lT-c-490B
July 21, 1971
SUPERSEDING
Int.Fed.Spec.TT-c-00490A(AIMY-NS)
Oecea,ber9,196Sand
Fed.Sp=. TT-C-490
Narch30,1961
FfGERAL SPECIFICATIW
CLEANING MSItUDS AND PRSTREAltGiNT OF FSRROGS
9JRFACSS FOR
ORGANIC COATIWGS
TZIASspecificationwasapprovtdbytheCommissioner,
FederafSupplyService,GeneralServicesAdministration,
fortheuseofallFederalagencies.
1. SCOPE AM C3ASSIFICATION
1.1 Scoe.
---%
Thisspecificationcoversthecleaning
methods and pretreatment of ferrous ❑etals
for the appl
cationoforganiccoatings(paint,varnish.lacquer,enamel,etc.).In addition this
specification covers the pretreatment of ferrous metal items containing small areas of zinc or
a3uminum surfaces or sccessory fabricated parts of zinc or aluminum requiring treazment (see 6.1,
6.2, sod 6.-11).
I.Z Classification l%is specification covers the following cleaning methods and surface
pretreatment procoss es:
1.2.1 Suface cleaning shall be by any of tbe following methcds 8s specified (see 6. 3):
Method I
- Mechanical or abrasive cleaning (sand, shot, grit, glass bead, seed, or
vapor blasting, or tumbling) (for ferrous surfaces only).
Method
II - Solvent (Imers ion, spray or vapor).
Method 111 - tbt alkaline (inmersion, spray or electrolytic) (for ferrous surfaces only).
Methcd IV -‘ Jhuls ion (with or without added %ater).
Method V -- Alka2 ine derusting (for ferrous surfaces only].
Method VI -
Phosphoric acid (alcohol ic, detergent or solvent type with detergent).
1.2.2 Chtmical conversion and pretreatment coatings shall be of the following types as speci-
fied (see 6.3].
Type 1 - Zinc phosphate.
. Type 11 - iron phosph.at e.
Type 111 - Organic pretreatment coat ing.
Type N - Non-aqueous iron phosphate.
2. APPLICASLE 0CCU4SSTS
2.1 The following documaits, of the issues in effect on date of invitation for bids or request
for proposal, form a part of this specification to the extent specified herein:
Federal Specifications:
QQ-S-698 - Steel, Sheet and Strip, L-oWCarbon.
QQ-Z-32S - Zinc Plating (Electrodepasited).
PPP-T-60 - Tape; IYessure Sensitive, Adhesive, Wat erpmo f-for Packaging and Sealing.
Federal Standarch
Fed. Test Methc.f Std. PA& 141 - Paint, Varnish, Lacquer and Related Materials; Lfethods of
Inspection, Sapling and Testing.
Area NFFP (See 6. 13)
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