1、MIL-C- 5056 30 January 1948 MILITARY SPECIFICATION COATING, PERMANENT RESIN; PROCESS FOR APPIXCATION OF, TO AIRCRAFT PARTS This specification was approved by the Departments of the Army, the Navy, and the Air Force for use of procurement services of the respecuve Departments. 1. SCOPE AND CLASSIFICA
2、TION 1.1 This specification is drawn to present detailed requirements governing the process for the application of permanent resin coating to aircraft parts other than engine parts. 2. APPLICABLE SPECIFICLPONS .I 2.1 Specifications.- The following specificationa of the issue in effect on the date of
3、 invitation for bids, shall form a part of this specification tothe exhit specified herein. Military mL-R-30b3 Resin-Coating, Permanent (For Internal ne Parts) “+5002 Surface Treatments (Except Priming and Painting) For Metal and Metal Parts in Aircraft Air ForceNavy Aeronautical AN-S-55 Stripper; C
4、leaner and Paint (for Ferrous Surfaces) (Copies of this publication and copies of other publications referenced herein or required for Govemment procurement, and the Index of Military Aeronautical (m or MIL) Standards, may be obtained upon application to the Conmanding General, Air Hateriel Command,
5、 Wright-Patterson Air- Force Base, ton, Ohio; or the Conmanding Officer, U. S. Naval Air Station, Johnsville, 3. REQUI-TS 3.1 Quiment.- The complete equipment used for the application of resin coating to aircraft parts shall be of such type as to produce the specified results to the satisfaction of
6、the Government Inspector. 3.2 Materials.- All materials used shall conform to the applicable speciflea- tions referenced herein. Application of resin coating to such aircraft parts aa are specified by the PTocuring Service shall be accomplished as herein prescribed and with material conforming to Sp
7、ecification MTLR-3043. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-3.3 Surface Treatment.- All parts shall be thoroughly cleaned so that all fingerprints and all shop coatings, dirt, metal chips, and other foreign substances are completely remove
8、d from all surfaces and shall receive appropriate surface pre- treatment in accordance with Specification NIS-SOO prior to application of the permanent resin coating. 3.3.1 Drying.- Parts shall be moisture free before application of the permanent resin coating. The time interval between cleaning and
9、 the application of the resin cat- ing shall be kept to a minimum, inasmuch as thoroughly cleaned and unprotected metal- bu, faces are extremely susceptible to corrosion. 3.3 2 Handline- The parts shall not be handled after cleaning in any maruier that will allow fingerprints, dirt, dust, and other
10、foreign substances to contaminate the surface to be coated. 3.4 Application of Resin Coating.- Application of resin coating to aircraft parts shall be accomplished preferably by spraying. When spraying is impractical, dip ping will be permitted provided all other requirements of this specification a
11、re met. If resin coating is to be applied to localized areas which cannot readily be dipped or sprayed, brush application mag be employed, provided al1 other requirements of Ws speci- fication are met. Application shall be so controlledthat the coating will be continuous, uniform and free from bubbl
12、es, fatty edges, pin holes, runs, sags, and other surface im- perfections. A very slight “organge peel“ shall. not be sole cause for rejection. tive utilFty of these standards should be limited to two weeks due to effects of deterioration. 4.3 Routine Baking Test.- In order to insure uniform baking
13、of parts having different mass, a color comparison standard may be prepared showing the color change resulting from the minimum and maximum baking conditions likely to be encountered in the manufacturers equipment. The color of the finished coating will be maintained intermediate between the specifi
14、ed limits of color. 4.4 spot Checking.- 4.4.1 Production spot checking shall be accomplished at sufficientsy frequent intervals to establish and maintain uniformity of coating and compliance with the other requirements of the specification to the satisfaction of the Inspector. Production spot checki
15、ng shall include investigation of requirements specified herein under Application of Resin Coating, Spotting, and the following: 4.4.1.1 Film Thickness.- Samples of various representative parts swl-be with- drawn from production after bakiyg and film thickness determined by “magne-gage“ or other sui
16、table means. 4.4.1.2 Baking Test.- Samples of various representative parts shall be with- drawn from production after baking and tested for adequacy_ of the baldng treatment by the follolring methods: (a) Underbake test: Apply a clean white cloth continually soaked - with acetone to various spots of
17、 a nunber of parts selected at random, rubbing briskly for one minute. No softening or removal of film or reduction in gloss should be apparent at the points of contact. (b) Overbake test: Compare varipus areas of samples selected from production for brittleness of film with panels prepared in accor
18、dance with Scecification MIL-R-3043. Comparison shall be made by drawing a knife blade over the surface and. observing the relative adhesion and tendency to chip or flake. Inspected parts, when not rejected, may be reconditioned.as specified under “Spotting.“ 4.4.2 Defective Samples.- When satisfact
19、ory samples are found sufficient addi- tional inspection shall be made to insure rejection of all parts wilth defective coating. 4.5 R6jection.v.- Parts rejected for unsatisfactory coating may have the coatini removed by processes referenced herein. Such parts shall be recleaned and recoated in acco
20、rdance with requirements of this specification Parts rejected solely for under- baking may be reclaimed by additional baking. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-5.1 Requirements for preparation for delivery are not applicable to this spe
21、cification. NO!ITCE: When Government drawings, specifications, or other other data are used for any purpose other than in connection with a definitely related Government procurement operation, the United States Government thereby incurs no resgonsibility nor any obligation.whatsoever; and the fact t
22、hat the Govern- ment may have formulated, furnished, or in any way supplied . the said drawings, specification, or other data is not to be regarded by-implication-or otherwise as in any manner licensing the holder or any other person or corporation, or conveying any rights or permission to manufacture, use or sell any patented invention that may in any way be related thereto. Custodian: Navy - BuAer Other interest: Air Force Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
