HYDROFLUORIC ACID (HF) 70% Chemical Compatibility
70% HYDROFLUORIC ACID is a clear, colorless, corrosive fuming liquid with a sharp, pungent odor. It is 100% soluble in water and is not flammable.
The 70% solution is highly hazardous and needs to be handled and used with rigorous safety precautions. Both liquid and vapor can cause severe burns to all parts of the body. Specialized medical treatment is required for any exposure to this or any grade of HF.
The specific gravity at 70F. is 1.225. Hydrofluoric acid fumes at low temperatures. best practices would be to have a bolted, sealed manway and to vent into a scrubber.
At a glance
PVDF (Kynar®) is the most economical tank material for Hydrofluoric Acid (Hf) 70%, rated Excellent. HDPE is also rated Good or better. Rated Fair (contact us before use): polypropylene tanks; PVC, CPVC and polypropylene fittings; EPDM gaskets.
- Excellent No or minor effect. Recommended.
- Good Slight effect. Generally suitable.
- Fair Moderate effect. Limited or conditional use — contact us.
- Not Recommended Severe effect. Do not use.
- No Data Not tested. Contact us before use.
Tank Resins
How Hydrofluoric Acid (Hf) 70% works with the plastics used to make our storage tanks.
| Material | Rating |
|---|---|
| HDPE | |
| Polypropylene | |
| Nylon | SEVERE EFFECT |
| PVDF (Kynar®) |
Fittings
How Hydrofluoric Acid (Hf) 70% works with the plastics used for tank fittings.
| Material | Rating |
|---|---|
| HDPE | |
| PVC | |
| CPVC | |
| Polypropylene | |
| PVDF |
Gaskets & O-Rings
How Hydrofluoric Acid (Hf) 70% works with gasket and O-ring materials.
| Material | Rating |
|---|---|
| Buna-N | SEVERE EFFECT |
| EPDM | |
| Viton® |