1、MIL-T-2WO 56 7777706 02LLt727 5 MIL-T-24708( SH) 29 July 1988 MILITARY SPECIFICATION THERMAL/ACOUSTIC INSULATION BARRIER MATERIAL: POLYIMIDE FOAM This specification is approved for use by the Naval Sea Systems Command, Department of the Navy, and is available for use by all Departments and Agencies
2、of the Department of Defense. 1. SCOPE 1.1 Scope. This specification covers lightweight, flexible polyimide foam as a layered thermal acoustic insulation barrier material developed for use within a specific frequency range on submarines. 1.2 Classification Type I: Polyimide foam composite layers wit
3、h vapor barrier, with unpainted glass cloth facing. Class Thickness (inches) Class 1 - single layer Class 2 - double layer Class 3 - triple layer 0.50 1 .o0 1.50 2. APPLICABLE DOCUMENTS 2.1 Government documents. 2.1.1 Specifications and standards. The following specifications and standards form a pa
4、rt of this specification to the extent specified herein, Unless otherwise specified, the issues of these documents are those listed in the issue of the Department of Defense Index of Specifications and Standards (DoDISS) and supplement thereto, cited in the solicitation (see 6.2). l. I Beneficial co
5、mments (recommendations, additions, deletions) and any pertinent data which may be of use in improving this document should be addressed to: Commander, Naval Sea Systems Command, SEA 5523, Department of the Navy, Washington, DC 20362-5101 by using the self-addressed - Standardization Document Improv
6、ement Proposal (DD Form 1426) appearing at the end of this document or by letter. AMSC N/A FSC 5640 DISTRIBUTION STATEMENT A. Approved for public release; distribution is unlimited. THIS DOCUMENT CONTAINS /o( PAGES. Provided by IHSNot for ResaleNo reproduction or networking permitted without license
7、 from IHS-,-,-SPECIFICATIONS FEDERAL PPP-B- 1955 PPP-F-320 MILITARY MIL-L- 19 140 MIL-C-20079 MIL-1-24688 STANDARDS FEDERAL FED-STD-313 - Barrier Material, Waterproofed, Flexible, - Fiberboard; Corrugated and Solid, Sheet Stock (Container Grade) and Cut Shapes. - Lumber and Plywood, Fire-Retardant T
8、reated. - Cloth, Glass; Tape, Textile Glass; and Thread, Glass and Wire - Reinforced Glass - Insulation Panel, Thermal and Acoustic Absorptive, Open-Cell Polyimide Foam. - Material Safety Data Sheets Preparation and the Submission of. MILITARY MIL-STD-2073-1 - DOD Materiel Procedures for Development
9、 and Application of Packaging Requirements. (Unless otherwise indicated, copies of federal and military specif i- cations and standards are available from the Naval Publications and Forms Center, ( ATTN : NPODS) , 580 1 Tabor Avenue, Philadelphia, PA 1 9 120-5099. ) 2.2 Non-Government publications.
10、The following documents form a part of Unless otherwise specified, the this document to the extent specified herein. issues of the documents which are DoD adopted shall be those listed in the issue of the DoDISS cited in the solicitation. the issues of documents not listed in the DoDISS are the issu
11、es of the documents cited in the solicitation (see 6.2). Unless otherwise specified, AMERICAN SOCIETY FOR TESTING AND MATERIALS (ASTM) C 177 - Standard Test Method for Steady-State Heat Flux Measurements and Thermal Transmission Properties by Means of the Guarded-Hot-Plate Apparatus. (DoD adopted) D
12、 2724 D 3951 - Standard Test Methods for Testing Bonded, Fused, and - Standard Practice for Commercial Packaging. Laminated Apparel Fabrics (DoD Adopted) E 162 - Standard Test Method for Surface Flammability of Materials Using a Radiant Heat Energy Source. (DoD adopted) (Application for copies shoul
13、d be addressed to the American Society for Testing and Materials, 1916 Race Street, Philadelphia, PA 19103.) t 2 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-T-24708 56 = 7779706 0234729 7 MIL-T-24708( SH) (Non-Government standards and other p
14、ublications are normally available These doc- from the organizations that prepare or distribute the documents. uments also may be available in or through libraries or other informational services.) 2.3 Order of precedence. In the event of a conflict between the text of this document and the referenc
15、es cited herein, the text of this specification shall take precedence, Nothing in this specification, however, supersedes applicable laws and regulations unless a specific exemption has been obtained, 3. REQUIREMENTS 3.1 First article. When specified (see 6.2), a sample shall be sub- jected to first
16、 article inspection (see 6.4) in accordance with 4.3. 3.2 Material. The basic material shall be flexible polyimide foam. 3.2.1 Type I barrier material shall consist of a composite of 0.5 inch flexible polyimide foam layers conforming to DOD-1-24688, type I. of flexible polyimide foam shall be bonded
17、 to a polyphosphazene/barium sulfate sheet weighing 30 f 10 percent ounces per square yard. barium sulfate sheet shall cover 100 percent of the polyimide foam surface. On the outer layer, a single glass cloth outer facing (see 3.3) shall be bonded to a polyphosphazene/barium sulfate sheet weighing 3
18、0 f 10 percent ounces per square yard. The layers The polyphosphazene/ 3.3 Glass cloth. Glass cloth shall be in accordance with type I, class 2 3.4 Form. The barrier material shall be furnished in sheets or molded of MIL-C-20079 or as approved by NAVSEA. shapes as specified by the contracting activi
19、ty (see 6.2). the contracting activity but shall not exceed 48 by 120 inches (see 6.2). 3.4.1 Sheets. Sheet dimensions and quantities shall be as specified by 3.4.2 Molded and pre-fabricated shapes. Molded and pre-fabricated shape forms and dimensions shall be as specified by the contracting activit
20、y (see 6.2). 3.5 Peel strength. The 180 degree peel strength between the fibrous glass cloth facing and the barium sulfate loaded polyphosphazene film to which it is bonded shall be as follows (see 4.5.1 ) : With web (oz/in) - 4 Across web (oz/in) - 2 3.5.1 Strength of adhesion. The bond strength be
21、tween the polyphos- phazene barium sulfate loaded film and the flexible polyimide foam shall exceed the adhesive strength of the flexible polyimide foam when tested as specified in 4.5.1.1. 3 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-T-2470
22、8( SH) O 3.6 Toxicitx. The material shall have no adverse effect on the health of personnel when used for its intended purpose (see 4.5.2). Questions perti- nent to this effect shall be referred by the contracting activity to the Commander, Naval Medical Command (MEDCOM-02) who will act as an adviso
23、r to the contracting activity# 3.7 Edge preparation. There shall be no adhesives or barrier treatments on the face of the vertical edges of the flexible polyimide foam between septum layers (see 4.5.3). 3.8 Fire resistance. Type I material shall have a flame spread rate of 25 or less and smoke devel
24、opment of 150 or less when tested as specified in 4.5.4. method in the Appendix. Type I class 3 materials shall also be tested in accordance with the Flashover time shall be greater than 10 minutes. 3.9 Insertion loss. The type I class 3 composite barrier material specified in 3.2.1 shall have an in
25、sertion loss of not less than 60 decibels (dB) when tested as specified in 4.5.5. verify compliance from random installed materials. Type 1, class 1 shall have an insertion loss of not less than 20 decibels and class 2 shall be not less than 40 decibels. The Government reserves the right to 3.10 Fle
26、xibilitx. The barrier material as specified in 3.4.1 shall show no visible damage, rupture or visible cracking when tested as specified in 4.5.6. 3.11 Thermal conductivity. When tested as specified in 4.5.7, the thermal conductivity, lKI1 expressed in B itish thermal unit-inches per square foot-hour
27、-degrees Fahrenhait Btu-in/( ft -hr-OF) I shall not exceed 0.29 at 75F for all classes. 5 3.12 Material safety data sheet. The contracting activity shall be provided a material safety data sheet (MSDS) at the time of the contract award, FED-STD-313. covered by this specification (see 6.6). The MSDS
28、shall bprovided in accordance with the requirements of The MSDS shall be included with each shipment of the material 4. QUALITY ASSURANCE PROVISIONS 4 I 1 Responsibility for inspection, Unless otherwise specified in the contract or purchase order, the contractor is responsible for the performance of
29、 all inspection requirements (examinations and tests) as specified herein. Except as otherwise specified in the contract of purchase order, the con- tractor may use his own or any other facilities for the performance of the inspection requirements specified herein, unless disapproved by the Govern-
30、ment. forth in this specification where such inspections are deemed necessary to ensure supplies and services conform to prescribed requirements. The Government reserves the right to perform any of the inspections set 4.1 . 1 Responsibility for compliance. All items shall meet all require- ments of
31、sections 3 and 5. shall become a part of the contractors overall inspection system or quality program. shall not relieve the contractor of the responsibility of ensuring that all The inspection set forth in this specification The absence of any inspection requirements in the specification Provided b
32、y IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-T-24708 5b 7777906 0214731 7 Test . MIL-T-24708(SH) Test paragraph products or supplies submitted-to the Government for acceptance comply with all requirements of the contract (see 6.3). the manufacturing ope
33、rations, is an acceptable practice to ascertain conform- ance to requirements, however, this does not authorize submission of known defective material, either indicated or actual, nor does it commit the Government to accept defective material. Sampling inspection, as part of 4.2 Classification of in
34、spection. The inspection requirements specified herein are classified as follows: (a) (b) First article inspection (see 4.3). Quality conformance inspection (see 4.4). 4.3 First article inspection. First article inspection shall consist of the examinations and tests specified in 4.3.1 and 4.5 (see 6
35、.3). 4.3.1 First article tests. Prior to production, first article tests shall be conducted on a sample to determine the conformance with all the tests and requirements herein (see 6.4). identical in composition and equivalent in manufacture to the material to be supplied later for quality conforman
36、ce inspection. The first article sample shall comply with all the requirements specified herein. The test material shall be certified to be 4.4. Quality conformance inspection. Quality conformance inspection shall be as specified in table I (see 6.3). 4.5 Peel strength Edges Flexibility 4.5.1 4.5.3
37、4.5.6 Test methods and procedures. 4.5.1 Peel strength. Peel strength shall be determined in accordance with ASTM D 2724 (see 3.5). 4.5.1.1 Strength of adhesion. The strength of adhesion shall be deter- mined by pulling/separating polyphosphazene barium loaded film from the flex- ible polyimide foam
38、 material and examining for compliance to 3.5.1. 4.5.2 Toxicological formulation. To determine conformance to require- ments of 3.2.1, the manufacturer of the compound shall disclose the formu- lation of this product to the Commander, Naval Medical Command (MEDCOM-02) Washington, D.C. 20372 for appr
39、oval. The disclosure of proprietary informa- tion, which shall be held in confidence by the Navy Medical Command, shall include the name, formula, and approximate percentage by weight and volume of each ingredient in the product; the results of any toxicological testing of 5 Provided by IHSNot for R
40、esaleNo reproduction or networking permitted without license from IHS-,-,-MIL-T-Zi70B 56 9999906 022L1732 9 W MI L-T-24708 (SH ) the product; and such other information as may be needed to permit an accurate appraisal of any toxicity problem associated with the handling, storage, application, use, d
41、isposal, or combustion of the material. 4.5.3 Edges. Type 1 composites shall be supplied with clean cut 90 degress vertical cut edges (see 3.7). 4.5.4 Fi.re resistance. Type 1 material shall be tested in accordance with ASTM E 162 as follows: (a) With the glass cloth cover facing the heat source. (b
42、) With the flexible polyimide foam facing the heat source. Type I material shall also be tested in accordance with the method in the Appendix . A minimum of 16 square feet (4 each 2 foot square) of composite barrier, type I class 1, 2 and 3 materials (specified in 3.2) shall be tested for insertion
43、loss (see 3.9). The tests shall be performed according to procedures and at facilities approved by NAVSEA. One layer of 1/2 inch thick barrier material, type I, class 1 as per installed configuration, 12 by 18 inches shall be cut and bent through an arc of 90 degrees on its 12 inch dimension over a
44、1-inch dia- meter mandrel. The mandrel shall be long enough to extend at least 2 inches beyond the ends of the test specimen, The specimen shall be maintained in the flexed position for 5 minutes before being released and then examined for compliance with 3.10. 4.5.5 Insertion loss. 4.5.6 Flexibilit
45、x. 4.5.7 Thermal conductivity. The thermal conductivity, “K“, of the thermal acoustic insulation barrier material shall be determined in the installed configuration and as specified in ASTM C 177 (see 3.11 ) . 4.6 $wpection of packagi,nq. Sample packages and packs, and the inspeo- tion of the preser
46、vation-packaging, packing and marking for shipment and and storage shall be in accordance with the requirements of section 5 and the documents specified therein . 5. PACKAGING (The packaging requirements specified herein apply only for direct Government acquisition. requirements of referenced docume
47、nts listed in section 2, (see 6.5). For the extent of applicability of the packaging 5.1, General 5.1.1 Navy fire-retardant requirements. (a) Treated lumber and plywood. Unless otherwise specified (see 6,2), all lumber and plywaod including laminated veneer material used in shipping containers and p
48、allet construction, members, blocking, bracing, and reinforcing shall be fire- retardant treated material conforming to MIL-L-19140 as follows : 6 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-T-24708 56 7997906 0234733 O MIL-T-24708( SH) Level
49、s A and B - Type II - weather resistant, Level C - Type I - non-weather resistant. Category 1 - general use. Category 1 - general use. (b) Fiberboard. Unless otherwise specified (see 6.2), fiberboard used in the construction of class-domestic, non-weather resistant fiberboard, cleated fiberboard boxes including interior packaging forms shall meet the flame spread index and the specific optic density requirements of PPP-F-320, 5.2 Preservation. Preservatio
