketone | NR | NR | NR | NR |
| Methyl Isobutyl Carbitol | NR | NR | NR | NR |
| Methyl Isobutyl Ketone | NR | NR | NR | NR |
| Methyl Styrene | NR | NR | NR | NR |
| Methylene Chloride | NR | NR | NR | NR |
| Mineral Oil Types | R | R | R | R |
| Mineral Oils | R | R | R | R |
| Molybdenum Disulfide | R | R | NR | NR |
| Monochloric Acetic Acid | NR | NR | NR | NR |
| Monoethanolamine | NR | NR | NR | NR |
| Motor Oil | R | R | R | R |
| Myristic Acid | R | R | NR | NR |
| Naphtha | R | R | R | R |
| Naphthalene | R | R | R | NR |
| Nickel Chloride | R | R | R | R |
| Nickel Nitrate | R | R | R | R |
| Nickel Sulfate | R | R | R | R |
| Nitric Acid 0-5% | R | R | R | NR |
| Nitric Acid 15% | R | 120 | NR | NR |
| Nitric Acid Fumes | NR | NR | NR | NR |
| Nitrobenzene | NR | NR | NR | NR |
| O-Benzoyl Benzoic Acid | R | R | NR | NR |
| Octanoic Acid | R | R | R | NR |
| Oil, Sour Crude | R | R | R | R |
| Oil, Sweet Crude | R | R | R | R |
| Oleic Acid | R | R | R | R |
| Oleum (Fuming Sulfuric) | NR | NR | NR | NR |
| Olive Oil | R | R | R | R |
| Oxalic Acid | R | R | R | R |
| Ozone | NR | NR | NR | NR |
| Phenol | NR | NR | NR | NR |
| Phenol Sulfonic Acid | NR | NR | NR | NR |
| Phosphoric Acid 85% | R | R | R | R |
| Phosphoric Acid Fumes | R | R | R | R |
| Phosphorous Pentoxide | R | R | R | NR |
| Phosphorous Trichloride | NR | NR | NR | NR |
| Phthalic Acid | R | R | R | R |
| Picric Acid, Alcoholic | R | R | R | NR |
| Polyvinyl Acetate Latex | R | R | R | NR |
| Polyvinyl Alcohol | R | NR | R | NR |
| Potassium Aluminum Sulfate | R | R | R | R |
| Potassium Bicarbonate | R | R | R | NR |
| Potassium Bromide | R | R | NR | NR |
| Potassium Chloride | R | R | R | R |
| Potassium Dichromate | R | 140 | NR | NR |
| Potassium Ferricyanide | R | R | R | R |
| Potassium Ferrocyanide | R | R | R | R |
| Potassium Nitrate | R | R | R | R |
| Potassium Permanganate | R | 140 | NR | NR |
| Potassium Persulfate | R | R | R | NR |
| Potassium Sulfate | R | R | R | R |
| Propionic Acid 1-50% | R | 120 | NR | NR |
| Propylene Glycol | R | R | R | R |
| Pulp Paper Mill Effluent | R | R | NR | NR |
| Pyridine | NR | NR | NR | NR |
| Salicylic Acid | R | 140 | NR | NR |
| Salt | R | R | R | R |
| Sea | R | R | R | R |
| Sebacic Acid | R | R | NR | NR |
| Selenious Acid | R | R | NR | NR |
| Silver Nitrate | R | R | R | R |
| Sodium Acetate | R | R | R | NR |
| Sodium Benzoate | R | R | R | NR |
| Sodium Bicarbonate | R | R | NR | NR |
| Sodium Bifluoride | R | 120 | R | NR |
| Sodium Bisulfate | R | R | R | R |
| Sodium Bisulfite | R | R | R | R |
| Sodium Bromate | R | 140 | R | NR |
| Sodium Bromide | R | R | R | R |
| Sodium Chlorate | R | R | R | NR |
| Sodium Chloride | R | R | R | R |
| Sodium Chlorite 25% | R | R | R | NR |
| Sodium Chromate | R | R | NR | NR |
| Sodium Cyanide | R | R | R | NR |
| Sodium Di-Phosphate | R | R | R | R |
| Sodium Dichromate | R | R | NR | NR |
| Sodium Ferricyanide | R | R | R | R |
| Sodium Fluoride | R | 120 | NR | NR |
| Sodium Fluoro Silicate | R | 120 | NR | NR |
| Sodium Hexametaphosphates | R | NR | NR | NR |
| Sodium Hydrosulfide | R | R | R | NR |
| Sodium Hydroxide 0-5% | R | 150 | NR | NR |
| Sodium Hydroxide 5-50% | R | 120 | NR | NR |
| Sodium Hypochlorite (5% bleach) | R | 120 | NR | NR |
| Sodium Lauryl Sulfate | R | R | R | R |
| Sodium Mono-Phosphate | R | R | R | R |
| Sodium Nitrate | R | R | R | R |
| Sodium Silicate | R | R | R | R |
| Sodium Sulfate | R | R | R | R |
| Sodium Sulfide | R | R | R | R |
| Sodium Sulfite | R | R | R | NR |
| Sodium Tetra Borate | R | R | R | R |
| Sodium Thiocyanate | R | R | NR | NR |
| Sodium Thiosulfate | R | R | R | NR |
| Sodium Tripolyphosphate | R | R | R | NR |
| Sodium Xylene Sulfonate | R | R | R | NR |
| Soya Oil | R | R | R | R |
| Stannic Chloride | R | R | R | R |
| Stannous Chloride | R | R | R | R |
| Stearic Acid | R | R | R | R |
| Styrene | NR | NR | NR | NR |
| Sugar, Beet and Cane Liquor | R | R | R | NR |
| Sugar, Sucrose | R | R | R | R |
| Sulfamic Acid | R | R | R | NR |
| Sulfanilic Acid 50% | R | R | NR | NR |
| Sulfated Detergents | R | R | R | NR |
| Sulfur Dioxide, Dry or Wet | R | R | NR | NR |
| Sulfur, Trioxide/Air | R | R | NR | NR |
| Sulfuric Acid 0-30% | R | R | R | R |
| Sulfuric Acid 30-50% | R | R | NR | NR |
| Sulfuric Acid 50-70% | R | NR | NR | NR |
| Sulfurous Acid 10% | R | NR | NR | NR |
| Tall Oil | R | 150 | R | NR |
| Tannic Acid | R | 120 | R | NR |
| Tartaric Acid | R | R | R | R |
| Thionyl Chloride | NR | NR | NR | NR |
| Toluene | NR | NR | NR | NR |
| Toluene Sulfonic Acid | R | R | NR | NR |
| Trichlorethylene | NR | NR | NR | NR |
| Trichloro Acetic Acid | NR | NR | NR | NR |
| Trichloropenol | NR | NR | NR | NR |
| Tricresyl Phosphate | R | 120 | NR | NR |
| Tridecylbenzene Sulfonate | R | R | R | NR |
| Trisodium Phosphate | R | R | R | NR |
| Turpentine | R | NR | NR | NR |
| Urea | R | 140 | R | NR |
| Vegetable Oils | R | R | R | R |
| Vinegar | R | R | R | R |
| Vinyl Acetate | NR | NR | NR | NR |
| White Liquor (Pulp Mill) | R | R | NR | NR |
| Xylene | NR | NR | NR | NR |
| Zinc Chlorate | R | R | R | R |
| Zinc Nitrate | R | R | R | R |
| Zinc Sulfate | R | R | R | R |
6 . What the data shows
- Vinyl ester is recommended for 273 of the 322 media listed; isophthalic for 173.
- There are 100 media where vinyl ester is recommended and isophthalic is not - strong alkalis, hypochlorites and other oxidisers, and concentrated acids. These cases decide the resin.
- 173 media are handled by both, mostly neutral salts, water and dilute solutions.
- 49 media are not recommended in either system: solvents and concentrated sulphuric acid fall here.
- Temperature matters as much as chemistry. Compare the two columns before specifying.
7 . How to specify
Send us the following and we will confirm a resin system and grade against the supplier data.
- Chemical name, or full mixture composition
- Concentration in per cent
- Normal and maximum service temperature
- Continuous immersion, or occasional splash
- Any abrasive solids present
- The standard or market approval you must satisfy