TT-C-490F
(Copies of these documents are available from www.sspc.org or SSPC: The Society for Protective Coatings, 40
24th Street, 6th Floor, Pittsburgh, PA 15222-4656.)
INTERNATIONAL ORGANIZATION FOR STANDARDIZATION
ISO 9000/17025 standards - Quality management systems of standards and guidelines
2.3 Order of precedence. Unless otherwise noted herein or in the contract, in the event of a conflict between the text of this document and the references cited herein, the text of this document takes precedence. Nothing in this document, however, supersedes applicable laws and regulations unless a specific exemption has been obtained.
3. REQUIREMENTS
3.1 Material. All material used shall be as specified herein, on the drawings, or in the contract. Materials not specified shall be selected by the contractor and shall be subject to all provisions of this
specification. The prime and sub-tier contractor shall meet all requirements unless directed otherwise by the contract.
3.2 Preproduction approval. Preproduction approval for types I, II, and V as required by contract.
3.2.1 Procedure approval (types I , II, and V). Prior to production, a detailed written procedure identifying cleaning, pretreatment and painting processes shall be submitted to the procuring agency for approval. Process time, temperature, chemical concentrations, process controls and acceptance criteria and any other pertinent details shall be listed for each step of the application process. The procedure shall include the manufacturer and exact proprietary designation of any material used as well as any equipment used in the application of the procedure. The complete procedure which demonstrates ability to pass the performance tests contained herein is to be signed by a company official prior to its submittal for approval. Deviation from the approved procedure is not permitted without written approval from the procuring agency.
3.2.2 Preproduction validation panels. (types I , II, and V). The contractor shall coat fifteen (4 X 6 inch) panels (see 4.7.2) by the proposed zinc phosphate coating procedure outlined for use in the contract. The test panels shall be the same substrate as will be used in production. Standard test coupons may be used for processing low carbon steels only. Six of the coupons shall be coated with the primer (or paint for single coat systems) to be used in production. The primer dry film thickness shall be 1.5
(+/- 0.2) mils unless otherwise specified in the contract. Three of the non-primed coupons shall be checked for phosphate coating weight, and the resultant coating weight test analysis report shall be provided to the procuring agency. Three of the primed coupons shall be performance tested by the contractor in neutral salt spray for accelerated corrosion resistance unless superceded by an accelerated corrosion test specified in the contract. Ferrous surface specimens of zinc or zinc alloy coated surfaces shall be exposed as specified in ASTM B117. The remaining nine panels (three phosphated only; three phosphate plus primer; three phosphate, primer, and topcoat) shall be forwarded to the procuring activity for evaluation and testing.
3.2.3 Stress Relief. (types I, II, and V). Unless otherwise specified in acquisition documents, parts with a surface or through hardness of Rockwell C 39 or greater shall be given a stress relief treatment. This includes carburized, induction hardened, flame hardened, etc. treatments. Also, any part that is ground,
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