Chromium-Free
Primer for Threaded Fasteners
(Pratt & Whitney - United Technologies Corporation)
Project Number: J-95-MF-003
Status: Completed in 1999
Potential Alternatives Report
The PAR describes how alternatives were identified and selected for testing. Initially, 18 candidate alternatives to zinc chromate primers were identified through literature searches and direct vendor queries. Manufacturers and distributors of the identified alternatives were contacted, and technical, ESOH information about the alternatives was compared with the baseline process. Seven of these identified candidate alternatives were classified as technically viable alternatives based on available information. These viable alternatives were: 02-W-38 (Deft Inc.); Alumazite ZDA (Tiodize Co., Inc.); EEAE136 A/B (Spraylat Corporation); PR-1875-C (Courtaulds Aerospace, Inc.); TT-P-645B Zinc Molybdate Primer (Randolph Products Company); TT-P-664D High Solids Primer (Randolph Products Company); and ZRC Cold Galvanizing Compound (ZRC Products Company).
The key material and process characteristics of the viable alternatives were compared to the selected material and process characteristics of the zinc chromate primer (one component system, room temperature cure, flexible binder system, etc.). The ESOH characteristics of the viable alternatives were also evaluated. As a result of this evaluation, technical representatives selected four of the seven viable alternatives as potential alternatives for laboratory screening tests prior to JTP validation testing. The four potential alternatives selected by the technical representatives included:
- Alumazite ZDA (Tiodize Co., Inc.)
- TT-P-645B Zinc Molybdate Primer (Randolph Products Company)
- TT-P-664D High Solids Primer (Randolph Products Company)
- ZRC Cold Galvanizing Compound (ZRC Products Company).
To view the PAR for Alternatives
to Zinc Chromate Primer for Galvanic Corrosion Protection for Inserts
and Fasteners in Aircraft Engines, dated March 3, 1998, please click
here.
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