At a glance

Polypropylene is the most economical tank material for Caustic Soda (50%), rated Excellent. Nylon, PVDF (Kynar®) and HDPE are also rated Good or better. Avoid aluminum hardware. Rated Fair (contact us before use): Hastelloy hardware.

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 Caustic Soda (50%) works with the plastics used to make our storage tanks.

Material	Rating
HDPE	Good
Polypropylene	Excellent
Nylon	Excellent
PVDF (Kynar®)	Excellent

Fittings

How Caustic Soda (50%) works with the plastics used for tank fittings.

Material	Rating
HDPE	Good
PVC	Excellent
CPVC	Excellent
Polypropylene	Excellent
PVDF	Excellent

Gaskets & O-Rings

How Caustic Soda (50%) works with gasket and O-ring materials.

Material	Rating
Buna-N	Excellent
EPDM	Excellent
Viton®	No Data SEVERE EFFECT

Metals

How Caustic Soda (50%) works with the metals used for fittings and bolts.

Material	Rating
316 Stainless Steel	Good
Hastelloy	Fair
Titanium	Good
Aluminum	Not Recommended