1、MIL-P-23242B 80 m 9777706 0303807 7 i K 22 . arch T982 A U R DING MI L-P-23242A( WEPS ) 25 June 1964 MILITARY SPECIFICATION PLASTIC COATING COMPOUND, STRIPPABLE, FOR ELECTROPLATING This specification is approved for use by the Naval Air Systems Command, Department of the Navy, and is available for u
2、se by all Depart- ments and Agencies of the Department of Defense. 1. SCOPE 1.1 Scope. This specification covers the requirements for one type of . hot-dip,-off, srippable plastic coating intended for masking metallic areas not to be plated during an electroplating process (see 6.1). 2. APPLICABLE D
3、OCUMENTS 2.1 Government documents, 2.1.1 Specifications, standards, and.handbooks. Unless otherwise sDecified.D. and handbooks of the issue 4. listed in-that issue of the Department f Defense Index of Specifications and Standards (DoDISS) specified in the solicitation form a part of this specificati
4、on to the extent specified herein. SPECIFICATIONS a FE DERAL PPP-B-576 - Box, Wood, Cleated, Veneer, Paper Overlaid. PPP-6-585 - Boxes, Wood, Wirebound PPP-B-591 - Boxes, Fiberboard , Wood-Cleated PPP-6-601 - Boxes, Wood, Cleated-Plywood PPP-6-621 - Boxes, Wood, Nailed and Lock-Corner PPP-6-636 - Bo
5、xes, Shipping, Fiberboard STAN DARDS MILITARY MIL-STD-105 - MIL-STD-129 - Sampling Procedures and Tables for Inspection by Attributes. Marking for Shipment and Storage, Beneficial comments (recommendations, additions, deletions) and any pertinent data which may be of use in improving this document s
6、hould be addressed to: Engineering Specifications and Standards Department (Code 93) , Naval Air Engineering Center, Lakehurst, NJ 08733, by using the self-addressed Standardization Document Improvement Proposal (DD Form 1436) appearing at the end of this document or by letter. THUS DOCUMENT AWB PAG
7、ES FSC 8030 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-_ fiIL-P-232LIZB 80 797770b 0303808 7 MIL-P-232426( AS) (Copies of specifications, standards, handbooks, drawings, and pub1 ications required by manufacturers in connection with specific acq
8、uisition functions should be obtained from the contracting activity or as directed by the contracting officer . ) 2.2 Other publications. The following documents form a part of this specification to the extent specified herein. The issues of the documents which are indicated as DOD adopted shall be
9、the issue listed in the current DoDISS and supplement thereto, if applicable. AMERICAN SOCIETY FOR TESTING AND MATERIALS (ASTM) ASTM D 92-78 ASTM D 2240 - Rubber Property - Durometer Hardness. (Application for copies should be addressed to the American Society for - Flash and Fire Points by Clevelan
10、d Open Cup. Testing and Materials, 1916 Race Street, Philadelphia, PA 19103.) UNIFORM CLASSIFICATION COMMITTEE, AGENT Uniform Freight Classification Rules (Application for copies should be addressed to the Uniform Classification (Industry association specifications and standards are generally availa
11、ble Committee, Room 1106, 222 South Riverside Plaza, Chicago, IL 60606.) for reference from libraries. groups and using Federal agencies . ) this specification and the references cited herein, the text of this specification shall take precedence. They are also distributed among technical 2.3 Order o
12、f precedence. In the event of a conflict between the text of 3. REQUIREMENTS 3.1 First article. When specified, a sample shall be subjected to first article inspection (see 4.4 and 6.2.1). 3.2 Material. The plastic coating compound shall cons solids, hot-mlt ce1 lulose acetate butyrate in combinatio
13、n and stabilizers. Waxes, foreign resins, migrating plastic or toxic materials shall not be present. st of 100 percent with plasticizers zers , ch 1 ori nated 3.2.1 Appearance. The appearance of the compound as received shall be in cake form, pink to red in color, visibly free of contaminants and ex
14、udation. 3.3 Chemical and physical properties. The ce1 lulose acetate butyrate compound shall conform to the requirements specified in table I. 3.4 Workmanship. The plastic coating compound shall be manufactured by such processes as to meet all the requirements of this specification. 2 . , . ._ .-,
15、. ._ - . i i. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-P-232LI2B 0 m 7777706 0303807 O MI L -P -23242 B (AS) 4. QUALITY ASSURANCE PROVISIONS 4.1 Responsibility for inspection. Unless otherwise specified in the contract or purchase order, t
16、he contractor is responsible for the performance of all inspection requirements as specified herein. Except as otherwise specified in the contract or purchase order, the contractor may use his own or any other facilities suitable for the performance of the inspection requirements specified herein, u
17、nless disapproved by the Government. The . Government reserves the right to perform any of the inspections set forth in the specification where such inspections are deemed necessary to assure supplies and services conform to prescribed requirements. O 4.2 Classification of inspections. The inspectio
18、n requirements spec herein are classified as follows: f ied a. First article inspection (see 4.4). b. Quality conformance inspection (see 4.5). 4.3 Inspection conditions. Unless otherwise specified, all inspections shall be performed in accordance with the test conditions specified in the appl icabl
19、e test paragraph herein. 4.4 First article inspection. First article inspection shall consist of all the inspection procedures of this specification (see 4.7). responsibility for the performance of the first article inspection shall be as specified in the contract or order (see 6.2). The 4 test 4.1
20、First article sample. Unless otherwise specified, first article samples shall consist of two cakes of plastic coating compound. 4 4.2 Prior approval. When a contractor has previously delivered plastic coat ng compound in accordance with the requirements of this specification and his product has been
21、 found to be satisfactory, the requirements for a first article sample and first article inspection for any subsequent contract or order may be waived at the discretion of the acquiring activity (see 6.2). 4.5 Quality conformance inspection. 4.5.1 Lot formation. A lot shall consist of all plastic co
22、ating compound manufactured by the same process, in the same production run, and offered for delivery at one time. 4.5.2 Sampling and inspection. 4.5.2.1 Chemical and physical property i-nspection. Samples shall be selected in accordance with inspection level II of MIL-STD-105 and examined to the pr
23、operties specified in table II. defective. 4.5.2.2 Packaging. The lot size for this inspection shall be the total number of shipping containers. prepared for delivery just prior to closure. The inspection level shall be S-2 and the AQL shall be 4.0 defects per 100 units. Inspection shall be in accor
24、dance with 4.8 and section 5 of this specification. The AQL shall be 2.5 percent The sample unit shall be one cake of plastic coating compound. The sample unit shall be one container fully Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-p_ MIL-P-232L
25、iZB 80 777770b OL03BLO 7 I - MIL-P-232426 (AS) . 4.6 Standard conditions. Unless otherwise specified, tests shall be conductea at a temperature of 750 - + 50F (240 - + 3%) with.a relative humidity of 50 f 5 percent. 4.7 Inspection procedures. 4.7.1 Visual examination. Each cake of plastic coating co
26、mpound shall be examined to verify conformance with 3.2 and 3.4, and all other requirements which do not involve tests. 4.7.2 Life. A 5 pound sample of the coating compound shall be placed in a closed pot-ated to, and then operated continuously at 3500 t 5OF (1770 + 3oC) for a period of 500 hours. h
27、ours each 24 hour period to reflect shop conditions. The method of heating the pot shall not produce Ilhot“ spots. mechanically agitated. After the 500 hour period, the coating compound shall be examined for conformance to the flexibility, odor, sealing and adhesion, contaminants, workabi 1 ity, str
28、ippabil ity and corrosion requirements specified in table I. The pot shall be opened for 2 The coating compound shall be 4.7.3 Flexibility. An aluminum panel, 3 by 6 inches, shall be submerged vertically in the plastic coating compound for 3 to 5 seconds, and then removed from the compound. After th
29、e coating has hardened (60 seconds minimum), it shall be stripped from the panel, and placed in a cold box at -300 t l*F (-34.40 + 0.5OC) for one hour. While at this low temperature, the plastic coating shall be bent through an angle of 1800 over a 1/8 inch diameter rod. Evidence of fracture shall b
30、e cause for rejection. 4.7.4 Odor, The Ilas received“ plastic coating compound shall have a characteristic butyric odor and the compound shall not develop an obnoxious odor after being heated as described in 4.7.2. 4.7.5 Weight. The material snall be weighed on an accurate scale, calibrated in pound
31、s and ounces. 4.7.5 Fire point. The fire point of the material shall be determined in accordance with ASTM D 92-78, except that the melted compound in the cup shall be coiitinuously stirred with the thermometer during the test. The thermometer shall be hung in the specified position and then given a
32、 circular.motion of 2 cycles per second. every 5 degree rise in temperature to permit passage of the test flame across the surface of the compound. The stirring motion shall be interrupted momentarily for 4.7.7 Hardness. Type A hardness shall be determined in accordance with ASTM D 224wdness shall b
33、e the average of 5 instantaneous readings. 4.7.8 Operating temperature. A piece of coating compound, weighing approximately I6 ounces, shall be placed in a thermostatically controlled heating vessel . The temperature shall be slowly raised to 3500 + 5OF (1770 t 3oC), at which temperature all of the
34、compound shall be in the 1 iquid-phase. 4.7.9 Sealing and adhesion. A chromium bath, self regulating high speed (SRHS), or equivalent, shall be used. After plating and removal of the strippable mask-off compound, plating solution seepage shall not be evident. Provided by IHSNot for ResaleNo reproduc
35、tion or networking permitted without license from IHS-,-,-NIL-P-232429 80 W 9999906 0103811 9 MIL-P-23242B(AS) 4.7.10 Contaminants. A sample of the compound shall be placed in boiling water. After the water has been allowed to cool there shall be no evidence of scum or ther contaminants on the surfa
36、ce of the water. alkaline solution, followed by rinsing in clear hot water, and allowed to dry, shall be suitable for re-use without danger of contaminating plating solutions (see 6.3). A sample of this compound shall be subjected to the test described in 4.7.10 to determine if contaminated. 4.711 R
37、e-use. The used compound from 4.7.10, after rinsing in a hot 4.7.12 Weight loss. Approximately 10 grams of compound shall be accurately weighed on a tared 4 inch pyrex watch glass. heated at 350 + 5OF (177O + 3OC) for 5 hours in a gravity convection oven. After cooling to room temperature, the sampl
38、e and watch glass shall be re-weighed. The heat loss shall be calculated as follows: The sample shall be Weight loss, (%) = Wt. compound (initial) - Wt. compound (after heating) x 100 Wt. compound (initial) 4.7.13 Immersion time. The metals to be coated shall be immersed 3 to 5 seconds in the melted
39、 compound, at a temperature of 350 + 5OF (1770 + 3OC). then be subjected to the examinations specified in 4.7.14, 4.7.15 and 4.7.16. Only one immersion shall be permitted. The plastic compound sKall 4.7.14 Hardenin time. After the immersion operation, the coating on the metals shal A har en an e rea
40、dy to trim in 60 seconds. 4.7.15 Workability. The hardened compound from 4.7.14 shall be easily trimmed with a sharp knife. 4.7.16 Strippability. The hardened compound (see 4.7.14) shall be easily removed by stripping or peeling, after cutting with a sharp knife. L7.17 Corrosion. One weighed panel,
41、each 2 inches square, of brass, lead, steel and zinc shall be imniersed in the plastic compound for 8 hours at 350 + 5OF (177O + 3OC). The panels shall be removed, and the hardened plastic coating stripped. The panels shall be weighed after stripping to determine conformance with the corrosion requi
42、rements specified in table I. 4.8 Preservation, packing and marking. Packaging shall be examined for conformance with Section 5. 5. PACKAGING 5.1 Preservation. Unless otherwise specified, no preservation/packaging is required. 5.2 Packin . The plastic coating compound shall be packed level A, B, or
43、5.2.1 Level A. Compound shall be packed in overseas type or class boxes C, as spec1 -7-3 ie in the contract or order (see 6.2). conforming to any of the following specification: PPP-B-591 , PPP-B-601 , PPP-6-621 and PPP-B-576. shall conform to the box specification and the appendix thereto, PPP-B-58
44、5 (class 3), Box cl-osure and strapping 5 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-P-23242B 0 7777706 OLO38L2 O W - MIL-P-232426( AS) 5.2.2 Level B. The plastic compound shall be packed as specified for level A, except that domestic type o
45、f class boxes shall be used, and fiberboard boxes conforming to weather-resistant class of PPP-6-636 may be used. Closure shall be in accordance with the appendix thereto. 5.2.3 Level C. Cakes of plastic coating compound shall be packed in containerme type, size and kind commonly used for the purpos
46、e, in a manner that will insure acceptance by common carrier and safe delivery at destination. Shipping containers shall comply with the Uniform Freight Classification Rules, or regulations of other carriers as applicable to the mode of transportation. 5.3 Markin . In addition to any special marking
47、 required ty the contract or order, -I+ s ipping containers shall be marked in accordance with MIL-STD-129. 6. NOTES 6.1 Intended use. The plastic coating compound covered by this specification is intended for masking metallic areas not to be plated during an electroplating process. nickel and all c
48、ommon plating solutions It is not suitable for use in electroless nickel, and has limited use in hot electro-cleaners, strong hot caustic solutions, and specified chemical milling solutions. It is suitable for chromium, copper, cadmium, 6.2 Ordering data. 6.2.1 Acquisition requirements. Acquisition
49、documents should specify the fol lowing: a. Title, number and date of this specification. b . Quant i ty requ i red . c. Responsibility for performance of first article inspection (see 4.3 and 6.2.2). d. Whether first article inspection is required (see 4.4.2 and 6.2.2). e. Level of packing (see Section 5). 6.2.2 First article. Contracts or purchase orders shall specify the fol lowing requirements for first article inspection: a. Where first arti
