What each source says about specification
Where to buy| Product and class | Maker | Specification as printed | Source |
|---|---|---|---|
| PR-1422 B-1/2, B-2 | PPG | AMS-S-8802 Class B (tests) | PPG sheet |
| PR-1440 B-1/2, B-2 | PPG | AMS-S-8802D Type 2 | Distributor listing |
| PS-890 A, B, C | PPG | AMS-S-8802; BMS 5-45 | Distributor listing |
| PR-1776M B-2 | PPG | AMS 3281 Type 1 Class B-2; BMS 5-45 | PPG product page |
| CS 3201 A, B | Flamemaster | Not stated | Flamemaster bulletin |
This table copies what the sources print. It is not an approved interchange list.
How equivalence is decided
A product is an acceptable substitute only when the SRM, the AMM or the aircraft maker's approved material list says so, or when the specification's qualified products list includes it for the same type, class and dash number. A matching dash number is not enough: dash numbers give application life only. The cure time, tack-free time and temperature range vary by product, so a B-2 from one maker is not a B-2 from another.
Questions people actually ask
Can I swap PR-1422 for PS-890?
Only if the SRM or approved data allow it. Both cite an AMS-S-8802 style specification, but that is not an approval.
Is B-2 the same everywhere?
It means 2 hours application life at test conditions. Cure and tack-free times differ between products.
Limits — when NOT to use this
What the sources support, and no further.
- No approved interchange list. The SRM and the QPL decide.
- Two products are from distributor lists.
Where to buy
Distributors coming soon.
Sources
- PPG Aerospace, PR-1422 Class B Fuel Tank Sealant, data sheet (issue 09/10, Lit 0157) — Application life, tack-free, cure, slump, service range, storage; tests per AMS-S-8802 Class B.
- PPG PR-1440 B-1/2 Fuel Tank Sealant (distributor listing) — AMS-S-8802D Type 2 designation. Distributor listing, not the PPG data sheet.
- PPG PS890 B-1/2 Fuel Tank Sealant (distributor listing) — Two-part manganese dioxide cured polysulfide, service range, classes. Distributor listing, not the PPG data sheet.
- PPG Aerospace, PR-1776M Class B Low Weight Fuel Tank Sealant (product page) — Described by PPG as a manganese dioxide cured Permapol P-5 modified polysulfide; service range.
- PPG PR1776M B-2 Low Weight Fuel Tank Sealant (distributor listing) — AMS 3281 Type 1 Class B-2 and BMS 5-45 Class B-2.
- Flamemaster Corporation, Chem Seal CS 3201 Technical Bulletin — Two-part polysulfide: classes A and B, mixing, temperature effect on application life, hardness, adhesion.