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MIL-DTL-53072 Chemical Agent Resistant Coating \(Carc\) System Application Procedures And Quality Control InspectionThis document covers the requirements for application and inspection of the CARC systems used on military equipment. It is required for use in the selection process of the appropriate materials and procedures for the surfaces to be painted, and provides additional application, inspection, and quality control information for the below referenced cleaning, pretreating, and coating specifications. This document does not alleviate the need for proper consideration of corrosion prevention and control \(e.g., material selection, system design, manufacturing processes, maintenance and other considerations during vehicle development and maintenance\).

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MIL-DTL-53072E

TABLE I. The CARC system.

Process

Ferrous Metal

Aluminum and Aluminum Alloys

Cleaning

TT-C-490

MIL-DTL-5541 / TT-C-490

Pretreating

TT-C-490, type I zinc phosphate

DOD-P-15328 (wash primer)

and pretreatments for ferrous

MIL-C-8514 (wash primer)

substrates qualified to types III, IV,

MIL-DTL-5541/MIL-DTL-81706

(chemical conversion) 1/

and VIII, class A or C

MIL-A-8625 (anodize)

DOD-P-15328 (wash primer)

TT-C-490 pretreatments for aluminum

MIL-C-8514 (wash primer)

substrates qualified to types III, IV, and

VIII, class B or C

Priming

A-A-59745

MIL-PRF-23377, type I and II, class N2/

MIL-DTL-53022

MIL-DTL-53030

MIL-DTL-53084

MIL-PRF-23377, type I and II,

MIL-PRF-85582, type I and II, class N2/

class N 3/

MIL-PRF-32348, type I and II

Topcoating MIL-PRF-22750 (interior only)

MIL-PRF-22750 (interior only)

MIL-DTL-53039

MIL-DTL-64159

MIL-PRF-32348, type III and IV

1/ Use of type II conversion coating (non-hexavalent chromium) preferred, if

approved for application.

2/ The use of MIL-PRF-23377 and MIL-PRF-85582, Class N primers are approved for the

exterior of

aviation assets. For the interior of aviation assets, class C shall be used.

3/ May be used for mixed metal applications. Specific approval shall be obtained for use on

ferrous substrates.

3.2 Cleaning. Meticulous cleaning prior to pretreatment and painting operations is critical to

meeting the requirements of this specification. Improperly cleaned surfaces can interfere with

paint film formation and adhesion, which can cause paint defects and premature paint peeling

during service. Unless otherwise specified, surfaces shall be cleaned according to TT-C-490.

Surface oxides, rust, weld spatter, oil, grease and all other organic and inorganic contaminants

shall be removed prior to pretreatment. The cleaning method shall be determined by the base

material properties, the nature of the soil(s), the degree of contamination and the part geometry.

The following TT-C-490 methods shall be used singly or in combination to produce a clean

surface:

a. Method I

Mechanical or abrasive blast cleaning, sanding and grinding.

b. Method II

Solvent cleaning by immersion, spray, vapor or hand wiping.

c. Method III

Detergent cleaning by immersion, spray, ultrasonic, hot alkaline or

electrolytic methods.