1、 INCH-POUND MIL-PRF-24172B (SH) 27 September 2004 SUPERSEDING MIL-I-24172A (SH) 19 November 1986 PERFORMANCE SPECIFICATION INSULATION, PLASTIC, CELLULAR FOAM, RIGID, PREFORMED AND FOAM-IN-PLACE This specification is approved for use by the Naval Sea Systems Command, Department of the Navy, and is av
2、ailable for use by all Departments and Agencies of the Department of Defense. 1. SCOPE 1.l Scope. This specification establishes the requirements for a rigid cellular foam material. 1.2 Classification. Foam is of the following types and classes, as specified (see 6.2): Type I - Preformed Class 1 - 1
3、.7 to 2.5 pounds per cubic foot density Class 2 - 2.5 to 4.0 pounds per cubic foot density Type II - Foam-in-place Class 1 - 1.7 to 2.5 pounds per cubic foot density Class 2 - 2.5 to 4.0 pounds per cubic foot density 2. APPLICABLE DOCUMENTS 2.1 General. The documents listed in this section are speci
4、fied in sections 3, 4, or 5 of this specification. This section does not include documents cited in other sections of this specification or recommended for additional information or as examples. While every effort has been made to ensure the completeness of this list, document users are cautioned th
5、at they must meet all specified requirements of documents cited in sections 3, 4, or 5 of this specification, whether or not they are listed. 2.2 Government documents. Comments, suggestions, or questions on this document should be addressed to Commander, Naval Sea Systems Command, ATTN: SEA 05Q, 133
6、3 Isaac Hull Avenue, SE, Stop 5160, Washington Navy Yard DC 20376-5160 or emailed to commandstandardsnavsea.navy.mil, with the subject line “Document Comment“. Since contact information can change, you may want to verify the currency of this address information using the ASSIST Online database at ww
7、w.dodssp.daps.mil AMSC N/A FSC 5640 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-24172B (SH) 2 2.2.1 Specifications, standards and handbooks. The following specifications, standards, and handbooks form a part of this document to the extent
8、 specified herein. Unless otherwise specified, the issues of these documents are those cited in the solicitation or contract. DEPARTMENT OF DEFENSE SPECIFICATIONS MIL-PRF-16884 - Fuel, Naval Distillate. (Copies of these documents are available online at http:/assist.daps.dla.mil/quicksearch or www.d
9、odssp.daps.mil or from the Standardization Document Order Desk, 700 Robbins Avenue, Building 4D, Philadelphia, PA 19111-5094.) 2.2.2 Other Government documents, drawings, and publications. The following other Government documents, drawings, and publications form a part of this document to the extent
10、 specified herein. Unless otherwise specified, the issues of these documents are those cited in the solicitation or contract. BUREAU OF MEDICINE AND SURGERY (BUMED) BUMED INST 6270.8 - Procedures for Obtaining Health Hazard Assessments Pertaining to Operational Use of a Hazardous Material. (Copies o
11、f this document are available online at https:/bumed.med.navy.mil or from Bureau of Medicine and Surgery, Department of the Navy, 2300 E Street, NW, Washington, DC 20372-5300.) NAVAL SEA SYSTEMS COMMAND (NAVSEA) S9510-AB-ATM-010 Rev 2 of 30 July 1992 - Nuclear Powered Submarine Atmosphere Control Ma
12、nual. (Copies of this document are available from the Naval Sea Systems Command, Code SEA 05Z9, 1333 Isaac Hull Avenue, SE, Stop 5133, Washington Navy Yard DC 20376-5133.) 2.3 Non-Government publications. The following documents form a part of this document to the extent specified herein. Unless oth
13、erwise specified, the issues of these documents are those cited in the solicitation or contract. AMERICAN SOCIETY FOR QUALITY (ASQ) ASQC Z1.4 - Sampling Procedures and Tables for Inspection by Attributes. (DoD adopted) (Copies of this document are available from www.asq.org or American Society for Q
14、uality, 600 North Plankinton Avenue, Milwaukee, WI 53203.) ASTM INTERNATIONAL C 177 - Heat Flux Measurements and Thermal Transmission Properties by Means of the Guarded Hot Plate Apparatus, Steady-State. (DoD adopted) C 203 - Insulation, Thermal Block Type, Breaking Load and Flexural Properties of.
15、(DoD adopted) D 618 - Standard Practice for Conditioning Plactics for Testing. (DoD adopted) D 1621 - Plastics, Rigid Cellular, Compressive properties of. (DoD adopted) D 1622 - Plastics, Rigid Cellular, Apparent Density of. (DoD adopted) D 2842 - Water Absorption of Rigid Cellular Plastics. (DoD ad
16、opted) D 2856 - Plastics by the Air Pycnometer, Rigid Cellular, Open Cell Content of. (DoD adopted) Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-24172B (SH) 3 E 84 - Surface Burning Characteristics of Building Materials. (DoD adopted) E 96
17、 - Water Vapor Transmission of Materials. (DoD adopted) (Copies of these documents are available from www.astm.org or ASTM International, 100 Barr Harbor Drive, West Conshohocken, PA, 19428-2959.) 2.4 Order of precedence. In the event of a conflict between the text of this document and the reference
18、s cited herein, the text of this document takes precedence. Nothing in this document, 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 subjected to first article inspectio
19、n in accordance with 4.2. 3.2 Material. The basic ingredients used to formulate type I material and the components for type II material shall be such that all the requirements of this specification are fulfilled. The insulating material used in this plastic material shall be free of tolyene diisocya
20、nate, moca, trimethylol propane and pentaerythritol. 3.2.2 Recycled, recovered, or environmentally preferable materials. Recycled, recovered, or environmentally preferable materials should be used to the maximum extent possible provided that the material meets or exceeds the operational and maintena
21、nce requirements, and promotes economically advantageous life cycle costs. 3.3 Color. Unless otherwise specified (see 6.2), the color of the foamed material shall be the color of the product as normally manufactured. 3.4 Uniformity. Type I material, and type II material when prepared as specified in
22、 4.5.2.2, shall be homogeneous throughout and firm in composition. There shall be no blowholes greater than 1/2-inch in diameter or large accumulations of unexpanded resin or other large occlusions. 3.5 Property values. Types I and II materials shall conform to the property values shown in Table I w
23、hen tested as specified. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-24172B (SH) 4 TABLE I. Type I and type II property values. Inspection Requirement Density, apparent Class 1 - 1.7 to 2.5 pounds per cubic foot Class 2 - 2.5 to 4.0 pound
24、s per cubic foot Compressive strength at yield point or 10 percent deflection Class 1 - Minimum of 20 lb/in2 in the direction of the rise of the foam Class 2 - Minimum of 40 lb/in2 in the direction of the rise of the foam Fire resistance, droplets before and after exposure to 4.5.10, specimen thickn
25、ess 1 inch (nominal) Flame spread 25 (max)1 Smoke developed 250 (max) No melting, dripping or flaming Unicellularity 10 percent maximum open cells Thermal conductivity (K factor) 0.16 Btu-in/hr ft 2 F maximum Resistance to oil No evidence of attack (softening, swelling or dissolving) Heat aging Maxi
26、mum of 3 percent volume change Humid aging Maximum of 3 percent change in each linear dimension Water absorption 0.08 pounds average per square foot of cut surface Water vapor transmission Maximum of 2.0 perm inches Flexural strength Maximum of 40 lb/in2 Low temperature aging Maximum volume change o
27、f plus or minus () 4 percent No cracking 1 Not to be construed as a fire hazard classification. Refers to test method only. 3.6 Dimensional form and tolerances (type I). The preformed board shall have dimensional uniformity with square corners and sides, and ends shall be parallel. The length, width
28、 and thickness of the board shall be as specified (see 6.2) with the following tolerances: Length - Plus 1/16 minus 0 inch per linear foot. Width - Plus 1/16 minus 0 inch per linear foot Thickness - Up to and including 2 inches, 1/32 inch. Greater than 2 inches, 1/16 inch. 3.7 Foam-in-place (type II
29、). Prior to production, the foam system shall be tested as specified. 3.7.1 Cure temperature. The foam shall cure at ambient temperature as specified (see 6.2 and 6.3) and attain the physical properties described herein within 48 hours after mixing. 3.7.2 Component ratio. The volume ratio between co
30、mponents for producing the required foam shall be a maximum of five to one. 3.8 Workmanship. The preformed foam (type I) and the component ingredients for the foam-in-place (type II) shall be processed in such a manner as to be uniform in quality and shall meet the requirements specified herein, as
31、applicable, and shall be free from other defects that will affect life, serviceability or appearance. 3.9 Toxicity. The insulation shall have no adverse effect on the health of personnel when used for its intended purpose. The insulation shall be assessed by the Navy Environmental Health Center (NAV
32、ENVIRHLTHCEN) using the administrative Health Hazard Assessment (HHA). A flowchart for this process can be found as enclosure (1) of BUMEDINST 6270.8. The HHA is a review of the insulation based on information submitted by the manufacturer, to assess health hazards associated with the handling, appl
33、ication, use and removal of the product. The insulation shall not cause any environmental problems during waste disposal (see 4.6 and 6.6). Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-24172B (SH) 5 3.10 Off-gassing. The insulation shall m
34、eet the requirements in the Nuclear Powered Submarine Atmosphere Control Manual, NAVSEA Technical Manual S9510-AB-ATM-010 Rev 2, for a usage category of Limited (see 4.7 and 6.7). 4. VERIFICATION 4.1 Classification of inspections. The inspection requirements specified herein are classified as follow
35、s: a. First article inspection (see 4.2) b. Conformance inspection (see 4.3) 4.2 First article inspection. Prior to production, first article inspection shall be conducted on a sample to determine conformance with all the requirements and tests herein. The test material shall be identical in composi
36、tion and equivalent in manufacture to the material to be supplied later for conformance inspection. The first article sample shall comply with all the requirements specified herein. 4.3 Conformance tests (type II only). Conformance tests shall be conducted to determine conformance to all of the spec
37、ified tests and requirements of this specification, except fire resistance (4.5.5), toxicity (4.6) and off-gassing (4.7). Sufficient quantities of foam ingredients shall be taken to produce at least six sample test blocks as specified in 4.5.2. When a temperature range for mixing and foaming the bas
38、e ingredients is specified (see 4.5.2.2, 6.2 and 6.3) three test blocks of foam shall be prepared at each specified temperature. Conformance tests are not required for foam formulations previously supplied under contract which have been tested and found to conform to this specification, provided tha
39、t no changes have been made in the test mold (see 4.5.2.1), materials, material production techniques, formulation, mixing instructions and handling characteristics (see 4.5.2.2, 6.2 and 6.3) in the foam formulation subsequent to these tests. 4.4 Sampling. 4.4.1 Lot. For purposes of sampling, a lot
40、shall consist of all material from one production batch offered for delivery at one time. 4.4.2 Sampling for visual dimensional examination (type I only). A random sample of preformed boards shall be selected from each lot offered for Government inspection in accordance with ASQC Z1.4 at inspection
41、level II. The acceptable quality level (AQL) shall be no defects. Major and minor defects shall be as specified in ASQC Z1.4. 4.4.3 Sampling for quality conformance inspection. 4.4.3.1 Type I only. From each lot (see 4.4.1) sufficient samples shall be prepared from separate boards selected at random
42、 and tested as specified in 4.5.3 through 4.5.14. If any of the samples tested is found to be not in accordance with this specification, this shall be cause for rejection of the entire lot represented by the sample. 4.4.3.2 Type II only. Two containers of resin shall be selected at random from each
43、lot (see 4.4.1). A 2-quart sample shall be taken from each of the two containers, placed in separate clean, dry, metal or glass containers and sealed and marked. Containers from which the samples have been removed shall be re-padded with dry nitrogen and sample containers shall also be padded with d
44、ry nitrogen. In a similar manner samples of curing agent, in quantities proportional to the resin as designated by the contractors foaming instructions, shall also be selected, packaged, and marked. Containers from which the curing agent samples have been removed shall be re-padded with dry nitrogen
45、 and sample containers shall also be padded with dry nitrogen. The selected samples shall be foamed, prepared and then tested as specified in 4.5.3 through 4.5.14. 4.5 Test methods. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-24172B (SH)
46、6 4.5.1 Test conditions. Unless otherwise specified (see 6.2), the atmospheric conditions surrounding the specimen prior to and during the test shall be 73.4 3.6 degrees Fahrenheit (oF) (23 1 degrees Celsius (oC) and 50 2 percent relative humidity. The conditioning period prior to the test shall be
47、a minimum of 24 hours. 4.5.2 Preparation of sample block (type II only). 4.5.2.1 Sample mold. Sample test molds shall be constructed in accordance with either 4.5.2.1.1, 4.5.2.1.2 or 4.5.2.1.3 as specified (see 6.2). 4.5.2.1.1 Steel. The mold shall be constructed of 1/8-inch thick steel. It shall co
48、nsist of a steel box without a top and having inside dimensions of 13 inches in each direction. The bottom shall be removable and provided with devices for securing it to the sides. On the outside of each of two opposite sides a steel flange, 13 inches in length and 2 inches in width, shall be firml
49、y attached at the midpoint of the outside surface with 13-in dimension parallel to the top and bottom surfaces of the box. The inside surfaces shall be dry and clean. A mold release agent may be used. 4.5.2.1.2 Plywood. The mold shall be constructed identical to that of 4.5.2.1.1, except that 1/2-inch thick plywood shall be used as the construction material. 4.5.2.1.3 Special test mold. When a special test mold is required for a specific application, thickn
