1、- ,- MIL-R-43742 40 7777706 0306779 5 MIL-R-43942 16 March i976 MILITARY SPECIFICATION ROPE, FIBROUS, POLYESTER/POLYPROPYLE!ZE DUAL FIBER This specification is approved for use by all Departments and Agencies of the Department of Defense. 1. SCOPE 1.1 Scope. This specification covers three strand, p
2、olyester/polypropylene 1.2 Classification. The polyester/polypropylene dual fiber rope shall be dud fiber rope. furnished in one type in the circumferance (size) as specified (see 6.2). 2. APPLICABLE DOCUMENTS 2.1 Issues of documents. The follotiing documents of the issue in effect on date of invita
3、tion for bids or request for proposal, form a part of this specification to the extent specified herein: SPECIFICATIOX? ZIEF! UU-T-81 - Tags, Shipping and Stock 14ILITA?.?Y MIL-C-3131 - Cordage; Preparation for Dslivery of STANDARDS FEDERAL FED-STD-191 - Textile Test Methods MIL IT AQY XIL-STD-105 -
4、 Sampling Procedures and Tables for Inspection by At tributes (Copies of specifications, standards and drawings required by contractors in connection with specific procurement functions should be obtainad from the procuring activity or as directed by the contracting officer.) FSC 40205 Provided by I
5、HSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,- _I- - - MIL-R-43742 40 D 0b OLObBOO MIL-R-43942 e 3. mQuIREEEIJTs 3.1 Fir.st article. laien specified (see 6.21, the contractor shall furnish a sample for first article inspection and approval (see 4.3 and C.4). 3.
6、2 Government or supplier purchases. The requirements specified in 3.9, 3.10 and 3.11 apply only to rope purchased directly by the Pavement. other requirem2nts apply to rope purchased as a conponent for an end item by a contractor and to rope purchased directly by the Government. All 3.3 Standard sam
7、ple. Eyed rope shall raatc:i the standard for shade and sliall be equal to or better than the standard sample t7ith respect to all characteristics for which the standard sample is referenced (see 6.3). 3 . 4 aterials . 3.4.1 Polyester. The polyester portion of the rope shall be bright, virgin, conti
8、nuous filament polyester filler of suitable tenacity to meet the require- ments of this specification. 3.4.2 Polypropylene. The polypropylene portion of the rope shall be virgin, continuous, nonofilament fibers and of suitable strength to neet all the require- nsats of this specification; a t;iiiilm
9、Um softening point of 300F and a specific gravity no greater than 0.91. and shall contain heat and ultraviolce light stabilizers. 3.4.2.1 Cover yams The polypropylene portion of these yarns shall be virgin, continuous, monofilanent fiber ranging in size from 100 to 200 denier per filament 3 . 4.2.2
10、Inside yarns. TIiese yarns shall be virgin continuous, nonof ilament or may be continuous slit or fibrillated fih polypropylene, and shall contain heat but not necessarily ultraviolet light stabilizers. 3.5 Construction. 3.5.1 a. The rope shall be three strand polyester/polypropylene and the lay of
11、the rope shall be right turn or “2“ lay. 3.5.2 Strands. The strands shdl be constructed as indicated below, 3.5.2.1 Cover yarns. The cover yarns shail be a combination of polyester over polypropylene and shall contain a minimum of 50 percent by weight of polyester fiber when tested as specified in 4
12、.4.5. to 2-1/4 inch circumference inclusive, each strand shall be made of either single ply or three ply yams, strand shall be made of three ply cover yarns. Por rope sizes fron 5/8 For rope sizes over 242 inches circumference, each Provided by IHSNot for ResaleNo reproduction or networking permitte
13、d without license from IHS-,-,-e e MIL-R-43742 40 7777706 0106801 T . MIL-R-43942 3.5.2.2 Inside yams. In rope sizes of 5/8 to 2-1/4 inch circumference, if one single yam is used inside, it shall be left (S) twist. 3.5.3 In the preparation of the constituent rope strands, the following shall apply:
14、(1) For ropes containing 3 ply cover yarns. Component Twist direction Singles yams 3 ply uarns Strands Rope (2) For ropes containing singles cover yarns. Component his t direction Singles inside yams Singles cover yams Strands .Rope 3.6 Physical requirements, The rope shall be of three strands and s
15、hall conform to the requirements specified in table I when tested as specified in 4.4.3. 3 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-R-43742 40 W 777770b OLObO2 L MIL-R-43942 TABLE I. Physical requirements . unit, but not less than 100 feet
16、 shall be subjected to the visual examination. The lot size for this examination shall be expressed,in units of reels, spools, or coils each. 4.0 total defects (major and minor conbined) per 100 units. shall be level I. Ten percent of the length contained on each sample The acceptable quality level
17、(AQL) shall be 1.5 major defects and The inspection level 8 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-R-43742 40 7797706 01106807 O m 14XL-R-4394 2 TABLE III. Visual examination defects Classification Examine Defect Xajor Minor Appearance a
18、nd Cut, any X workmanship Chafed or damaged x Kink, darting yarn &/ broken or loose end, bulged strand, strand knot, strand or yarn splice X Ends not cut off squarely X x Ends not securely whipped, taped Splice or otherwise secured to make or heat sealed a continuous length X Identification Color Om
19、itted, incorrect, or illegible , Insecurely attached or not as specified x X Not as specified I: Resists dyeing or spotty dyeing x x X Specific shade not within established Uneven tolerances X Cleanness Spot, or stain, clearly noticeable L/ c - i/ Darting yarn is an internal yarn which projects thro
20、ugh the surface of the strand. - 21 examination shall be one reel, spool, or coil. be level S-3 and the acceptable quality level shall be 4.0 percent defective. The lot size shall be the number of units in the inspection lot. shall be as listed in 4.4.3.1 and 4.4.3.2. The length of the reel, spool,
21、or coil (see table I and 3.10.1) shall be calculated using the following formula: At normd inspection distance (approximately 3 feet). 4.4.3 Examination for length and windine The sample unit for this The inspect3on level shall Defects W x L = Length per holder in feet there : i? is net weight of th
22、e rope in 0.1 pounds L is the lot average of the weight-length relationship (length pound). as determined in 4.4.5 9 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-_-_I_ - _-_ _- MIL-R-43942 i.10 999940b 01iObO8 2 MIL-R-43942 4.4.5.1 Defects with re
23、gard to length shall be considered to exist if any of the following are determined during inspection: a. Length of reel, spool less than specified. b Length of coil less than or more than length specified (including permitted tolerances) . C. Length of unit less than marked on ticker, d. Rope not in
24、 continuous length when coils are specified (see 3.3.0.1) e, 4.4.3.2 Defects with regard to w5nding shall be considered to exist if any Any piece on reels, spools less than 600 feet in length. of the following are determined during inspection: a. Improperly or not finnly wound resulting in kinks, kn
25、ots, entangling or slippage during unwinding or otherwise affecting free unhampered unwindins of rope. b. Knot or splice or otherwise joining of ends to make a continuous length. for dm. Packagins: packing and marking shall be inspected in accordance with the provisions of MIL-C-3131, except that th
26、e inspection level shall be S-2 and the acceptable quality level (AQL) shal be 2.5 defects per 100 units. 4.4.5 .F.-tlllll-PII_I-. Testing of the end -%* item. w- The methods of testing shaU be as specified in FED-STD-191, wherever applicable and as listed in table V. chemical values specified in se
27、ction 3 apply to the average of the determinations made on a sample unit for test purposes as specified in the applicable test methods. The sample size shall be in accordance with table IV. shal be one reel, spool, or coil of rope. units of one reel, spool, or coil. values utilized in expressing the
28、 final result. the lot shal be in accordance with table IV. with specification requirements, including quantity of delivery, may be made under prevailing atmospheric conditions. material which has reached equilibrium under standard conditions as defined in The physical and The sample unit for testin
29、g The lot size shall be expressed in All test reports shall contain the individual The acceptance or rejection of Tests to determine compliance In cases of dispute, tests shall be made upon PED-STD-191. 10 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-
30、,-,-NIL-R-LJ39LJ2 LJO W 9999906 01OhO9 4 MIL-R-43942 TABLE IV, Samjles for tests . I-.A -.-l.-IIIIII,dAX.II _II_.-1 “ .,.- -._L_-I_._ _I -“- _-_-. -_LI_ _LI_ “-.A -_.C. Number of coils, Acceptance No. Reject ion No. reels, spools, or No. of for each test for each test tubes in lot Samples characteri
31、s tic characteristic I-“ -_,_ *-.-.-“ Cut each cover yarn specimen to a minimum length of 10 inches and weigh to the nearest milliqram. Carefully separate the polyester multifilament yarn component from the tiolypropylene monofilament core yarn of the cut specimen by unvinding and weizh the Dolyeste
32、r portion separately to the nearest millipram. 4.4.5.1.2 Result. +4 &*_. the following equation: The, percentage of polyester fiber shall be based on 4.4.5.1.3 Five specimens shall be tested from each sample unit, and the polyester fiber component shall be the averaRe of the results obtained from th
33、e seecimens tested. percent. The results shall be reported to the nearest whole 4.4.5.2 Determination of shade (color) - _-.- matching. ._ rom shall match the standard sample under artificial daylight having a color temnerature of 7500“ Kelvin and shall be ood anmoximation to the standard samnle und
34、er incandescent lamtilight at 2800“ Kelvin (see 6.3). The shade of the dyed -&“- .- . ,. _-, 4.4.5.3 Determination _ _l.,._. of . _“ _*_ spliceabilitv. - A breakin? strength snecimen shall be prepared and spliced at each ena with four full tucks. The specimen shall then be allowed to rest for 24 hou
35、rs. Three of the tucks shall then be backed out of the rope. removed shall be examined or yarn displacement and strand cockles. That portion of the roge from which the tucks are 5, PACKACING 12 03 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-i- - MIL-R-43942 40 9949906 OLOb8LL 2 e 5.1.1 Levels - - 14 /- -) Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
