1、MILITARY SPECIFICATION MIL-S-85318(AS) 27 March 1979 SEALING COMPOUND, NON-CARCINOGEN CURING POLYURETHANE (POLYETtlliR-BASED), ELECTRIC CONNECTORS AND ELECTRIC SYSTEMS This specification is approved for use by the Naval Air Systems Command, Department of the Navy, and is available for use by all Dep
2、artments and Agencies of the Department of Defense. 1 . SCOPE 1 . 1 Scope. This specification covers the requirements for a two-component, elevated temperature curing, reversion resistant polyether polyurethane compound for sealing and embedding electrical and electronj c components in Military weap
3、ons Systems. Component materials and cured compound shall not contain any known carcinogens. 1.2 Classjfication. The sealing compound shall be of the following types and classes as specified (see 6.2). Type 1 - Two component Type II - Premixed, degassed and frozen Class 1 Hardness point range of 655
4、 Class 2 Class 3 2. APPLICABLE DOCUMENTS Hardness point range of BOS Hardness point range of gotS 2.1 Issues of documents. The following documents of the issue in effect on the date of invitation for bids or request for pro-posa, form a part of this specification to the extent specified herein. Bene
5、flcial comments (recommendations, additions, deletions) and any pertinent data which may be of use in improving this document should be addressed to: Engineering Specifications and Standards Department (Code 93), Naval Air Engineering Center, Lakehurst, NJ 08733, by using the self-addressed Standard
6、ization Document Improvement Proposal (DD Form 1426) appearing at the end of this document or by letter. FSC B030 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-SPECIFICATIONS Federal QQ-A-250j4 QQ-A-250/13 PPP-B-585 PPP=B=601 PPP-B-621 PPP-B-636 PP
7、P-C-96 Militarv HIL-E-5272 MIL-R-68SS MIL-S-8660 MIL-S-18729 MIL-W-22759/9 MIL-L-23699 STANDARDS Military MIL-STD-IOS MIL-STD-129 MS3100 MS3103 MS3106 MIL-S- 85318(AS) Aluminum Alloy, 2024, Plate and Sheet Aluminum Alloy Alclad 7075, Plate and Sheet Box, Wood, Wirebound Box, Wood, Cleated-Plywood Bo
8、x, Wood, Nailed and Lock Corner Box, Fiberboard Can, Metal, 28 Gage and Lighter Environmental Testing, Aeronautical and Associ ated Equipment, General Specification for Rubber, Synthetjc, Sheets, Strips, Molded or Extruded Shapes Silicone Compound Steel Plate, Sheet and Strip Alloy 4130, Aircraft Qu
9、ality Wire, Electric, Fluorocarbon-Insulated, Extruded TFE, Silver-Coated Copper Conductor, lOOO-Volt Lubricating Oil, Aircraft Turbine Engines, Synthetic Base Sampling Procedures and Tables for Inspection by Attributes Marking for Shipment and Storage Connector, Receptacle, ElectriC, Wall Mounting
10、Connector, Receptacle, Electric for Potting Connector, Plug, Electric, Straight Plug, Electric, for Potting 2 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-M1L-S- 85318(AS) Copies of specifications, standards, drawings, and publications requIred by
11、 contractors in connection with specific procurement func tions should be obtained from the procuring activity or as directed by th contracting officer.) 2.2 Other publications. The following docwnents form a part of this specification to the extent specified herein. Unless other wise indicated, the
12、 issue in effect on date of inv:i tation for bids or request for proposal shall apply. Amerlcan Society for Testing and Materials ASTM D 149 ASTM D 150 ASTM D 257 ASTM D 395 AST11 D 412 ASTM D 495 ASTH D 518 ASTll D 624 ASTM D 792 ASTM D 1149 ICTM n ) ) I. f“ hulU U -. V Dielectric Breakdown Voltage
13、 and Dielectric Strength of Electrical Insulatng Materials at Commercial Power Frequencies A-C Loss Characteristics and Dielectric Constant (Permittivity) of Solid Electrical Insulating Materials D-C Resistance or Conductance of Insulating Materials Compression Set of Vulcanized Rubber Tension TestI
14、ng of Vulcanized Rubber High-Voltage, Low-Current, Arc Resistance of Solid Electrical Insulating Materials Surface Cracking Resistance of Stretched Rubber Compounds Tear Resistance of Vulcanized Rubber Specific Gravity and Density of Plastics by Displacement Accelerated Ozone Cracking of Vulcanized
15、Rubber Indentation Hardness of Rubber and Plastics by Means of a Durometer (Appli ca tion for copies of ASTt-1 Standa rds should be add res sed to the American Society for Testing and Materials, 1916 Race Street, Phila delphia, Pennsylvania 19103.) - - - - -r-Provided by IHSNot for ResaleNo reproduc
16、tion or networking permitted without license from IHS-,-,-MIL-S- 8531 8.(AS) UNIFORi-1 CLASSIFICATION COmnTTEE, AGENT Uniform Freight Classification Rules (Application for copies should be addressed to the Uniform Classifi caLion Committee, Room 106, 222 South Riverside Plaza, Chicago, Illinois 6060
17、6.) 3. FQUIFMF.NTS 3.1 Classification of requirements. The requirements for the sealing compound are classified herein as follows: Requirement la teria 1 Primer Appearance Toxicity Color Properties before cure Properties arLer cure Storage life Paragraph 3.2 3.2.1 3.2.2 3.3 3.4 3.5.1 3.5.2 3.6 3.2 M
18、aterial. The sealing compound shall be a two-compon-ent system consist-ing of a prepolymer of t-he polyether polyurethane tY1e and a curing agent before mixing. The prepolymer shall cure by the addition of the curing agent and shall not depend on solvents or mois ture for curing. Primer. The use of
19、a primer to improve the adhesion of the sealing compound is permitted. The primer shall be recommended by the manufacturer and shall be included in the tests of this specification. The primer shall be identified on the applicable Qualified Products List (QPL). The use and application of the acceptab
20、le primer shall be in strict accordance with the manufacturers instructions_ 3.2.2 Appearance. Each component, and mixed compounds shall have a uniform homogeneous texture and shall be free of coarse particles, foreign matter and lumps. Storage of the materials shall cause no separation or crystalli
21、zation of ingredients vhich cannot be readily re-dissolved on heating to approximately 49C (120F). 3.3 Toxicitv. Each component and mixed uncured compound, or cured compound shall have no adverse effect on the health of personnel engaged in the mixing and application of the systems under conditions
22、of adequate ventilation and while exercising caution to avoid prolonged contact with the skin and while observing Occupational Safety and Health Administration (OSHA) guidelines (see 6.4). 4 +- h “ 1 1 _ _ _ 1 _ L _ _ _ _ Provided by IHSNot for ResaleNo reproduction or networking permitted without l
23、icense from IHS-,-,-MIL-S- 85318(AS) 3.4 Color. Unless otherwise specifled in the contract or order, the compound shall be furnished in the color manufactured. Characteristics and performance 3.5.1 Properties before curing 3.5.1.1 Nonvolatile content. The nonvolatile content of the mixed compound sh
24、all be not less than 99 percent when tested as speci fied in 4.5.1.1. 3.5.1.2 Application life. The requirements for application life shall include the determination of the initial viscosity of mixed type I compound! initial flov; rate of type II compound when brought to room temperature, and the ap
25、plication time. 3.5.1.2.1 Initial viscositv of mixed type I compound. When tested as specified in 4.5.1.2.1, the required initial viscosity range for each Class of type I compound shall be 8,000 to 12,000 centipoises. 3 . 5 . 1 . 2 . 2 In i t i a 1 flo w rat e ( t yp e I I ). Ylh e n t est e d ass p
26、 e c i fied in 4.5.1.2.2, the initial flow rate of type II compound for each class shall be 200 to 900 grams per minute. 3.5.1.2.3 Application time. The appli.cation time of the mixed compound shall be not less than 90 nanutes Cminimwn specified time to reach 250,000 centipoises) when tested as spec
27、ified in 4.5.1.3. 3.5.2 Properties after cure. 3.5.2.1 Phvsical properties. The physical properties of the cured compound shall conform to the reqUirements of table I. 3.5.2.2 Electri cal properties. The electri cal properties of the cured sealing compound shall conform to the requirements of table
28、II . 3.6 Storage life 3.6.1 Type I. The manufacturer shall certify that the type compound after storage in the original unopened container at standard conditions (4.4.1) for 180 days when mixed and cured as specified in 4.4.2 and 4.4.5 respectively, shall conform to the requirements of tables I and
29、II. 3.6.2 Type II. The manufacturer shall certify that the type II compound after storage -34.41.1C (-302F) for 60 days when cured as specified in 4.4.5, shall conform to the requirements of tables I and II. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IH
30、S-,-,-TABLE I Phvsical Physical property Hrlrnnp Tvnp A DllrompLpr 1/ -, -r-_. - _ Tensile Strength, PSI, minimum Ultimate elongat.ion, percent, min. Shrinkage percent, maximum Specific gravit.y Tear strength, pPl, mln. Compression set, percent max. Adhesion, lbs/inch of width, min. To sLeel To alwn
31、inum Moisture absorption, percent max. Low temperature flexibility at _ oOr (_O, ?! J.J .; -“ v.; J =- Fungus resistance Ozone resistance, 28 days exposure / Oil resiSLance: r“_/, “rl. h . _Ar“Ior“!. ,.,.r1o,.rrI.f“i-V11 max. I O I O I o 14.5.2.3 Poe:c: OL.J v 11 i), max. IV Ilu II 114.5.2.3 1 kiloh
32、ertz at 25C (77F), max. 0.06 0.06 0.06 1 megahert.z at 25C (77F), max. 1 0 . 10 10 .0 J 0.10 I Volumf resistivity, Ohms-CMS: I 1 I 14 5 2 4 at 25C (77F), min. 14 v IOU J6 X 1011 ,1 X 1012 I -+ 10,01“ ()c:(“O _ ) . v 1(“9 :;. v 1r.9 c:.) 1J.nv 9 .:L.: I I I 14.5.2.6 12.0 X 05 13.0 X 105 13.5 X 1051 1
33、400 1700 1750 1 I I :; 1 s I 12.0 X 10 13.0 X 10 13.5 X 10-, After hydrolytic stability I I I 1 lnsulatlon resistance, megotuns, “,n lnnn lnnn 1nnn ? 7 III-LH ILdowVrl reak- I v rca k - I reak -(. - . , Flame resIstance overload Idown I dOo.n 14.5.2.7 IShall not IShall not IShall notI4.5.2.8 lignite
34、 lignite I ignite I ! High potentlal 1/ Bsed on average - - _ _.J _ -. I“ _ .:. -. w.: +- k ,. “ . LUIllPUUUU pLUpeIL-1e W-Ll.-lIUUL special processing. 7 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-S-85318(AS) 4. QUALITY ASSURANCE PROVISIONS
35、 4.1 Unless otherwise specified in the contract or purchase order, the contractor is respons ible for the performance of all inspection requirements as specifid herein. Except as othen 1ise specified in the contract or order, the contractor may use his own or any other facili ties sui table for the
36、performance of the inspection requirements specified herein, unless 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 the prescribed
37、requirements. 4.2 Classification of inspections. The. examination and testing of the sealing compound shall be classified as quali ty conform ance (see 4.3). 4.3 Quality conformance 4.3.1 Lot formation. Unless otherwise specified, a lot shall consist of all the material of the same type and class, m
38、anufac tured at one time from one batch (see 6.3), forming part of one contract or order and submitted for acceptance at the same time and place. 4.3.2 Report of tests. The manufacturer shall submit test reports to the Goverlent representative for each lot showing the results including numerical val
39、ues when applicable of all the requirements in 3.5.1, 3.5.2, table 1 and table II. In addition, the manufacturer shall certify to the storage requirements of 3.3 and 3.6. Reports of numerical tests as satisfactory are not acceptable. 4.3.3 Sampling and inspection procedures. 4.3.3.1 Sampling for tes
40、ts. Samples shall be randomly selec-ted from each lot of sealing-compound-offered for inspection. Sufficient material shall be selected to complete the testing of all requirements specified in 4.3.2. The material selected shall be visually examined to 3.2.2 and 3.4. Failure of the sealing compound t
41、o pass any requirement shall be cause to reject the lot represented by the material. 4.3.3.2 Packaging. A quanti ty of shipping conta iners pre-pared for delivery just prior to closure shall be selected in accordance with Inspection Level I of MIL-STD-10S. The lot size for purposes of this inspectio
42、n shall be the number of shipping cont.ainers. The samples shall be examined for packaging, packing, marking, leakage, and workman ship. Any package having one or more defects shall be rejected. If the number of defective packages exceeds the Acceptable Quantity Level (AQL) of 4.0 percent defective
43、in accordance with MIL-STD-I05, the lot repre sented by the sample shall be rejected. 8 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-S- 853HtAS) 4.3.3.3 Con t a in e r fill. The s amp 1 e s i z e s h 0 J 1 bE de term i ned in accordance with I
44、nspection Level S-3 of MIL-STD-IOS except that the samp Ie size de i- i ved from rlIL STD= 105 sha 11 be rounded 0 f f to the next highest increment of five. At no time shall the sample size be less than f Vt:- j unless the lot consists of les lhan five containers in Whl ch all containers shall be u
45、sed to determine the fill. The sample unit shall be one filled container. The lot shall be rejected if the average content per container is less than that specified. 4.4 I I 1 1 Test conditions. Standard conditions. hereir: all mixing, and testing shall be and a relative humidity of 50S percent. Unl
46、ess otlterl;.ise specified performed at 251.1C (772F) 4.4.2 Mixing of type I componds. The base compound and its curing agent, hoth in the original unopened containers, together with the required spatulas, beakers, and other mixing equipment shall be held at standard condi tions (4.4. i) for a minim
47、um of b hours. The base compound and curing agent shall then be L _ .,_L_ _ : _ .l .:._ 1.-,. “L.- _ _ LIJOrouguJY lIIJxeu J1I L.1It: plVPVI-Proper care shall be taken to avoid incorporation of air by excessive stirring. The mixed material shall be degassed under vacuum. 4.4.3 Tha“-ing of type II co
48、n!pounds. The premixed, frozen cartrldges of type II compound shall be thawed in a 54.4C !2.7C (130 5F,1 water bath for 303 minutes and then placed at 251. 1C (772F) for lO 1 minuLes prior to testlng. 4.4.4 Mold ing and pot ting. tlo1ds for dis k spec imens and special shapes as indicat.ed in individual test descriptions shall be of polyethylene, polytetrafluoroethylene (PTFE) coat.ed metal, or coated with any other materIal having a nonadhesive s
