Formic Acid (HCOOH, CAS 64-18-6) is a clear, colorless liquid with a sharp, pungent odor, a specific gravity of about 1.22 (85% to 99% grades) and a boiling point near 214°F (101°C). It is corrosive and combustible. Formic acid is used in leather tanning, textile dyeing, silage and feed preservation, rubber latex coagulation, de-icing formates and oilfield acidizing. Use the compatibility ratings to choose the right tank resin, fittings and gaskets.
HDPE is the most economical tank material for Formic Acid, rated Excellent. Polypropylene and PVDF (Kynar®) are also rated Good or better. Avoid nylon tanks. Rated Fair (contact us before use): Buna-N and Viton® gaskets.
How Formic Acid works with the plastics used to make our storage tanks.
| Material | Rating |
|---|---|
| HDPE | |
| Polypropylene | |
| Nylon | |
| PVDF (Kynar®) |
How Formic Acid works with the plastics used for tank fittings.
| Material | Rating |
|---|---|
| HDPE | |
| PVC | |
| CPVC | |
| Polypropylene | |
| PVDF |
How Formic Acid works with gasket and O-ring materials.
| Material | Rating |
|---|---|
| Buna-N | |
| EPDM | |
| Viton® |
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