1、INCH-POUNDMIL-PRF-121G30 April 2001SUPERSEDINGMIL-B-121F16 June 1989PERFORMANCE SPECIFICATIONBARRIER MATERIALS, GREASEPROOF, WATERPROOF,FLEXIBLE, HEAT-SEALABLEThis specification is approved for use by all Departments and Agencies of the Departmentof Defense.1. SCOPE1.1 Scope . This specification est
2、ablishes the requirements for heat-sealable, greaseproof,waterproof, flexible barrier material used for the preservation of military supplies and equipment(see 6.1).1.2 Classification . The barrier materials will be of the following types as specified(see 6.2):Type I - Medium dutyType II - Light dut
3、y2. APPLICABLE DOCUMENTS2.1 General . The documents listed in this section are specified in sections 3 and 4 of thisspecification. This section does not include documents cited in other sections of this specificationor recommended for additional information or as examples. While every effort has bee
4、n made toensure the completeness of this list, document users are cautioned that they must meet allspecified requirements documents cited in sections 3 and 4 of this specification, whether or notthey are listed.Beneficial comments (recommendations, additions, deletions) and any pertinent data whichm
5、ay be of use in improving this document should be addressed to: Commander, Naval AirWarfare Center Aircraft Division (Code 414100B120-3), Highway 547, Lakehurst, NJ08733-5100 by using the Standardization Document Improvement Proposal (DD Form 1426)appearing at the end of this document or by letter.A
6、MSC N/A FSC 8135DISTRIBUTION STATEMENT A . Approved for public release; distribution is unlimited.Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-121G22.2 Government documents .2.2.1 Specifications and standards . The following specifications
7、 and standards form a partof this document to the extent specified herein. Unless otherwise specified, the issues of thesedocuments are those listed in the issue of the Department of Defense Index of Specifications andStandards (DoDISS) and supplement thereto, cited in the solicitation (see 6.2).STA
8、NDARDSFEDERALFED-STD-101 - Test Procedures for Packaging Materials.(Unless otherwise indicated, copies of the above specifications and standards are availablefrom the Standardization Document Order Desk, 700 Robbins Avenue, Building 4D,Philadelphia, PA 19111-5094.)2.3 Non-Government publications . T
9、he following documents form a part of this documentto the extent specified herein. Unless otherwise specified, the issues of the documents which areDoD adopted are those listed in the issue of the DoDISS cited in the solicitation. Unlessotherwise specified, the issues of documents not listed in the
10、DoDISS are the issues cited in thesolicitation (see 6.2).AMERICAN SOCIETY FOR QUALITY CONTROL (ASQC)ASQC-Z1.4 - Procedures, Sampling and Tables for Inspection byAttributes. (DoD adopted)(Application for copie s should be addressed to the American Society for Quality Control,P.O. Box 3005, 611 East W
11、isconsin Avenue, Milwaukee, WI 53201-4604.)AMERICAN SOCIETY FOR TESTING AND MATERIALS (ASTM)ASTM-D471 - Rubber Property-Effect of Liquids (DoD adopted)( Application for copies should be addressed to the American Society for Testing andMaterials, 100 Barr Harbor Dr., West Conshohocken, PA 19428-2959.
12、)TECHNICAL ASSOCIATION OF THE PULP AND PAPER INDUSTRY (TAPPI)TAPPI-T403 - Bursting Strength of Pape rTAPPI-T404 - Tensile Breaking Strength and Elongation of Paper and Paperboard (Using Pendulum-type Tester).Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IH
13、S-,-,-MIL-PRF-121G3TAPPI-T414 - Internal Tearing Resistance of Paper (Elmendorf-type Method).(Application for copies of the above specifications are available from the TechnicalAssociation of the Pulp and Paper Industry, Technology Park/Atlanta, P.O. Box 105113,Atlanta, GA 30348.)2.4 Order of preced
14、ence . In the event of a conflict between the text of this document andthe references cited herein, the text of this document takes precedence. Nothing in thisdocument, however, supersedes applicable laws and regulations unless a specific exemption hasbeen obtained.3. REQUIREMENTS3.1 First article .
15、 When specified (see 6.2), a sample shall be subjected to first articleinspection in accordance with 4.2.3.2 Material . Barrier materials shall be made from such materials and by such processes asto ensure compliance with the performance requirements of this specification.3.3 Construction . The barr
16、ier materials shall be constructed of one or more plies in anymanner that ensures compliance with the performance requirements of this specification.3.3.1 Splices . A roll shall not contain more than 2 splices (3 pieces). Splices within rollsshall be even, extend the entire width of the roll, and sh
17、all not come apart during unwinding ofthe roll. Splices shall be flagged at both ends of each splice with colored markers.3.4 Form . The barrier material shall be furnished in rolls.3.4.1 Rolls . Unless otherwise specified (see 6.2), the width of roll material shall be 36inches, with a tolerance of
18、plus 1/4 inch or minus 1/8 inch. The average length of roll materialshall be not less than 200 yards. The length of any individual roll shall be not less than 195 yards.The roll material shall be uniformly wound on non-returnable cores. The cores inside diametershall be not less than 3 inches, with
19、a tolerance of plus 1/8 inch. The length of the core shall beequal to the width of the roll material, with a tolerance of plus 1/8 inch. The core shall be rigid toprevent distortion of the roll during use and shipment conditions. Each roll shall be restrained toprevent unwinding (see 4.3.2.1).3.5 Se
20、aling . The material shall exhibit no delamination of the heat-sealed area when sealedaccording to the manufacturers recommended conditions (see 4.5). Each roll of barrier materialshall include a tag secured to the roll core with the sealing instructions for heat-sealing oncontinuous and jaw-type se
21、aling equipment. The tag shall be visible upon opening the unitpackage (see 4.3.2.1).Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-121G43.6 Identification of material . The specification number, type, manufacturers name,manufacturers design
22、ation, month and year of manufacture, and lot number shall be clearly andlegibly marked using water-resistant ink on the backing surface of the material. The color of themarkings shall be red. This complete group of markings shall be continuous lengthwise and thedistance between groups of markings s
23、hall be not greater than 6 inches. A complete group ofmarkings shall appear once in each 12 inches of width of the roll. The letters and figures shall benot less than 1/8 inch high (see 4.3.2.1).3.7 Workmanship . Barrier material surfaces shall be free from any foreign matter. Thebarrier material ed
24、ges shall be cut and trimmed of any selvage. Barrier material shall be freefrom holes, tears, cuts, sharp creases, wrinkles, or other imperfections (see 4.3.2.1).3.8 Performance requirements . The performance of the barrier materials shall meet therequirements specified in table I, when tested in ac
25、cordance with 4.6.TABLE I. Performance requirements .PROPERTY REQUIREMENTTESTPARAGRAPHREFERENCESeam Strength1. As received material sealed each one containing a complete set of markings selectedfrom different rows of markings.3 / Test shall be run on five specimens. The heat-sealable face of the bar
26、rier material shall be incontact with the probe. The average value for the five specimens tested shall meet therequirements listed in table I. Elongation test data is not required.4 / Th ree specimens shall be tested. Specimens shall not be suspended but shall be placed on ahorizontal test surface f
27、or 24 hours.5 / Three specimens shall be tested. If corrosion is evident in the blank area, the test shall berepeated with a new test panel. Corrosion in the intermediate area shall not invalidate the testnor be cause for rejection.6 / Five of the ten specimens in each direction shall be tested with
28、 one face toward the knife andthe remaining specimens shall be tested with the opposite face toward the knife.4.6.2 Seam strength .4.6.2.1 Seam strength sampling . Samples measuring 6 by 12 inches shall be selected fromthe test material as shown on figure 1.4.6.2.2 Seam strength as received .4.6.2.2
29、.1 Preparation of test specimen . The six sections for this test (see figure 1) shall befolded in half with the crease parallel to the long axis. The open or unfolded length shall beheat-sealed by clamping in the sealer and simultaneously drawing a sharp-penciled line on thebacking along the edge of
30、 the sealer jaw. The folded length shall be cut off 1/2 inch from theProvided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-121G8end. From each of the six sections, three adjacent 1-inch-wide specimens shall be cutperpendicular to the seam (see 4.5)
31、. One of the specimens from each section shall be tested atroom temperature (see 4.4), one from each section tested at 100 F, and the remaining one fromeach section tested at 160 F. After heat-sealing and prior to the application of the specifiedweights, the specimens in all cases shall be exposed f
32、or one hour to the test conditions specifiedin 4.4.3 1 22132 3 11321 2 3321KEY1 6 inch by 12 inch sample for “As Received“ testing2 6 inch by 12 inch sample for “Sealed Before Aging“ testing3 6 inch by 12 inch sample for “Sealed After Aging“ testingFIGURE 1. Sampling method for seam strength test .M
33、ACHINEDIRECTIONOF ROLLProvided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-121G94.6.2.2.2 Test at room temperature . The six 1-inch-wide specimens selected for this test(see 4.6.2.2.1) shall be opened and one end of each specimen shall be clamped
34、so that the otherend of the specimen hangs freely. A 3-1/2 pound weight shall then be carefully attached to thefree end of the specimen so as not to impact load the seal. The weight shall be allowed to act for5 minutes, whereupon the weight shall be removed, and the specimen examined for separation
35、ofthe heat-sealed faces. Any evidence of delamination of one ply away from the other in theheat-sealed area shall be cause for rejection. The evaluation shall be limited to the heat-sealedarea specified in 4.6.2.2.1.4.6.2.2.3 Test at 100 F . The six 1-inch-wide specimens selected for this test (see
36、4.6.2.2.1)shall be tested the same as those specimens tested at room temperature (see 4.6.2.2.2) except thatspecimens shall be clamped in a forced draft circulating air oven maintained at 100 2 F with aweight of 2 pounds 1/2 ounce acting on the free end of the specimen for 1 hour. The rate of aircir
37、culation shall be held to the minimum required to maintain uniform temperature throughoutthe oven. In no case shall the rate of air circulation cause any movement of the weightedspecimens. The weights shall be attached after the specimens and test clamp fixtures have beenplaced in the oven. The weig
38、hts shall be removed prior to taking the specimen from the oven inorder to avoid excessive loading due to swaying action. After one hour, the weights shall beremoved and the specimen examined for separation of the heat-seal faces. Any evidence ofdelamination of one ply away from the other in the hea
39、t-sealed area specified in 4.6.2.2.1 shall because for rejection.4.6.2.2.4 Test at 160 F . The six 1-inch-wide specimens selected for this test (see 4.6.2.2.1)shall be tested the same as those at 100 F (see 4.6.2.2.3) except that the weight shall be10 ounces 1/2 ounce and the temperature in the forc
40、ed draft circulating air oven shall be160 2 F. The rate of air circulation shall be held to the minimum required to maintain uniformtemperature throughout the oven. In no case shall the rate of air circulation cause any movementof the weighted specimens.4.6.2.3 Seam strength sealed before aging .4.6
41、.2.3.1 Test specimens . The six sections for this test (see figure 1) shall be folded in halfwith the crease parallel to the long axis. The open or unfolded length shall be heat-sealed byclamping in the sealer and simultaneously drawing a sharp-penciled line on the backing along theedge of the seale
42、r jaw. The folded length of the test section shall then be cut off 1/2 inch fromthe end. After heat-sealing, the samples shall be aged in a circulating air oven maintained at 160 2 F for 12 consecutive days (288 hours). After aging, 1-inch-wide specimens, as specified in4.6.2.2.1, shall be cut from
43、the sections for test at room temperature, 100 F, and 160 F.4.6.2.3.2 Test at room temperature . The six 1-inch-wide specimens selected for this test(see 4.6.2.3.1) shall be tested as specified in 4.6.2.2.2.Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS
44、-,-,-MIL-PRF-121G104.6.2.3.3 Test at 100 F . The six 1-inch-wide specimens selected for this test (see 4.6.2.3.1)shall be tested as specified in 4.6.2.2.3.4.6.2.3.4 Test at 160 F . The six 1-inch-wide specimens selected for this test (see 4.6.2.3.1)shall be tested as specified in 4.6.2.2.4.4.6.2.4 S
45、eam strength sealed after aging .4.6.2.4.1 Test specimens . The six sections for this test (see figure 1), in the flat unsealedcondition as taken from the sample roll, shall be aged in a circulating air oven maintained at160 2 F for 12 consecutive days (288 hours). After removal from the oven the un
46、sealedsections shall be returned to room temperature. Test specimens shall then be obtained asspecified in 4.6.2.2.1.4.6.2.4.2 Test at room temperature . The six 1-inch-wide specimens selected for this test(see 4.6.2.4.1) shall be tested as specified in 4.6.2.2.2.4.6.2.4.3 Test at 100 F . The six 1-
47、inch-wide specimens selected for this test (see 4.6.2.4.1)shall be tested as specified in 4.6.2.2.3.4.6.2.4.4 Test at 160 F . The six 1-inch-wide specimens selected for this test (see 4.6.2.4.1)shall be tested as specified in 4.6.2.2.4.4.6.3 Aging resistance . Three specimens, 36 by 6 inches, cut fr
48、om across the roll ofmaterial, at points which shall be not less than 1 yard apart, shall be used for this test.4.6.3.1 Procedure . The specimens shall be subjected to the following aging cycle:8 hours in a humidity chamber at 100 2 F and 90 to 95 percent RH, followed by16 hours in a circulating air
49、 oven at 160 2 F.The aging cycle shall be repeated every weekday for five consecutive days. The specimens shallremain in the circulating air oven at 160 2 F on Saturday, Sunday, and holidays, except thatholidays shall not exceed a total of two days over the entire aging period. The aging procedureshall continue for fourteen consecutive days. The specimens shall be folded loosely, hung, rolledloosely, or laid flat in the te
