Storage Tank — Caustics/Bases
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LibertyCES has documented Storage Tank in Caustics/Bases service, including Sodium Hydroxide and Potassium Hydroxide. Wetted materials to confirm: EPDM, Viton and PVDF. Documented models include Peabody ProChem and Poly Processing IMFO/SAFE-Tank. Compatibility depends on exact concentration, temperature and duty cycle, so confirm with a free spec review.
Notes from the vendor documentation
Peabody's bulkhead-fitting table shows an unusual double-exclusion: both Viton and PVDF explicitly not recommended for NaOH, EPDM required.
Materials documented for this service
- EPDM (required)
- Viton (NOT recommended)
- PVDF (NOT recommended)
Products cited for this service
Real Specifications
| Spec | Value | Source document |
|---|---|---|
| NaOH/KOH crystallization threshold | Sensitive to temperatures below 65°F; insulation and heat tracing may be required at 50%+ concentration | Peabody Engineering — General Product Catalog (July 2026) |
| NaOH elastomer compatibility | EPDM compatible; Viton NOT recommended; PVDF NOT recommended | Peabody Engineering — General Product Catalog (July 2026) |
| NaOH tank warranty | XLPE construction carries a full, unconditional 5-year warranty for sodium hydroxide service | Poly Processing — Chemical-Specific Storage Guidance |
Sodium hydroxide will crystallize and go solid if the tank isn't kept at the right temperature — Peabody ties this specifically to service below 65°F at 50%+ concentration, at which point insulation and heat tracing become a real design requirement, not an option.
Most suppliers default to Viton because it reads as the general "chemical-resistant" choice — but Peabody's own bulkhead-fitting table flags both Viton and PVDF as unsuitable for sodium hydroxide, with EPDM the material that actually holds. Liberty CES specs the elastomer against the chemical, not against a generic resistance label.
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 Storage Tank handle Caustics/Bases?
Peabody's bulkhead-fitting table shows an unusual double-exclusion: both Viton and PVDF explicitly not recommended for NaOH, EPDM required.
What wetted materials should Storage Tank use in Caustics/Bases service?
Materials documented for this service: EPDM (required), Viton (NOT recommended), PVDF (NOT recommended). 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, Potassium Hydroxide.
Which Storage Tank models are documented for Caustics/Bases?
Documented examples include Peabody ProChem, Poly Processing IMFO/SAFE-Tank.
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Reviewed by James Riggins, 30+ years specifying water and chemical process equipment · Updated