Tannic Acid (C76H52O46, CAS 1401-55-4) is a yellow-brown plant polyphenol that dissolves readily in water to form a mildly acidic, astringent solution. It is used in leather tanning, wine and beer clarification, dye mordants, inks, corrosion inhibitors (rust converters) and oilfield drilling fluids. Tannic acid darkens when it contacts iron, so non-metallic tanks are preferred. Use the compatibility ratings to choose the right tank resin, fittings and gaskets.
HDPE is the most economical tank material for Tannic Acid, rated Excellent. Polypropylene and PVDF (Kynar®) are also rated Good or better. Rated Fair (contact us before use): nylon tanks and aluminum hardware.
How Tannic Acid works with the plastics used to make our storage tanks.
| Material | Rating |
|---|---|
| HDPE | |
| Polypropylene | |
| Nylon | |
| PVDF (Kynar®) |
How Tannic Acid works with the plastics used for tank fittings.
| Material | Rating |
|---|---|
| HDPE | |
| PVC | |
| CPVC | |
| Polypropylene | |
| PVDF |
How Tannic Acid works with gasket and O-ring materials.
| Material | Rating |
|---|---|
| Buna-N | |
| EPDM | |
| Viton® |
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