1、L-P-386C August 26, 1977 SUPERSEDING Fed. Spec. L-P-386B May 25, 1973 FEDERAL SPECIFICATION PLASTIC MATERIAL, CELLULAR, URETHAN (FLEXIBLE) This specification was approved by the Commissioner, Federal Supply Service, General Services Administration, for the use of all Federal agencies. 1. SCOPE FND C
2、LASSIFICATION 1.1 Scope. This specification covers cellular urethane plastic material designed for such applications as upholstery, general seatinu, mattresses, and other uses. NOTE: The material will be designated as urethane foam in this specification. 1.2 Classification. 1.2.1 Tm. The urethane fo
3、am shall be furnished in the following types as speci- _ fied (see 6.2): Type I - Conventional Type II - Conventional, combustion-modified* Type III - Filled Type IV - Filled, cornbustion-modified* Type V - High resilience, unfilled Type VI - High resilience, combustion-modified* *Additives are desi
4、gned to lessen combustibility of foams; they do not prevent foams from burning. 1.2.2 Class. Urethane foams , Types I through IV, shall be furnished in the following classes, as specified (see 3.3, 3.5.1, and 6.2): Class 1 - Super soft. Class 2 - Soft. Class 3 - Medium. Class 4 - Firm. Class 5 - Ext
5、ra firm. Class 6 - Super firm. Urethane foams, Types V and VI, shall be furnished in the following grades : Grade IR-I (IFD at 25 percent deflection c 67 Newtons/323 sq cm). Grade HR-II (IFD at 25 percent deflection) 67 Newtons/323 sq cm). 1.2.3 Dimensions and thickness. Dimensions and thickness sha
6、ll be as specified in the contract .or order (see 3.2 , table I , and 6.2) . 2. APPLICABLE DOCUMENTS 2.1 The following documents , of the issues in effect on date of invitation for bids or request for proposal, form a part of this specification to the extent specified herein. FSC 9330 Provided by IH
7、SNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-L-P-38bC 73 W 7777774 0007074 7 m “ L-P-386C (Activities outside the Federal Government may obtain copies of Federal Specifica- tions, Standards, and Handbooks as outlined under General Information in the Index of Fe
8、deral Specifications and Standards and at the prices indicated in the Index. The Index, which includes cumulative monthly supplements as issued, is for sale on a sub- scription basis by the Superintendent of Documents, U.S. Government Printing Office, Washington DC 20402. (Single copies of this spec
9、ification and other Federal Specifications required by activities outside the Federal Government for bidding purposes are available without charge from Business Service Centers at the General Services Administration Regional Offices in Boston, New York, Philadelphia, Washinqton , DC, Atlanta, Chicag
10、o, Kansas City, Mo, Fort Worth, -Houston, Denver, San Francisco, Los Enueles, and Seattle. WA. (Federal Government activities may obtain copies of Federal Specifications, Stand- ards, and Handbooks and the Index of Federal Specifications and Standards from established distribution points in their ag
11、encies.) Military Standard: MIL-Sm-105 - Sampling Procedures and Tables for Inspection by Attributes. (Copies of Military Specifications and Standards required by contractors in connec- tion with specific procurement functions should be obtained from the procuring activity or as directed by the cont
12、racting officer. ) 2.2 Other publications. The following documents form a part of this specification to the extent specified herein. Unless a specific issue is identified, the issue in effect on date of invitation for bids or request for proposal shall apply. Amrican Society for Testing and-Material
13、s =TM) Stand incorrect: il1egible;improper size, location, seqaence, or method of applica- tion. as: incomplete closure of containers, containers distorted or dirty. Workmanship Inadequate application of components such 4.3.2.4 Testing of the end item. The end item shall be tested for the applicable
14、 characteristizlisted in 4.3.3. The lot size shall be expresse3 in units of singze packages of completed manufactured product or single slabs. The sample unit quantity or a completed manufactured product shall be one such completed product; for slab stock, the sample shall be 3600 sq cm (4 sq ft) of
15、 the material with a thickness of 102 mm (4 in) and shall be cut from the near-vertical mid-point of the bun and at least 30 meters (100 feet) from the start of the run. NO more than one sample unit shall be taken from any slab. The inspection level for determining the sample size for tests shall be
16、 S-1 except that no less than three sample units shall be randomly selected throuahout the lot. The lot shall be unacceptable if one or more units fail to meet any requirements specified. 4.3.3 Testing of end item. 4.3.3.1 Density. Apparent density shall he measured accordinq to ASTM D 3574. The ure
17、thane polymer density of a foam is taken to be 100 percent minus percent of the filler times apparent density. Filler is taken as ash content measured as follows: Weigh to the nearest milligram a 1-gram sample of the foam into a porcelain or silica crucible, approximately 55-cc capacity, which has b
18、een ignited and weighed. Place the crucible in an electric muffle furnace with controls necessary to hold the temperature at 550 + 25 C. Determine the temperature with a calibrated thermocouple-sensing eleiiient placed at approximately the geometric center of the furnace cavity and connected to an e
19、xterior temperature readout device. Place no more than two crucibles in the furnace atone time and position them directly below the thermocouple. Immediately close the door completely and do not open it for one hour. After one hour, open the furnace door 3 to 5 cm and continue heating for 30 minutes
20、 or until.al1 carbonaceous material is burneg off. Remove the crucible from the furnace, cool in a desiccator, and weigh. Calculate the percent of ash as follows: where A = grams of ash plus crucible, B = grams of crucible, C = grams of foam sample. 6 Provided by IHSNot for ResaleNo reproduction or
21、networking permitted without license from IHS-,-,-L-P-38bC 93 m 979797q O007099 8 L-P-386C 4.3.3.2 Tensile stren th and elonqation. Tensile strength and elongation shall be tested according to AS also dimensions and thickness (see (c) IFD values required for classes 1 or 6 , if applicable (see 3.5.1
22、). (d) Any applicable federal, state, or local combustibility regulations (e) Packing required (see 5 .l) . 1.2.1, 1.2.2, and 1.2.3). (see 6.3). 7 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
