Sodium Bisulfite (NaHSO3, CAS 7631-90-5) is usually supplied as a 38% to 40% yellowish solution with a sulfur dioxide odor and a specific gravity of about 1.33 to 1.48. It is used for dechlorination of water and wastewater, as an oxygen scavenger, to reduce hexavalent chromium, as a food preservative, and in pulp, textile and photographic processing. Tanks should be closed and vented, since SO2 off-gasses. Use the compatibility ratings to choose the right tank resin, fittings and gaskets.
Safety data: Sodium Bisulfite Safety Data Sheet (SDS) – INEOS Calabrian
Polypropylene is the most economical tank material for Sodium Bisulfite, rated Excellent. PVDF (Kynar®) and HDPE are also rated Good or better. Avoid aluminum hardware. Rated Fair (contact us before use): nylon tanks.
How Sodium Bisulfite works with the plastics used to make our storage tanks.
| Material | Rating |
|---|---|
| HDPE | |
| Polypropylene | |
| Nylon | |
| PVDF (Kynar®) |
How Sodium Bisulfite works with the plastics used for tank fittings.
| Material | Rating |
|---|---|
| HDPE | |
| PVC | |
| CPVC | |
| Polypropylene | |
| PVDF |
How Sodium Bisulfite works with gasket and O-ring materials.
| Material | Rating |
|---|---|
| Buna-N | |
| EPDM | |
| Viton® |
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