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Epoxy Chemical Resistance


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Method A

For volatile chemicals. A cotton ball, saturated with the test chemical, was placed in a one ounce bottle (10mm x 75mm test tube or similar container). The container was inverted on the test material surface for a period of 24 hours. Temperature of test: 23° +/-2° C (73° +/-4° F). This method was used for the organic solvents.

Method B

For non-volatile chemicals. Five drops (1/4cc) of the test chemical were placed on the test material surface. The chemical was covered with a watch glass (25mm) for a period of 24 hours. Temperature of test: 23° +/-2° C (73° +/-4° F). This method was used for all chemicals listed below other than the solvents.

Evaluation

After 24 hour exposure, exposed areas were washed with water, then a detergent solution and finally with isopropyl alcohol. Materials were then rinsed with distilled water and dried with a cloth.

Samples are numerically rated as follows:

  1. No Effect - No detectable change in the material surface.
  2. Excellent - Slight detectable change in color or gloss but no change in function or life of the surface.
  3. Good - A clearly discernible change in color or gloss but no significant impairment of surface life or function.
  4. Fair - Objectionable change in appearance due to dis-coloration or etch, possibly resulting in deterioration of function over an extended period of time.
  5. Failure - Pitting, cratering or erosion of the surface. Obvious and significant deterioration.
Inorganic Acids - Corrosive Black Platinum Pearl Green Blue
Chromic Acid (CrO3) 40% 2 2 2 1 3
Hydrochloric Acid (HCl) 10% 1 1 1 1 1
Hydrochloric Acid (HCl) 37% 1 1 1 1 1
Nitric Acid (HNO3) 40% 1 1 1 1 1
Nitric Acid (HNO3) 70% 2 2 2 2 2
Sulfuric Acid (H2SO4) 40% 1 1 1 1 1
Sulfuric Acid (H2SO4) 96% 5 5 5 5 5

Organic Acids - Corrosive Black Platinum Pearl Green Blue
Acetic Acid (CH3CO2H) -5% 2 2 2 1 1
Acetic Acid (CH3CO2H) -Glacial 2 1 1 1 1
Citric Acid (C6H8O7) -1% Oleic 1 1 1 1 1
Acid (C18H34O2) Phenol 1 1 1 1 1
Solution (C6H5OH) -5% 1 1 1 1 1

Alkaline Solutions - Corrosive Black Platinum Pearl Green Blue
Ammonium Hydroxide (NH4OH) -10% 1 1 1 1 1
Potassium Hydroxide (KOH) -15% 1 1 1 1 1
Sodium Carbonate Sol (Na2CO3) -20% 1 1 1 1 1
Sodium Hydroxide Sol (NaOH) -60% 1 1 2 1 2
Sodium Hypochlorite Sol (NaOCl) -4% 1 1 1 1 1

Organic Solvents Black Platinum Pearl Green Blue
Acetone (CH3COCH3) 3 2 2 2 2
Benzene (C6H6) 2 2 2 2 2
Carbon Tetrachloride (CCl4) 1 1 1 1 1
Diethyl Ether (CH3CH2OCH2CH3) 1 1 1 1 1
Dimethyl Formamide (HCON[CH3]2) 1 1 1 1 1
Ethyl Acetate (CH3CO2C2H5) 2 2 2 2 2
Ethyl Alcohol (CH3CH2OH) -95% 1 1 1 2 1
Ethylene Dichloride (ClCH2CH2Cl) 1 1 1 1 1
Heptane (CH3[CH2]5CH3) 1 1 1 1 1
Isooctane (C8H18) 1 1 1 1 1
KerosenE 1 1 2 1 1
Methyl Alcohol (CH3OH) 1 1 1 1 1
Sodium Hypochlorite Sol (NaOCl) -4% 1 1 1 1 1

Organic Compounds Black Platinum Pearl Green Blue
Aniline (C6H5NH2) 2 1 1 2 1
Mineral Oil 1 1 1 1 1
Olive Oil 1 1 1 1 1
Soap Solution -1% 1 1 1 1 1
Transformer Oil 1 1 1 1 1
Turpentine 2 1 1 1 2