ARMY A-A-50690-1990 TIRE FILL SOLID POLYURETHANE《轮胎填补固聚氨酯》.pdf

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1、COMMERCIAL ITEM DESCRIPTION TIRE FILL, SOLID POLYURETHANE t AMERICAN SOCIETY FOR TESTING MATERIALS (ASTM) STANDARDS I (Application for copies should be addressed to ASTM, 1916 Race Street, Philadelphia, PA 19103.) This commercial item description authorized by the Department of Defense Salient Chara

2、cteristics. t. 1. Co mponents. The filling compound shall consist of two separately packaged components (component “A” and W). One component shall be the prepolymer (isocyanate) portion of the compound, and the other compound shall be the catalyst (polyol). a. Compatibility: Components shall have a

3、batch to batch compatibility. b. Chemical specifications: The prepolymer (isocyanate) and the catalyst (polyol) components shall have the following chemical specifications. (1) Prepolvmer component. Prepolymer (isocyanate) component tested per ASTM Specifica- tion 1638. %NCO 3.50 Brooksfield viscosi

4、ty 23.0C, cps Specific gravity (minimum) 3.90 (maximum) 450 (minimum) 700 (maximum) 1 .O0 (minimum) 1 .O3 (maximum) Beneficial comments, recommendations, additions, deletions, clarifications, etc., and any other data which may improve this document should be sent by letter to: WR-ALC/MMDETB, Robins

5、AFB, GA 31 098 DISTRIBUTION STATEMENT A: Approved for public release; distribution is unlimited. O b FSC 2630 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-A-A-50690 O (2) Cata Ivst CO mponent. Catalyst (polyol) component tested per ASTM Specificat

6、ion D2849. Hydroxyl number 35 (minimum) 45 (maximum) Moisture, % 0.35 (minimum) 0.45 (maximum) Brooksfield viscosity 23.OoC, cps . Specific gravity 23.9”C 500 (minimum) 700 (maximum) 0.99 (minimum) 1 .O2 (maximum) 2. Cured product. a. Hardness. The hardness of the cured samples, after curing as desc

7、ribed in paragraph 4, shall be 28 plus or minus 3 Shore “A points when tested in accordance with ASTM D2240-81. b. Tensile strenath . The tensile strength shall be 200 psi minimum when tested in accordance with ASTM D412. c. Elonaation. Ultimate elongation shall be 300 percent minimum when tested in

8、 accordance with ASTM D412. d. Tear strenath. The tear strength shall be 50 Ibs per linear inch minimum when tested in accordance with ASTM 0624 Die “C” Method. e. Rebound. Rebound shall be minimum of 50 percent when tested in accordance with ASTM D2632. 3. Heat stab il ty . The heat aged product sh

9、all have good elastomeric properties and show no signs of degradation. The Shore “A hardness shall be no more than 45. 4. Cu rina time. When the two components are mixed and put in a tire at the required pressure, the resulting compound shall cure in a maximum of 24 hours at an ambient temperature o

10、f 70 degrees F. 5. Ope ratina temperature. The filling compound, after curing in a tire, shall operate without damage in ambient temperatures between 120F and minus 40F. 6. Shelf life. The two components shall be capable of being stored separately for one year minimum without loss of curing performa

11、nce when mixed. After one year, the addition of extra catalyst is allowed for successful curing. Certification. The contractor shall certify that the product offered meets the salient characteristics of this commercial item description, and that the product conforms to the producers own drawings, sp

12、ecifica- tions, standards and quality assurance practices and is the same product offered for sale in the commer- cial marketplace. Small businesses that cannot offer products with established commercial market ac- ceptability may compete by submission of bid samples. The government reserves the rig

13、ht to require proof of such conformance before first delivery and thereafter as may be otherwise provided for under the provisions of the contract. Packaaing. The items shall be packaged according to normal commercial practice and packed to assure acceptance by common carrier and provide product pro

14、tection against loss and damage during multiple shipment, handling and storage, The shipping container shall be in compliance with both national and uniform motor freight classifications. Shipping containers shall be marked as specified in the contract order. 0 20F3 Provided by IHSNot for ResaleNo r

15、eproduction or networking permitted without license from IHS-,-,- A-A-50670 26 = 979977L1 0057793 6 A-A-50690 Intended use . Polyurethane filled tires are intended for use on vehicles and trailers used on bomb ranges and those areas and job sites which have a significant history of tire failure and

16、replacement due to environmental foreign object damage. Polyurethane tire fill is also to be used for worn tire replacement on vehicles already procured with this system installed. I Military interests: Civil Agency Coordinating Activities: Preparing activity: GSA/FSS (F7XE) Air Force-84 ja i i i 1 (Project: 2630-FO29) 30F3 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-