NAVY MIL-M-18351 F-1981 MATTRESSES AND MATTRESS TICKS BERTH SYNTHETIC CELLULAR RUBBER NAVAL SHIPBOARD《海军军舰住舱合成多孔橡胶气垫和垫套》.pdf

《NAVY MIL-M-18351 F-1981 MATTRESSES AND MATTRESS TICKS BERTH SYNTHETIC CELLULAR RUBBER NAVAL SHIPBOARD《海军军舰住舱合成多孔橡胶气垫和垫套》.pdf》由会员分享，可在线阅读，更多相关《NAVY MIL-M-18351 F-1981 MATTRESSES AND MATTRESS TICKS BERTH SYNTHETIC CELLULAR RUBBER NAVAL SHIPBOARD《海军军舰住舱合成多孔橡胶气垫和垫套》.pdf（19页珍藏版）》请在麦多课文档分享上搜索。

1、I General Specifications ana Methods of Test- ing * CCC-C-436 - Cloth, Ticking Twill, Cotton. PPP-B-636 - Box, Shipping , Fiberboard. MILITARY MIL-F-10884 - Fasteners, Snap. MIL-R-20092 - Rubber Sheets and Assemblea and Molded Shapes, Cellular * Synthetic Open Cell (Foamea Latex). STANDARDS FEDERAL

2、FED-STD-191 - Textile Test Methods. FED-STD-751 - Stitches, Seams, ana Stitchings. MIL ITA RY MIL-STD-1 O5 - Sampling Procedures and Tables for Inspection MIL-STD-129 - Marking for Shipment and Storage. by Attributes. (Copies of specifications, stanaaras, drawings, ana publications re- qufred by con

3、tractors in connection with specific acquisition functions should be obtained from the Contracting activity or as directea by the contracting officer .I 2.2 Other publications, The following aocuments form a part of this specification to the extent specified herein. Unless otherwise indi- Catea, the

4、 issue in effect on date of invitation for bids or request for proposal shall apply. NATIONAL MOTOR FREIGHT TRAFFIC ASSOCIATION, INC. AGENT National Mo tor Freight Cl assi f ication (Application for copies shoula be addressed to the National Motor Freight Traffic Association, Ino., ATA TRAFFIC Dept,

5、 1616 “Pif Street, N.W., Washington, DC 20036,) 2 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-M-L351F 72 iB 7779706 0237778 4 E M IL-M - 1 83 5 1 F ( S H UNIFORM CLASSIFICATION COMMITTEE AGENT Uniform Freight Classification Ratings, Rules and

6、 Regula- tions (Application for copies should be addressed to the Uniform ClasSifiCa- tion Conitnittee Agent, Tariff Publication Officer, Room 1106, 222 South Riverside Plaza, Chicago, IL 60606; 1 (Technical society ana technical association specifications and stand- ards are generally available for

7、 reference from libraries. They are also distributed among technical groups and using Federal agencies.) 3. REQUIREMENTS 3.1 First article. When specified (see 6.2.1). the contractor shall furnish unit(s) for first article inspection and approval (see 4.2 and 6.3). 3.2 Construction. 3.,2.1 Mattress

8、inserts. 3.2.1.1 Mattress inserts shall be constructed of synthetic cellular rubber conforming to type I or type II, class 5, medium firm conaition of MIL-R-20092. Mattress inserts may be molded in one piece, or may be assembled by laminating ta achieve thickness, and by butting to achieve width or

9、length. However, not more than four butt joints per mattress shall be permitted; two along the width, and two along the length. When type II inserts are used, the test requirements and test methods of type I shall apply. 3.2.1.2 All uncored surfaces shall have a flat surface. An accept- able coring

10、arrangement is shown on figure 1. Alternate methods of coring which will produce the same compression ratio and not exceed the maximum weight specified in table I will be acceptable. Where laminated assembly is employed to achieve thickness of type I material, mattress inserts shall be assembled wit

11、h the cored surfaces cemented together. 3.2.1.3 All 12 edges of the mattress shall be covered with a fire- resistant, pressure-sensitive adhesive tape, 2 inches wide, in accordance with 3.2.3. The tape shall be centered on each edge. 3.2.1.4 The mattress insert shall be sized by the manufacturer so

12、that the mattress tick will fit as required by 3.2.5, and the complete unit (mattress insert and tick) will comply with the sizes specified in table I. 3 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-ML-H-18351F 72 94306 0234779 b W I FIGURE 1. Cor

13、e arrangement. I LENGTH c NOTE: This figure shows an acceptable coring arrangement (see 3.2.1) St i0424 3.2.2 Allowable manufacturing practices. Defects in mattress inserts which occur incident to Standard manufacturing practices ana assem- bly will be allowed if they are corrected as inaicatea, and

14、 the resulting product conforms to this specification. 3.2.2.1 Molded mattress inserts. The following repairs will be acceptable for molded mattress inserts: (a) Surface tears ana tears extenaing between core holes where no material is missing shall be cementea. The total accum- ulative length of su

15、ch cemented tears shall not exceed SO lineal inches per mattress. For type I1 material, tears shall not exceed 50 inches on either side of the mattress. 4 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-M-L35LF 72 W 7779706 0237780 2 (b) Not more

16、 than six core post replacements (areas between (cl Set-in repairs: core holes) per mattress. 3 - each set-in of 48 square inches (max). 2 - each set-in of 72 square inches (max). 1 - each set-in of 144 square inches (max). (d) Edge repairs: Edgerepairs of 64 square inches or less which do not exten

17、d more than 8 inches from the edge and not more than 4 such repairs per mattress. An edge is described as being the full thickness of the mattress and not just the angular corner. 3.2.2.1.1 The total accumulative area of the repairs listed in 3.2.2.1(c) and (d) shall not exceed 10 percent of the sur

18、face area of each side (length by width) of the mattress. 3.2.2.2 Laminated mattress inserts. The following repairs will be acceptable for laminated mattress inserts: All repairs to laminated mattress inserts shall be accomplished prior to assembly of the laminae into the finished product. (a) Set-i

19、n repairs to individual lamina: 3 - each set-in of 48 square inches (max) per mattress. 2 - each set-in of 72 square inches (max) per mattress. 1 - each set-in of 144 square inches (max) per mattress. total accumulative length of such cementea tears shall not exceed 50 lineal inches per mattress, in

20、cluding tears between core holes in type I material. or removed material shall be repaired/or replaced with material identical to the base material. Edges of the patching inaterial shaIl be cemented to the base material with an overlap so that the cemented joint will demon- strate adhesion between t

21、he scrim surfaces greater than that between the scrim and the cellular rubber. (b) Tears where no material is missing shall be cemented. The (c) Where scrim reinforcing is damaged or removed, such damaged 3.2.3 Tape. 3.2.3.1 Fire performance. The tape shall not exhibit an average afterflame of more

22、than 6.0 seconds nor an average char length in excess of 2-1/2 inches. No one specimen shall have an afterflame greater than 10 seconds, when tested in accordance with 4.4.1.4. 3.2.3.2 Adhesive strength. Adhesive strength of the tape shall be not less than 10 ounces per inch of width, when tested in

23、 accordance with method 100 of UU-P-31. 3.2.3.3 Tearing strength. Tape shall have a tearing strength of not less than 12 ounces when tested in accordance with method 5134 of FED-STD-191. Dimensions of the specimens shall be 2 inches by 8 inches, 3.2.3.4 Breaking strength. Tape shall have a breaking

24、strength of not less than 26 pounds per inch in the lengthwise direction, when tested in accordan6e with method 5102 of FED-STD-191. 5 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-M-iI351F 72 M 9999906 0239781 4 W I 3.2.5 Mattress tick. 302.3.

25、5 Thread count, Tape shall have a thread count of 30 threads per inch in both the warp and filling directions, when tested in accord- ance With method 5050 of FED-STD-191. 3.2,4 Cement bond. Cement used to adhere the various sections of cellular rubber or reinforcing scrim shall form a bond stronger

26、 than the adjoining rubber, when separated by hand. Also, cemented seams shall be Soft and similar to the rest of the rubber, so that they cannot be felt with the flat of the hana. 3.2.5.1 Tick for the mattress inserts shall be fabricatea of treated Cotton in accordance with type II, class 2, of CCC

27、-C-436. Tick shall be Of box construction fabricated from five separate sections: top; bottom: two SaeS and one end. The other end shall be left open for the insertion and removal of mattresses. The open end shall have two flaps, one attachea to the top section and one to the bottom section of the t

28、ick. Each of the two flaps shall be constructed with a piece of tick folaed in half with faces together, the ends stitched in accordance with class SSa-1 of FED-STD-751, and turned inside out. The outer edges shall be stitched with a 1/8 inch margin. The flaps shall be attached to the top ana bottom

29、 sections with an LSq-2 class seam in accordance with FED-STD-751. 3.2.5.2 End flaps shall be securable by at least four snap fasteners conforming to style 3, finish 1, of MIL-F-10884. The outer snaps shall be 1 inch amplin article inspection. First article inspection saal1 consist of the following:

30、 (a) Ena item (see 4.3 and 4.4). (b) Components (see 4.5 ana table III). The first ai-ticle is defined as Seing tile first proauction line item. 4.2.1 First article inspection report. The contractor shall furniah a first article incjpection report in accordance with tbe aata oraering ciocment inclua

31、ea in the contract (see 6.2.2). 4.3.2 Sampling for visual, airnensional, ana weight examination. Ranaom samples of complete mattresses (incluaing tick), type ana size as requrea (see 6.2.11, shall be selectea from each lot offerea for exami- nation in accoraance with MIL-STD-105. For visual examinat

32、ion, Inspection 8 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-M-18351F 72 E 7777706023778 T E Level II and an Acceptable Quality Level (AQL) of 2.5 percent defective for major defects and 6.5 for minor defects shall apply. For measurement of

33、mattress inserts and the weighing and measurement of the end item, the inspection level shall be S-3 and the AQL 4.0 percent defective for each examination. Thickness of samples submitted for examination shall be the same thickness a8 the mattresses being acquired. Each item in the sample shall be i

34、nspected for .the critical characteristics identified in table II. In the event that any items Qf the sample do not meet the specified requirements, the entire lot shall be rejected. 4.4 Visual, .dimensional, and weight examination. Each of the sample finished mattresses selected in accordance with

35、4.3.2 shall be carefully examined to determine conformance with the requirements of this specifica- tion. Measurements of weight and dimensions shall be made as specified in 4.4.1. The tick shall then be removed from each sample mattress and the synthetic rubber mattress inspected. When acceptable t

36、o the inspector and expedient for the manufacturer , an intermediate examination of the completed foam rubber inserts would preclude the removal of the mattress tick for the above examination. This intermediate examination does not prevent the inspector from requesting the ticks to be removed during

37、 final examination when desired. 4.4.1 Methods of measurements. 4.4.1.1 Weight. Weight shall be determined under prevailing atmos- pheric conditions. In the settlement of disputes, the weight of the mattress and tick shall be determined after having been brought to equili rium with an atmosphere hav

38、ing a relative humidity of 65 f 2 percent and equilibrium, when successive weighings made at intervals of 1 hour are not greater than 0.25 percent. I a temperature of 75OF f 5OF. The material shall be considered to be in 3- 4.4.1.2 Thickness. Thickness shall be taken as the average of measurement at

39、 each of the four corners of a finished mattress, complete with tick. 4.4.1.3 Length and width. Length and width shall be taken as the average of three measurements in each direction on a finished mattress complete with tick. 4.4.1.4 Flame/glow propagation and char length. Flame/glow propa- gation a

40、nd char length shall be determined by method 5903 of FED-STD-191, except that the metal specimen holder shall have dimensions to accommodate a 2-inch by 12-inch specimen so as to leave a center strip 1-1/2 inches Wide exposed to the flame. The specimen shall be prepared by bonding the adhesive surfa

41、ce of one piece of tape to the adhesive surface of a similar piece of tape, with both pieces having identical dimensions of 2 inches by 12 inches. Bonding shall be effected by applying a uniform pressure to the entire specimen upon a level surface. 4.4.2 Classification of defects. Classification of

42、defects shall be conducted as specified in table II (see 4.3.2 for inspection levels and AQLs) . O 9 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-M-I351F 72 749770b 0237785 I MIL-M-18351 F (SHI TABLE II. Classification of defects in accoraance

43、 with MIL-STD-105. Categories Critical : -I- 1 2 Major: 101 102 103 104 105 106 107 108 109 110 111 11s 113 Material not as specified. Butt joints exceeding permittea number (see 3.2.1) . MATTRESS INSERTS ( Ce1 lu1 ar rubber ) Any unrepaired , damaged reinforcing scrim, Has objectionable Odor. Voids

44、, uncorea surfaces: (A voia shall be considered a small crater on an otherwise smooth surface of the uncored surface of the mattress. It should not be confused with the minute pin holes of a sunburst area. These pin holes shall not exceed 1/16 inch in diameter with no limit on their depth .) a. Any

45、void or surface tear (material missing) 1/4 inch through 3/8 inch aeep and more than 1/2 square inch area, length or projecting more than 3/8 inch into a plane . b. Any void over 3/8 inch deep. c. Any void on an eage or corner over 3 inches in Skin, loose, greater than 2 inches in aiameter. More tha

46、n two tloose skintf areas, regaraless of size, per Low core area: Any, exceeding 1/4 inch in aepth, Shrinkage mark over 1/8 inch in aepth, Tape omitted . Any of the 12 taped edges showing lack of adhesion com- mattress. pletely across the tape for a distance exceeding 2 inches; that is, extenaing fr

47、om one side eage of the tape to the opposite side edge of the tape. Repaired surface not level.!./ or not neatly accomplished Any alteration not levell/ or neatly accomplished , Material used in alteration not same as basic latex mater- Uncemented tears (a tear shall be consiaered as such when a. Mo

48、re than two 1/8-inch through 1/4 inch in depth in any 2 foot square area. b. More than one over 1/4 inch in aepth but not ex- ceeding 1/2 inch in depth, in any 1-foot square area. than 1/2 inch in depth. surfaces) three or more inches in length. ial . it extends through the entire wall separating co

49、re holes). C. More than three total per mattress, extenaing more 4. ncementea surface tear (sides, ends, and uncored Se footnote at end of table. 10 o Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-a a .a MIL-M-L835LF 72 E 9999906 0239786 3 W TABLE II. Classification of defects in accordance with MIL-STD-105. - Continued Categories Major: - Continued 114 115 116 117 118 119