Chemical Resistance
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:
- No Effect - No detectable change in the material surface.
- Good - Slight detectable change in color or gloss but no change in function or life of the surface.
- Fair - Slight surface etching or severer staining. Clearly discernible change in color or gloss but no significant impairment of surface life or function.
- Poor - Pitting, cratering or erosion of the surface. Obvious and significant deterioration. Objectionable change in appearance due to dis-coloration .
| Chemical Tested* | Method | Black Onyx |
| Amyl Acetone | A | 0 |
| Ethyl Acetate | A | 0 |
| Acetic Acid 98% | B | 0 |
| Acetone | A | 1 |
| Acid Dichromate 5% | B | 0 |
| Butyl Alcohol | A | 0 |
| Ethyl Alcohol | A | 0 |
| Methyl Alcohol | A | 1 |
| Ammonium Hydroxide, 28% | B | 0 |
| Benzene | A | 1 |
| Carbon Tetrachloride | A | 0 |
| Chloroform | A | 1 |
| Chromic Acid 60% | B | 2 |
| Cresol | A | 0 |
| Dichloro Acetic Acid | A | 0 |
| Dimethylformamide | A | 0 |
| Dioxane | A | 0 |
| Ethyl Ether | A | 0 |
| Formaldehyde 37% | A | 0 |
| Formic Acid 90% | B | 0 |
| Furfural | A | 1 |
| Gasoline | A | 0 |
| Hydrochloric Acid 37% | B | 0 |
| Hydrofluoric Acid 48% | B | 2 |
| Hydrogen Peroxide 28% | B | 0 |
| Tincture of Iodine | B | 0 |
| Methyl Ethyl Ketone | A | 0 |
| Methylene Chloride | A | 0 |
| Mono Chlorobenzene | A | 0 |
| Napthalene | A | 0 |
| Nitric Acid 20% | B | 0 |
| Nitric Acid 30% | B | 1 |
| Nitric Acid 70% | B | 1 |
| Phenol 90% | A | 0 |
| Phosphoric Acid 85% | B | 1 |
| Silver Nitrate, Saturated | B | 0 |
| Sodium Hydroxide 10% | B | 1 |
| Sodium Hydroxide 20% | B | 1 |
| Sodium Hydroxide 40% | B | 1 |
| Sodium Hydroxide Flake | B | 1 |
| Sodium Sulfide, Saturated | B | 2 |
| Sulfuric Acid 25% | B | 1 |
| Sulfuric Acid 85% | B | 2 |
| Sulfuric Acid 96% | B | 3 |
| Sulfuric Acid 85%, and Nitric Acid 70%, equal parts | B | 3 |
| Toluene | A | 1 |
| Trichlorethylene | A | 0 |
| Xylene | A | 0 |
| Zinc Chloride, Saturated | B | 0 |
*Independent Results from Universal Laboratory, Inc., 1726 Commerce St., Garland, TX