Documentation - Molded Grating - Chemical Resistance
3.4 Chemical Resistance
Resin Selection for Chemical Environments
The performance and durability of FRP molded grating depend heavily on
the compatibility of the selected resin system with the intended chemical
environment. Exposure to acids, alkalis, solvents, salts, fuels, cleaning
agents, and process chemicals can significantly affect long-term service
life and safety.
This Chemical Resistance Guide compares the behavior of orthophthalic
polyester (ORTHO), isophthalic polyester (ISO), and vinyl ester (VE)
resin systems across a broad range of chemical environments and
concentrations. The listed values represent maximum recommended service
temperatures in degrees Celsius.
The data is derived from laboratory testing and industry references and
is intended as a practical screening tool for engineers, specifiers, and
procurement teams. Actual performance may vary with concentration,
temperature, exposure duration, contamination, process cycling, loading,
fabrication, installation, and environmental conditions.
Resin-System Summary
Not Offered by Fiberr
Orthophthalic Polyester (ORTHO)
A general-purpose polyester resin included in the table for
comparison. It typically provides lower chemical resistance and
reduced long-term durability relative to ISO and VE resin systems.
Isophthalic Polyester (ISO)
Fiberr’s standard resin system for general industrial applications.
ISO provides good chemical resistance, mechanical performance, and
cost efficiency in moderate service environments.
Vinyl Ester (VE)
Fiberr’s higher-performance resin system for aggressive chemicals,
elevated temperatures, strong acids, solvents, wastewater,
processing facilities, and other demanding corrosive environments.
Selection requirement: Resin suitability should be
evaluated using the exact chemical, concentration, operating temperature,
exposure duration, immersion or splash condition, cleaning process, and
expected mechanical loading. Contact Fiberr for review when service
conditions are severe, mixed, intermittent, or not listed.
Table Interpretation
Numeric Value
Maximum recommended service temperature in degrees Celsius for the
listed resin, chemical, and concentration.
*
Not recommended or insufficient resistance for the listed condition.
—
Data not available or no recommendation established.
Molded Grating Chemical Resistance Guide
Table 23: Molded Grating Chemical Resistance
Chemical Environment
% Concentration
ORTHO (Not Offered by Fiberr)
ISO
VE
Acetic Acid
0–25
25
35
95
Acetic Acid
25–50
*
25
80
Acetone
10
20
*
*
Aluminum Chloride
Saturated
45
50
100
Ammonium Chloride
>0.5
45
50
100
Ammonium Citrate
>0.5
40
45
65
Ammonium Hydroxide
0.5–5
*
25
80
Ammonium Nitrate
Saturated
40
45
90
Ammonium Sulfate
Saturated
45
50
100
Barium Chloride
>0.5
50
45
100
Beer
>0.5
*
55
50
Benzene
100
*
*
*
Benzene
Vapor
*
*
*
Benzoic Acid
Saturated
50
50
100
Benzyl Alcohol
100
25
25
*
Boric Acid
>0.5
50
50
90
Cadmium Cyanide
All
*
*
80
Calcium Bisulfite
>0.5
40
45
90
Calcium Hydroxide
100
20
35
80
Calcium Nitrate
>0.5
50
50
100
Calcium Oxide
All
*
*
80
Calcium Sulphate
All
50
50
95
Carbon Tetrachloride
100
20
25
*
Carbon Dioxide (Gas)
All
50
50
65
Carbonic Acid
Saturated
50
50
80
Carbon Monoxide (Gas)
All
75
70
80
Castor Oil
100
75
70
70
Chloride Water
Saturated
*
25
100
Detergents (Organic)
All
—
—
70
Detergents
Sulfonated
45
45
90
Diesel Fuel
100
35
30
80
Dipropylene Glycol
100
50
55
80
Ethyl Alcohol
10
30
30
50
Ethyl Alcohol
50
20
25
40
Ethyl Alcohol
100
20
25
*
Ethylene Glycol
100
20
35
90
Ferrous Chloride
>0.5
40
45
95
Ferrous Nitrate
>0.5
40
45
95
Ferrous Sulfate
>0.5
40
45
95
Flue Gas (Wet)
All
*
45
90
Fluosilicic Acid
20
*
*
50
Formic Acid
10
25
35
80
Gasoline
100
*
*
45
Glucose
100
—
60
100
Heptane
100
30
25
80
Hydrogen Peroxide
5
—
—
65
Hydrogen Peroxide
30
—
—
40
Hydrogen Sulfide
5
55
60
100
Jet Fuel
100
*
*
*
Kerosene
100
40
30
80
Lactic Acid
All
50
55
100
Magnesium Bicarbonate
All
30
40
80
Magnesium Sulfate
>0.5
45
50
95
Maleic Acid
Saturated
45
45
90
Mercury
100
55
60
100
Methyl Alcohol
40–100
30
25
*
Milk and Milk Products
All
25
28
70
Naphtha, Aromatic
100
30
25
*
Naphthalene
100
45
40
80
Nickel Chloride
>0.5
50
50
90
Nickel Nitrate
>0.5
50
50
90
Nickel Plating
Solution
45
45
80
Nickel Sulfate
>0.5
50
0
90
Nitric Acid
0–5
45
45
65
Nitric Acid
6–10
—
—
—
Nitric Acid
11–20
40
25
50
Nitric Acid
21–29
—
—
—
Nitric Acid
30–35
*
*
40
Nitric Acid
36–40
*
*
*
Oleic Acid
100
50
50
100
Perchloric Acid
10
*
20
65
Perchloric Acid
30
*
*
40
Phosphoric Acid
0.5–85
50
50
90
Phthalic Acid
All
45
45
100
Potassium Carbonate
0–50
*
*
65
Potassium Chloride
>0.5
50
45
90
Potassium Ferricyanide
>0.5
50
45
90
Potassium Hydroxide
0–45
*
*
45
Potassium Permanganate
>0.5
*
*
90
Potassium Sulfate
>0.5
50
45
90
Sodium Hypochlorite
0.5–5.25
*
*
50
Sodium Acetate
>0.5
50
50
100
Sodium Bicarbonate
All
50
50
100
Sodium Bisulfate
>0.5
50
50
100
Sodium Carbonate
All
*
*
70
Sodium Chloride
>0.5
50
50
100
Sodium Chlorite
>0.5
50
50
100
Sodium Ferricyanide
>0.5
50
45
100
Sodium Hydroxide
All
*
*
60
Sodium Sulfate
>0.5
50
45
100
Sodium Sulfide
>0.5
50
50
100
Sodium Thiosulfate
All
45
50
80
Stannous Chloride
>0.5
50
50
100
Styrene
100
*
*
*
Sulfuric Acid
0.5–25
50
60
90
Sulfuric Acid
26–50
60
60
80
Sulfuric Acid
51–70
*
*
80
Sulfuric Acid
>0.5
50
50
*
Tannic Acid
>0.5
50
50
100
Toluene
100
*
*
*
Urea
All
—
—
65
Vegetable Oils
100
40
50
95
Water (Demineralized)
100
45
45
80
Water (Distilled)
100
45
45
80
Water (Deionized)
100
45
45
80
Xylene
100
30
*
25
Zinc Chloride
Saturated
50
50
100
Zinc Sulfate
All
50
50
100
Important: The listed temperatures are general
recommendations and are not guaranteed design limits. Chemical mixtures,
impurities, alternating exposure, pressure, abrasion, elevated loading,
thermal cycling, and sustained immersion may reduce performance. Final
resin selection should be confirmed for the complete service condition.
