1、.- o e e c MIL-P-24249A 999990b llb4bb2 Olb I INCH-POUND I MIL-P-24249A( SH) 20 Julv 1922 SUPERSEDING 10 February 1967 MIL-P-24249( SHIPS) MILITARY SPECIFICATION PLASTIC MATERIAL, CELLULAR POLWRETIIANE, RIGID, VOID FILLER, FOAM-IN-PLACE, LARGE SCALE AND INSTALLATION OF This specification is approved
2、 for use by the Naval Sea Systems Command, Department of the Navy, and is available for use by all departments and agencies of the Department of Defense. 1. SCOPE 1.1 Scope. This specification covers a resin material and installation system which, after mixing and installation in a void, will form a
3、 rigid, foam-in-place type unicellular urethane foam. 2. APPLICABLE DOCUMENTS 2.1 Government documents. 2.1.1 Specifications and standards. The following specifications and standards form a part of this document to the extent specified herein. Unless otherwise specified, the issues of these document
4、s 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). SPECIFICATIONS MILITARY MIL-T-5624 MIL-1-45208 Inspection System Requirements Turbine Fuel, Aviation, Grades JP-4 and JP-5 Benefici
5、al comments (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, Attn: SEA 5527, 2S3 1 National Center Bidg. 3, Washington, DC 20362-5 1Hl by using the self-addressed Standardizatio
6、n Document Improvement Proposal (DD Form 1426) appcaring at thc end of this document or by letter. AMSC NIA FSC 9330 DISTRIBUTION STATEMENT A. Approved for public relcase; distribution is unlimited. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL
7、-P-24249A m 9779906 LLbYbb3 T52 m MIL-P-24249A(SH) STANDARDS . FEDERAL FED-STD-3 13 Material Safety Data Transportation Data and Disposal Data for Hazardous Materials Furnished to Government Activities MILITARY MIL-STD- 105 Sampling Procedures and Tables for Inspection by Attributes (Unless otherwis
8、e indicated, copies of federal and military specifications and standards are available from the Naval Publications and Forms Center, (ATIN: NPODS), 5801 Tabor Avenue, Philadelphia, PA 19120-5099.) 2.1.2 Other Government documents. The following other Government document forms a part of this document
9、 to the extent specified herein. Unless otherwise specified, the issue is that cited in the solicitation. DEPARTMENT OF TRANSPORTATION (DOT) Code of Federal Regulations (CFR) 49, Parts 171-179 - Rules and Regulations for the Transportation of Explosives and Dangerous Articles (The Code of Federal Re
10、gulations are available from the Superintendent of Documents, U.S. Government Printing Office, Washington, DC 20402.) 2.2 Non-Government publications. The following documents form a part of this document to the extent specified herein. Unless otherwise specified, the issues of the documents which ar
11、e DOD adopted are those listed in the issue of the DODISS cited in the solicitation. Unless otherwise specified, the issues of documents not listed in the DODISS are the issues of the documents cited in the solicitation (see 6.2). AMERICAN NATIONAL STANDARDS INSTITUTE (ANSI) 2129.1 Hazardous Industr
12、ial Chemicals - Precautionary Labeling (DOD adopted) (Application for copies should be addressed to the American National Standards Institute, 1430 Broadway, New York, NY 10018.) 2 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-a e a MIGP-24249A( SH
13、) AMERICAN SOCIETY FOR TESTING AND MATERIALS (ASTM) C 273 D 1621 D 1622 D 1623 D 2126 D 2842 D 2856 D 3951 F 501 Standard Test Method for Shear Properties in Flatwise Plane of Flat Sandwich Constructions or Sandwich Cores (DOD adopted) Standard Test Method for Compressive Properties of Rigid Cellula
14、r Plastics (DOD adopted) Standard Test Method for Apparent Density of Rigid Cellular Plastics (DOD adopted) Standard Test Method for Tensile and Tensile Adhesion Properties of Rigid Cellular Plastics (DOD adopted) Standard Test Method for Response of Rigid Cellular Plastics to Thermal and Humid Agin
15、g (DOD adopted) Standard Test Method for Water Absorption of Rigid Cellular Plastics Standard Test Method or Open Cell Content of Rigid Cellular Plastics by the Air Pycnometer (DOD adopted) Standard Practice for Commercial Packaging (DOD adopted) Standard Test Method for Aerospace Materiais Response
16、 to Flame, with Vertical Test Specimen (for Aerospace Vehicles Standard Conditions) (Application for copies should be addressed to the American Society for Testing and Materials, 1916 Race Street, Philadelphia, PA 19103.) (Non-Government standards and other publications are normally available from t
17、he organizations that prepare or distribute the documents. These documents also may be available in or through libraries or other informational services.) 23 Order of precedence. In the event of a conflict between the text of this document and the references cited herein, the text of this document t
18、akes precedence. Nothing in this document, however, supersedes applicable laws and regulations unless a specific exemption has been obtained. 3. REQUIREMENTS 3.1 Qualification. Plastic materiais furnished under this specification shall be products which are authorized by the qualijing activity or li
19、sting on the applicable qualified products list at the time o award of contract (see 4.3 and 6.4). Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-NIL-P-24249A I 999990b llb4bb5 825 MIL-P-24249A( SH) 3.2 Materials. 3.2.1 Toxic or hazardous materiais.
20、 Isocyanate fumes may be present when the foam is prepared (see 3.5). The ingredients used in this plastic material shall be free of both trimethylopropane and pentaerythritol (see 6.3). 3.2.2 Material safety data sheet (MSDS). The contracting activity shall be provided a material safety data sheet
21、at the time of contract award. The MSDS shall be provided in accordance with the requirements of FED-STD-313. The MSDS shall be included with each shipment of the material covered by this specification (see 6.7). 33 Physical characteristics. 33.1 Ingredients. When mixed in accordance with the operat
22、ing instructions and automatic dispensing equipment specified by the contractor (see 6.5), the ingredients shall form a rigid unicellular urethane foam for the intended application. The foam shall air cure at ambient temperature, the minimum of which may be specified (see 6.2), and shall attain the
23、physical properties specified in 3.4 within 7 days after mixing. 33.2 Foamed material. 33.2.1 Quantity per single pour. The automatic dispensing equipment used shall dispense foam at a rate as specified (see 6.2 and 6.5). 33.2.2 Uniformity per single pour. The cured material shall be essentially hom
24、ogeneous (uniform physical properties) throughout, and firm in composition with small, uniform cells. There shall be no large void openings (over li2 inch in any direction), large accumulations of unexpanded resin, or other occlusions (see 4.62). 33.23 Odor. The cured material shall be free from any
25、 objectionable odor, particularly residual isocyanate fumes. 3.4 Physlcal property values. The foam material shall conform to the property values specified in 3.4.1 through 3.4.9. 3.4.1 Density. The foamed block shall have a maximum density of 6.4 pounds per cubic foot (see 4.6.3). 3.4.2 Compressive
26、 strength. The compressive strength of the foamed block per endicular to compressive strength parallel to foam rise shall be a minimum of 80 Ib/in2. Following both the humid aging test and the oil resistance test, compressive strength (perpendicular to foam rise) shall be greater than 60 but less th
27、an 130 lb/in2 (see 4.6.4). foam rise shall be greater than 60 but less than 130 pounds per square inch (Ib/in 5 ), while the 4 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-. a a a MIL-P-24249A m 99999Ob lLb4bbb 7bL m MIL-P-24249A( SH) 3.43 Tensile
28、 strength. The tensile strength of the foamed block perpendicular to foam rise shall be a minimum of 80 Ib/in2 (see 4.6.5). 3.4.4 Shear strength. The shear strength of the foamed block (perpendicular to foam rise) shall be a minimum of 50 Ib/inz (see 4.6.6). 3.4.5 Unicellularity. The percent open ce
29、ll of the foam shall be a maximum of 15 percent (see 4.6.7). 3.4.6 Water absorption. The foam shall have a maximum water absorbance value of 0.10 pound per square foot of cut surface (see 4.6.8). 3.4.7 Oil resistance. The foam shall show no deterioration after being immersed in JP-5 fuel (see 4.6.9)
30、. 3.4.8 Humid aging. There shall be a maximum volume change of plus or minus 5 percent in the foam following humid aging (see 4.6.10). 3.4.9 Fire resistance. The foam shall have a maximum flame time of 15 seconds, a maximum extent of flame impingement of 8 inches, and a maximum drip flame time of 5
31、seconds (see 4.6.11). 3.4.10 Toxic products. The material shall have no adverse effect on the health of personnel when used for its intended purpose. Conformance shall be determined by a health hazard risk assessment (HHRA), to be conducted in accordance with 4.6.12. Products meeting this requiremen
32、t will be issued a letter of approval by the Naval Sea Systems Command. Letters of approval shall apply solely to those products specifically evaluated for toxicity. Formulation changes in the product shall require a reevaluation of the product for toxicity and a new letter of approval. Approval let
33、ters will be in effect for a maximum of three years after which reissue may be requested. Manufacturers shall provide a copy of the approval letter applicable to offered products to the contracting activity before the product wil be accepted (see 6.2(i). Questions pertaining to health hazards shall
34、be referred by the Contracting Activity to the Chief, Bureau of Medicine and Surgery, Department of the Navy, who will act as an advisor to the contracting Agency. 3.5 Precautions. 3.5.1 Ventilation. Since isocyanate fumes may be present during foam application, adequate ventilation as required by l
35、ocal industrial hygenist or as prescribed on MSDS is required to keep vapor concentrations below acceptable limits. If adequate ventilation cannot be provided, air masks shall be worn. 5 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-P-24249A( S
36、H) 3.5.2 Personal protective equipment. Anyone involved in foam application who may come in contact with isocyanates shall wear chemical safety glasses or face shields, rubber gloves, and coveralls to protect against splattering. 3.53 Fire safety. During the mixing and installation of the foam, mach
37、inery shall be calibrated frequently to ensure that system ingredients are being delivered according to the ratios and tolerances established by the contractor. Hot work, including welding, burning, and use of any open flames shall be completed before any foam installation commences. In addition, sm
38、oking, electric heaters, and so forth are prohibited from the site of installation and all surrounding areas. 3.5.4 Spills. In the event of a spill, pouring shall be immediately stopped and the ships safety office notified. The spill shall be cleaned up in accordance with manual procedure as instruc
39、ted on MSDS. This shall be done regardless of whether the spill is major or minor. 3.6 Workmanship. Workmanship shall be such as to assure a uniform product complying with this specification. 4. QUALITY ASSURANCE PROVISIONS 4.1 Responsibility for inspection. Unless otherwise specified in the contrac
40、t or purchase order, the contractor is responsible for the performance of all inspection requirements (examinations and tests) as specified herein. Except as otherwise specified in the contract or purchase order, the contractor may use his own or any other facilities suitable for the performance of
41、the inspection requirements specified herein, unless disapproved by the Government. The Government reserves the right to perform any of the inspections set forth in the specification where such inspections are deemed necessary to ensure supplies and services conform to prescribed requirements. 4.1.1
42、 Responsibility for compliance. All items shall meet all requirements of sections 3 and 5. The inspection set forth in this specification shall become a part of the contractors overall inspection system or quality program (see 6.3). The absence of any inspection requirements in the specification sha
43、ll not relieve the contractor of the responsibility of ensuring that all products or supplies submitted to the Government for acceptance comply with ali requirements of the contract. Sampling inspection, as part of the manufacturing operations, is an acceptable practice to ascertain conformance to r
44、equirements, however, this does not authorize submission of known defective material, either indicated or actual, nor does it commit the Government to accept defective material. 4.2 Classification of inspections. The inspection requirements specified herein are classified as follows: a. Qualificatio
45、n inspection (see 4.3) b. Quality conformance inspection (see 4.4). 6 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-P-24249A W 99999Ob LLb4bb 534 MIL-P-24249A( SH) 4.2.1 Inspection conditions. Unless otherwise specified, all inspections shall c
46、onform to the test conditions specified (see 4.6.1). 4.2.2 Inspection System. The contractor shall develop and maintain an inspection system in accordance with MIL-1-45208. 43 Qualification inspection. Qualification inspection shall be conducted at a laboratory satisfactory to the Naval Sea Systems
47、Command (NAVSEA). The inspection shall consist of the tests specified in 4.6 and shall be preceded by the following three steps: a. b. c. Verification of the plastic material physical property values (see 4.3.1) System description and quality assurance procedure (see 4.3.2) Qualifying mock-up pour (
48、see 4.3.3). 43.1 Initial qualification requirements. The contractor shall submit technical data to NAVSEA showing conformance to all physical property values in 3.4. Failure to meet the property values terminates the qualification process. 43.1.1 Sampling for qualification tests. Samples for testing
49、 shall be randomly selected from foam cast suing a 1-cubic foot (ft3), laboratory-prepared box pour. A repeat pour shall be made using the same lot of materials, equipment, pouring procedure, and ambient conditions and the results shall be reported. Tests on the repeat pour shall be limited to density and compressive strength (perpendicular to foam rise). Samples for density and compressive strength for both pours shall be randomly selected from a minimum of fiv
