AIR FORCE MIL-S-8784 B-1971 SEALING COMPOUND LOW ADHESION FOR REMOVABLE PANELS AND FUEL TANK INSPECTION PLATES《MAU-50 A型飞机炸弹发射器机架》.pdf

1、MLLITARY SPECIFICATION SEALING COMPOUND, UN ADHESION, FOR PmIWABLF: PANELS AND FUEL TAIE IIISPEZTION PLATES . This specification has been approved by the Department of Defense and is mandatory for use by the Departments of the Am, the Navy, and the Air Force. 1. SCOPE 1.1 ScoDe. This specification c

2、overs two classes of accelerated synthetic rub- ber compounds for sealing access doors and accessories of integral fuel tanks, fuel cell cavities and accessories where gaskets are required. 1.2 Classification. The sealants shall be of the following classes, as specified (see 6.2) : Class A - Sew mat

3、erial suitable for brush application. Class B - Sealing material suitable for application by injection or extrusion gun and spatula. 1.2.1 Dash numbers. The following dash numbers shall be used to designate the rnmmum application time in hours. Class k dash numbers shall be -l/2, -2. Class B dash nu

4、mbers shall be -1/2, -2. EXAIPIE: Class A-2 shall designate a brushable material having 2 hours applica- tion time. Class B42 shall designate an extrusion-gun material having an application time of 1/2 hour. 2. APPLICABLE DOCIR.IIE;NTS 2.1 The following specifications and standards, of the issue in

5、effect on date of invitation for bids, form a part of this specification to the extent speci- fied herein: FSC 8030 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-* SPECJFICATIOMS 4 Federal TT-E-7 51 TT-N-97 TT-1-735 93-4-735 CCC-C-432 m-14-261 PPP-

6、B-636 PPP-C-96 Aluminum Alloy Alclad 7075, Plate Ethyl Acetate, Technical Methyl-Ethyl-Ketone, Technical Naphtha, Aromatic Isopropyl Alcohol Standard Test Fluids, Wocarbon Cloth, Cotton, Sheeting (Unbleached, Boxes, Fiber Cans, Metal, 28 Gage and Lighter and Sheet Bleached and Dyed) Hilitary “1-631

7、Insulation, Electrical, Synthetic Resin Composition, Nonrigid Materials in Semkits mL-P-387uC Packaging and Packing of Two Component STANDARDS Federal FED TEST IdETHOD STD NO. 601 Iiubber Sampling and Testing lUtarX EfLLSTD-105 Sampling Procedures and Tables for Inspection by Attributes 1nzsTD-lZ9 M

8、arking for Shipment and Storage (Copies of specifications, standards, drawings, and publications required by contractors in connection with specific procurement functions should be obtain- ed from the procuring activity or as directed by the contracting officer. ) 2.2 Other mblications. The followin

9、g documents form a part of this specifica- tion. Unless otherwise indicsted, the issue in effect on date of hitation for bids, shall apply. American Society for Testiw each sample filled container shall also be weighed to determine the amount of the contents. Any container in the sample havjng one o

10、r more defects or under required fill shall be rejected, and if the number of defective containers in any sample exceeds the acceptance number for the appro- priate sampling pLan of Standard “D-105, the lot represented by the sample shall be rejected. Rejected lots may be resubmitted for Acceptance

11、tests pro- vided the contractor has removed or repaired all nonconforming containers. 4.5.2 Nonvolatile content. From 5 to 10 grains of the mixed sealing compound shall be transferred as rapidly as possible to a cup approximately 3 inches in diameter and 3/4 inch in depth. A fitted cover shall immed

12、iately be placed over the cup and the weight determined accurately by using an enclosed beam balance which will weigh accurately to the nearest milligram. The cover shall then be removed and -the sealing compound heated for Zr, hours at 1580 2OF (?O0 k 1C). 7 Provided by IHSNot for ResaleNo reproduc

13、tion or networking permitted without license from IHS-,-,-The weight of the cup and cover 3haY be determined accurately before using and substracted from the initial and final weights. 4.5.3 .Viscositx. The viscosity shall be determjned after the sample has been stored at the proper temperature for

14、24 hours, thoroughly mixing the base com= pound by stirring, closing the container, and then allowing a l-hour rest period. A Brookfield Viscosimeter shall be used, and the readings shall be con- verted to poises. For Class A material, the No. 4 spindle shall be used at 10 rpu, and for Class B, the

15、No. 7 spindle shall be used at 2 rpm. The instru- ment shall be run for 1 minute before the first reading is made. 4.5.4 a. The flow test jig, as shown,in figure L, SN be placed on a table with the front face upward and with the plunger depressed to the limit of ibs travel. Fifty grams of the base m

16、aterial and the proper amount of curing compound shall be mixed, The compound shall be mixed on a flat included. Not more than 5 minutes shall be allowed for nrixing. Enough of the mixed sealant shall be transferred within 1 minute to fill the recessed cavity of the jig and leveled off even with the

17、 block. The jig shall be stood. on its end, and the plunger advanced to the limit of its forward travel within 5 seconds. The flow measurement shall be made when the sealant has cured. The flow shall be measured from the tangent to the lower edge of the plunger to the farthest point to which flow ha

18、s occurred. 4.5.4.1 This test and tests described in 4.5.5, 4.5.6, 4.5.7, and 4.5.8 shall be conducted on sealing compound mixed at the same time. 4.5.5 Resistance to .salt_water and ocarbo%Le at this temperature, one end of the test panel shall be put in the slotted position and the other end bent

19、rapidQ around the curved portion of the flexibility test jig with the sealant on the exterior of the radius. The panels shall then be removed and examined. 4.5.U Color, The sealant materials shall be examined visually for conformance to 3.2.1 5*1 Packaf?ing. Packaging shall be level A. Provided by I

20、HSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-1- FIIXJE 2. Low temperature fladbility test jig Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-with one base compound container in a manner that will prevent accid

21、ental sepa- ration but will permit easy separation for mixing purposes. The ratio of the quantity contained in base container to the quantity contained in the curing agent container shall be the same as the recomended mjldng ratio of the base compound and curing agent. 5.l.l.l.l Individual container

22、s. The base compound shall be furnished in l/2-pintj l-pint, l-quart, or 1-gallon metal cans, as specified in the contract or order. Metal cans shall conform to type V, class 2 of PPP4-96, excpt that tinplate cans with paper labels may be used, unless specifically prohibited. The base compound conta

23、ined in each size container shall be as follows: Size of container bunt of base comund Volume tolerance 6 fluid ounces I2 fluid ounces 24 fluid ounces 96 fluid ounces ?I 1/8 fluid ounce f 1/4 fluid ounce -f: 1/2 fluid ounce f 2 fluid ounces The air in the top of the base compound containers shall be

24、 replaced with nitro- gen gas immediately prior to closing the containers. The curing agent shall be furnished in glass jars or in suitable plastic containers approved by the pro- curing activity. The jars or plastic containers, as applicable, shall have vertical, smooth inside walls, and no interna

25、l projections or internal lips ex- ceeding 1/16 inch., The glass jars shall be closed with enameled metal or plas- tic continuous thread screw caps having a nonabsorbent lining material. -Caps shall be tightened adequately and further sealed with cellulose bands, or equiv- alent. One container each

26、of the base compounds and curing agent, individually packaged in accordance with the foregoing, shall be enclosed in a Grade W5C con- tainer conforming to PPP-B436 and shall constitute a complete kit. 5.1.1.1.2 Sectional-tme containers. The base compound and curing agent shall be furnished in high d

27、ensity polyethylene sectional-type 2-1/2 ounce or 6-ounce cartridges, conforming to MIL-P-387l.4, as specified in the contract or order. The total content of base compound and curing agent contained in each sectional- type container shall be as follows: Total content (base Size of container and curi

28、m) Volume tolerance 2 1/2 ounce 6 ounces 2 fluid ounces 5 l/8 fluid ounce 3 1/2 fluid ounces 2 l/8 fluid ounce 5.2 Packine(. Packing shall be level A or B as specified. 5.2.1 Level A. The sealing compound shall be packed in overseas-type shipping containers in accordance with the requirements of the

29、 appendix to PPP-C-96 for Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-U filled can containers, and MIL-P-387l4 for the sectional type con- tainers. 5.2.2 Level B. The sealing compound shall be packed in domestic-type shipping containers in accord

30、ance with the requirements of the appendix to PPP-C-96 for a filled can containers, and NIL-P-311, for the sectional type containers, 5.3 Marking of shipments. Interior packages and exterior shipping containers shall be marked in accordance with EIIL-P-38714 and “STD-129 as applicable. The identific

31、ation shall also include the stock number or other identification number as specified in the purchase document (see 6.2) . NOTE: The contractor shall enter the Federal Stock Number specFfied in the purchase document or as furnished by the procuring activity. When the Federal Stock Number is not prov

32、ided or available from the procuring activity, leave space therefor and enter the stock number or other identification as provided by the procuring activity. 6. NOTES 6.1 Intended use. The sealing compounds covered by this specification are intended for sealhg access doors and accessories of integra

33、l. fuel tanks, cell cavities, and components where a low adhesion sealing compound is re- quired. The sealant naterials are not intended for repair or sew the interior seams or fasteners of integral fuel tanks, bladder or self-sealing fuel cells. 6.2 Order* data. Frocuring documents should specify t

34、he following: Title,. number, and date of this specification Class of sealant, with dash number required Level of packaging and packing required (see section 5) Nethod of packaging a Required size of base compound container Federal Stock Number, Stock Number, and other identification required by the

35、 activity (see 5.3) 6.3 Marginal indicia. Margins of this specification are not marked with aster- isks to indicate where changes (additions, modifications, corrections, de- letions) from the previous issue were made, due to the extensiveness of the changes. 6.4 Waiver. The first article inspection

36、tests need not be repeated for new orders or follow on orders provided the materials and processes-have not been changed and a certified statement to this effect is furnishec.Bo the. pr&i.g. activity, .The waiving of the first artiele inspection tests will be strictly at the discretion of the procur

37、ing activity. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-F2,PAXIXG ACTIVITY: Air Force - $4 PT.OJZCT EO. 8030-0367 * U. S. GOVERNMENT PRINTING OFFICE 1971 -433-69719306 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-