1、MIL-C-17435C 4 March1976 SUPERSEDING 2 May 1955 MIL-C-17435B MILITARY SPECIFICATION CUSHIONING MATERIAL, FIBROUS GLASS s specification is approved for use by all departments and agencies of the Department of Defense. 1. SCOPE 1.1 Scope. This specification covers cushioning material composed of bonde
2、d fibrous glass. 1.2 Classification. The cushioning material shall be of the following types and classes as specified (see 6.3) : Type I - Uncoated Type II - Coated. Classes shall be as indicated in table II. 2. APPLICABLE DOCUMENTS * 2.1 The following documents of the issues in effect on date of in
3、vitation for bids or request for proposals form a part of this specification to the extent specified herein. Issue of documents. SPECIFICATIONS Federal *O - M- 2 32 *P-D-680 -/- Methanol (Methyl Alcohol). Dry Cleaning Solvent *QQ-A-250/4 Aluminum Alloy 2024, Plate and Sheet ru -=- -._,-+- THIS DOCUM
4、EgT CONTAliYS f I PAGES. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-*QQ- C - 5 76 Copper Flat Products with Slit, Slit and Edge-Rolled, Sheared, Sawed or Machined Edges (Plate, Bar, Sheet, RR-S-366 Sieve, Test “MMM-A-260 Adhesive, Water-Resistan
5、t (For Sealing Waterproofed Paper) “PPP- B-585 Boxes, Wood, Wirebound *PPP-B-591 Boxes, Shipping PPP - B-60 1 Boxes, Wood, Cleated-Plywood *PPP-B-621 Boxes, Wood, Nailed and Lock-Corner * PP P.- B - 6 36 Boxes, Shipping, Fiberboard MIL-STD-129 Marking for Shipment and Storage I I (Copies of specific
6、ations, standards, and .drawings zequirec contractors in connection with specific procurement functions should be I obtained from the procuring activity or as directed by the contracting I r- Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-C-1743
7、5C 1 W 9997706 0282343 7 MIL-C-17435C 3. REQUIREMENTS 3.1 Materials. The cushioning material shall consist of glass fibers matted, bonded, and otherwise treated to meet the requirements of this specification for the type and class specified. The surface fibers of type II material shall be coated wit
8、h an elastomeric material to prevent dusting, by the procuring activity. When required, a backing material shall be applied as specified 3.1.1 Fiber size and orientation. Unless otherwise specified, the glass fibers shall be oriented in a direction approximately perpendicular to the direction of loa
9、ding of the cushioning material, the range of fiber diameters shall be as specified by the procuring activity (see 6.3). When required, 3.2 Forms and dimensions. Unless otherwise specified (see 3,2.1), fibrous glass cushioning material shall be furnished in sheet form, or in rolls when feasible, in
10、the standard thicknesses shown in table I, and in lengths and widths specified by the procuring activity. lengths of sheets and on widths shall be *1/4 inch. Tolerance on lengths of rolls shall be k1.5 percent. Tolerances on TABLE I. Standard thicknesses. ! Thickness (inch) Tolerance (inch) 1/4 +O ,
11、031 1/2 tr ,062 3/4 f ,062 1 f ,062 3.2.1 Special forms and dimensions. When specified by the procuring activity, cushioning material cut or molded to special forms, thicknesses, or other dimensions shall be furnished. Tolerances shall be as indicated in the applicable drawings or other documents. 3
12、.3 Load-deflection values. The fibrous glass cushioning material shall have the load-deflection properties shown in table II and 3.3.1, Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-C-17435C MIL-Cl37435C BL 979990b 0282342 9 W TABLE II. Load-de
13、flection values. Class Load range at 25% deflect i on (psi) O 2-0.5 0.5-1.5 1 ,o-2 ,o 2.0-4.0 3.0-8.0 6 $0-15 low20 20-50 50-100 Maximum test deflect ion (%I 60 55 50 50 45 40 35 35 30 Load range at maximum test deflection (Psi 0.5-3.0 2.0-12 5 ,O-15 10-25 15 -30 25-50 40-80 45 -90 50-120 3.3.1 Over
14、load. When tested as specified in 4.4.4.4, the redetermined load shall be within 15 percent of the original load required to produce the maximum test deflection value indicated in table II for the class of material tested. 3.4 Compression set. After compression to the maximurn test deflection shown
15、on table II (see 4.4.5) corresponding to the class of material, the cornpression set after 48 hours shall not exceed 5.0 percent of the original thickness. 3.5 Load-deflection at 250 F.l At a temperature of 250 1: 5 F, the load (see 4.4.6) required to produce the maximum test deflection shown in tab
16、le II for material of the corresponding class shall be at least 50 percent of the load for the same deflection at room temperature, 3.6 Compression set at 250 F.l The material, when tested as specified in 4.4.7 at a temperature of 250“ 1: 5“ F, using deflection values one-half as great as the maximu
17、m test deflections for the corresponding class in table II, shall show a compression set not exceeding 5 percent of the original thickness. 3.7 Accelerated aging. After heating as Specified in 4.4.8 for 15 hours at 300 1: 10 F, then testing at room temperature as in 4.4.4.4, the loads required to pr
18、oduce the maximum test deflections shown in table II shall be within 5 percent of the original loads. INot applicable for Air Force purchases. 4 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-C-17935C 41 9999706 0282193 O W MI L-C- 17435C 3.8 Du
19、sting. When tested as specified in 4.4.9, the weight loss for type I material shall not exceed 0.25 percent of the original weight of the sample. 0.05 percent, and the surface coating shall show no separation from the fibers, For type II material the weight loss shall not exceed 3.9 Flame resistance
20、, When tested as specified in 4.4.10, the material shall not support combustion after removal from the flame. A glow is permitted for not more than 15 seconds thereafter. * 3.10 Metal corrosion. inen tested as specified in 4.4.11, specimens of steel, copper, and aluminum alloy in contact with the cu
21、shioning material shall show no more corrosin than the control specimens. - 3.11 Water resistance. The binder shall not dissolve in distilled water, and the cushioning material shall retain its original shape and form after removal from water, when tested as specified in 4.4.12. 3.12 Workmanship. Cu
22、shioning material shall be manufactured in accordance with the highest standards of workmanship. The material shall be as uniform as commercially possible and shall be practically free of irregularities, loose or unbonded fibers, nonfibrous glass, or other occlusions. 4. QUALITY ASSURANCE PROVISIONS
23、 * 4,l Responsibility for- inspection. Unless otherwise specified in the contract or purchase order, the contractor is responsible for the performance of all inspection requirements as Specified herein. Except as otherwise specified in the contract or order, the contractor may use his own or any oth
24、er facilities suitable for the performance of the inspection requirements specified herein, unless disapproved by the Govern- ment. 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 se
25、rvices conform to prescribed requirements. * 4.2 Sampling. 4.2.1 Lot. For sampling purposes, a lot shall consist of all - cushioning material of the same type and class offered for delivery at the same time. 5 i - Y Provided by IHSNot for ResaleNo reproduction or networking permitted without license
26、 from IHS-,-,-4,2,2 Samples, Five pieces, 12 inches square, or the equivalent in molded or spe-cia1 forms, shall be selected from each lot. Where the sizes and forms are not suitable for preparation of test specimens, sufficient material representative of the lot shall be furnished in a form suitabl
27、e for such preparation. 4,3 Inspection, * 4,3,1 Visual and dimensional inspection. The samples shall be examined for compliance with the requirements of 3.1 to 3,2,1, 3.12, and section 5. 4,4 Test procedures. 4.4.1 Test conditions. Unless otherwise specified by the procuring activity, tests and meas
28、urements shall be at a room temperature of 70 to 90“ F, at least 24 hours and tested at 73,5 f 2 F and relative humidity of 50 k 4 percent. In case of dispute, the material shall be conditioned for 4,4,2 Thickness. The thickness of sheet material shall be determined by means of a dial micrometer, sh
29、all be at least 2 inches in diameter. shall be 1,129 inches I: 0,005 inch in diameter and loaded so as to exert a force of 1 i 0,05 ounce on the specimen, presser foot shall be parallel within 0,001 inch, shall be lowered gradually, without shock, and allowed to settle for 5 seconds before taking a
30、reading, 2 inches from the edge of the sheet, shall be taken and the average used in determining cornpliance with table I. The anvil for supporting the specimen The micrometer presser foot Surfaces of the anvil and The micrometer foot At least 5 readings, all at least 4.4.3 Lengths and widths, Lengt
31、hs and widths of sheet shall be measured to an accuracy of 1/64 inch, measured to the nearest inch. Lengths of rolls shall be 4.4.4 Load-deflection and overload. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-4.4.4.2 Testing machine. Any compression
32、 testing machine accurate to +1 percent of the load-to be measured may be used, 4.4.4.3 Micrometer. A dial micrometer accurate to 0.001 inch shall be attached to the machine so as to indicate the actual distance between the surfaces of the specimen under test. 4.4,4.4 Procedure. The specimen shall b
33、e compressed to the 25 percent and “maximum test“ deflection values indicated in table II for the proper class, and each load recorded. using a load equal to twice that for the maximum test deflection, release of this load, the load for the maximum test deflection shall be redetermined and compared
34、with the original load. The specimen shall then be overloaded, After 4.4.5 Com?xression set, 4.4.5.1 Specimens. The specimens shall be similar to those used for the load-deflection tests (4.4.4). At least three specimens shall be tested and the average value used to determine compliance. 4.4.5.2 Pro
35、cedure. The thickness of the specimen shall be measured as in 4,4.4.3. test deflection corresponding to its class as given in table II and shall remain compressed for 48 hours. and the thickness redetermined after 1 minute, be calculated as a percentage of the original thickness as follows: The spec
36、imen shall then be compressed to the maximum The load shall then be released Compression set shall Compression set, % = to - ti x 100 to . where t = final thickness to = original thickness, 4.4.6 Load-deflection at 250 F. The loads required to produce the maximum test deflections of table II shall b
37、e determined as in 4.4.4, using an insulated apparatus to maintain the specimen at 250 f 5 F for at least 15 minutes before and during the test, 7 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-HIL-C-L7q35C BL H 9997906 0282LLib b MIL- C- 174 35C 4.
38、4.7 Compression set at 250 F. Compression set shall be determined in the apparatus used in 4.4.4. The deflection shall be one-half of that of the maximum test deflection used in the room temperature test, and the specimen shall remain under compression for 2 hours at 250 k 5“ F. The load shall then
39、be released and the cpecmen allowed to cool for 15 min- utes at room temperature before remeasuring the thickness. value for at least three specimens shall be determined. Compression set at 250 F shall be calculated as in 4,4,5.2, The average 4.4.8 Accelerated aging, Specimens similar to those used
40、in 4,4.4 shall be stored for 15 hours in an oven at 300“ t: 10“ F, allowed to cool for 2 hours at room temperature, and then tested as in 4.4.4. 4,4.9 Dusting, A test specimen 2 inches square and not less than 1/2 inch thick shall be weighed to the nearest 0,001 gram, after particles resulting from
41、cutting have been removed. 0.75 IC 0,Ol pound, 1.375 inches k 0,005 inch in diameter shall be dropped squarely upon the test specimen from a height of 10 inches above its top surface, using a pipe or tube of slightly larger diameter as a guide, After a total of 10 such impacts the specimen shall be
42、cleaned with a brush, reweighed to the nearest 0,001 gram, and the percentage loss calculated. A cylindrical weight of 4.4.10 Flame resistance. One end of a specimen at least 1/4 inch thick by 1/2 inch wide by any convenient length shall be held for 1 minute in a bunsen burner flame 1 inch high, wit
43、hin a draft-free enclosure, and then observed for compliance with 3.9. * 4.4.11 Metal corrosion, * 4,4.11.1 Test specimens. Two test specimens, approximately 0,020 nch by 1 inch by 4 inches, of each of the following shall be used: . Steel : MIL-S-18729, cold-rolled, No. 3-quarter-hard temper, dull f
44、inish, Copper: QQ-C-576, cold-rolled, light temper. Aluminum alloy: QQ-A-250/4, temper T-3. * 4.4.11.2 Preparatioa of test specimens. The test specimens shall first be polished by means of a fine abrasive cloth to remove any rust 8 .: . Provided by IHSNot for ResaleNo reproduction or networking perm
45、itted without license from IHS-,-,-I MIL-C-17435C 1 777770b 0282347 8 or discoloration, then cleaned by means of a dry-cleaning solvent, P-D- 680, and rinsed in methanol, 0-M-232, Unless placed under test immedi- ately, the specimens shall be stored in a desiccator. l I * 4.4.11.3 Test Drocedure . F
46、or each of the 3 metals. one soecimen 1/2 inch by 1 inch by 4 inches in size. by means of twine or tape so as to maintain close contact with the metal. The other specimen of each metal shall be used as the control. specimens shall be suspended vertically in an atmosphere of 65 1 5 per- cent relative
47、 humidity at a temperature of 120 t_ 3 F for 96 hours, after which they shall be examined for compliance with 3.10. metals in contact with the cushioning material shows appreciably greater corrosion than the control specimen, this shall be cauce for rejections. The cushioning shall be seiked All If
48、any of the - ,a _I in distilled water for 6hourc at a temperature of-70“ $: 5 F, and then examined for compliance with 3.11. * 5. PACKAGING 5.1 Packinp. Unless otherwise coecified. cushionine material shall sheets, Suitable blocking, bracing, and cushioning shall be provided to prevent movement with
49、in the boxes. Special forms shall be wrapped to prevent injury or abrasion. 5,l. 1 For domestic chiDrnent . immediate use. Containers shall comnlu with the carrier regulations applicable- t the mode of transportation, cleated plywood, nailed wood, wire-bound wood, corrugated fiber, or solid fiber boxes conforming to PPP-B-591, PPP-B-601, PPP-B-621, PPP-B-585, or PPP
