Hydrogen Peroxide (H₂O₂)
Narrower elastomer tolerance than sodium hypochlorite at comparable dilution — "oxidizer" is not one compatibility category.
Hydrogen peroxide has narrower material compatibility than sodium hypochlorite at comparable dilution, so oxidizers should not be treated as one category. EPDM and FKM both fail by 35-50% H2O2, and PVC and CPVC hit a hard ceiling at 50% regardless of temperature. Only ECTFE, FEP and PFA stay reliably resistant at 70-90%.
Hydrogen Peroxide: identifiers
| CAS Registry Number | 7722-84-1 |
|---|---|
| Molecular formula | H2O2 (Hill notation) |
| Molecular weight | 34.015 g/mol |
| PubChem record | CID 784: Hydrogen Peroxide |
What Survives, By Concentration
≤20%
PVC/CPVC good through 140-176°F. FKM good through 176°F. EPDM only good to 68°F, conditional by 104-140°F, failing by 176°F — narrower tolerance than for sodium hypochlorite or sulfuric acid at comparable dilution.
≤35%
PVC drops to only 68°F (no higher-temp resistant data). CPVC conditional at 68°F, failing by 104°F. FKM good to 104°F, failing by 140°F. EPDM conditional at 68°F, failing by 104°F — meaningfully narrower than the ≤20% row.
50%
PVC, CPVC, FKM, EPDM, and NBR all fail even at 68°F. PVDF and ECTFE remain resistant-to-conditional through 140-176°F — a real, distinct capability gap at this concentration.
70-90%
Only ECTFE, FEP, and PFA remain resistant. HDPE, PP, and PVDF all drop to conditional (70%) or failing (90%).
Source: combined chemical resistance chart, 858 real data rows. Confirm current ratings with the manufacturer before final specification.
Frequently Asked Questions
Is hydrogen peroxide compatibility the same as other oxidizers like sodium hypochlorite?
No — this is a real, easy-to-miss distinction. "Oxidizer" is not a single compatibility category. Hydrogen peroxide's elastomer tolerance is narrower than sodium hypochlorite's at comparable dilution — both EPDM and FKM fail by 35-50% H2O2, a lower threshold than the same materials show against NaOCl. Each oxidizing chemical needs its own compatibility check.
At what H2O2 concentration do PVC and CPVC fail?
By 50% concentration, both PVC and CPVC fail even at room temperature (68°F) — a hard concentration ceiling, not just a temperature limit. Below that, tolerance narrows progressively: PVC is only rated resistant to 68°F at ≤35% (no higher-temperature resistant data), down from 140-176°F at ≤20%.
What material is required for concentrated (70-90%) hydrogen peroxide?
Only ECTFE, FEP, and PFA remain resistant at 70-90% concentration. HDPE, PP, and PVDF all drop to conditional at 70% and fail outright by 90% — a real material-class exclusion at high concentration, not just a caution.
Confirm your exact concentration before you specify
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Reviewed by James Riggins, 30+ years specifying water and chemical process equipment · Updated