Fitting — Caustics/Bases
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LibertyCES has documented Fitting in Caustics/Bases service, including Sodium Hydroxide. Wetted materials to confirm: X-Link/XLPE gasket. Compatibility depends on exact concentration, temperature and duty cycle, so confirm with a free spec review.
Notes from the vendor documentation
X-Link/XLPE gaskets flagged as leak-prone on reinstall — a real material-selection caveat for caustic tank fittings.
Materials documented for this service
- X-Link/XLPE gasket (no form memory, leak risk on reinstall)
Products cited for this service
Real Specifications
| Spec | Value | Source document |
|---|---|---|
| Poly Processing Bulkhead Fitting creep limitation | Sizes ½"-6"; "creeps" over time (nut loosens), requires drip monitoring; must not be used on bottom sidewall of tanks >3,000 gal or >6 ft height | Poly Processing — Fittings & Accessories |
| Peabody X-Link/XLPE gasket rating | 32-140°F; matches tank material but has no form memory — can leak on reinstall | Peabody Engineering — General Product Catalog (July 2026) |
| Peabody Viton/FKM gasket caustic rating | -20-302°F; explicitly not suitable for caustic chemicals | Peabody Engineering — General Product Catalog (July 2026) |
| Peabody NaOH/KOH material guidance | Sensitive below 65°F (insulation/heat tracing may be required at or above 50% concentration); EPDM elastomers compatible, Viton not recommended, PVDF not recommended | Peabody Engineering — General Product Catalog (July 2026) |
Two independent vendors flag the same caustic bulkhead-fitting failure mode from different angles: Poly Processing's bulkhead fitting creeps and loosens over time on caustic tanks above 3,000 gal or 6 ft height, and Peabody's X-Link/XLPE gasket has no form memory and can leak specifically on reinstall — both point to the bulkhead connection as the real recurring weak point, not the tank wall.
A caustic tank rarely fails at the wall — it fails at the bulkhead fitting, where Poly Processing's own spec bars its economical bulkhead fitting from large caustic tanks and Peabody double-excludes both Viton and PVDF for NaOH, a materially more specific caution than the generic "caustic-compatible" claim most catalogs stop at.
Every material and product claim on this page traces to real, vendor-published documentation on file with LibertyCES. Chemical compatibility depends on exact concentration, temperature, and duty cycle — confirm current specifications with the manufacturer and request a spec review before final specification.
FAQ
Can Fitting handle Caustics/Bases?
X-Link/XLPE gaskets flagged as leak-prone on reinstall — a real material-selection caveat for caustic tank fittings.
What wetted materials should Fitting use in Caustics/Bases service?
Materials documented for this service: X-Link/XLPE gasket (no form memory, leak risk on reinstall). Compatibility depends on exact concentration, temperature and duty cycle, so confirm with a spec review before final specification.
Which Caustics/Bases chemicals does this cover?
Named chemicals in this documentation: Sodium Hydroxide (creep-prone bulkhead fittings).
Which Fitting models are documented for Caustics/Bases?
Documented examples include Poly Processing/Peabody bulkhead fittings.
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Reviewed by James Riggins, 30+ years specifying water and chemical process equipment · Updated