1、Designation: D 3738 84 (Reapproved 2004)Standard Specification forRubber-Coated Cloth Hospital Sheeting1This standard is issued under the fixed designation D 3738; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last re
2、vision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon (e) indicates an editorial change since the last revision or reapproval.This standard has been approved for use by agencies of the Department of Defense.1. Scope1.1 This specification covers rubber-coated clo
3、th sheetingintended for use in the protection of mattresses on hospitalbeds.1.2 The values stated in SI units are to be regarded as thestandard.1.3 The following safety hazards caveat pertains only to thetest methods portion, Section 9, of this specification. Thisstandard does not purport to address
4、 all of the safety concerns,if any, associated with its use. It is the responsibility of the userof this standard to establish appropriate safety and healthpractices and determine the applicability of regulatory limita-tions prior to use.2. Referenced Documents2.1 ASTM Standards:2D 573 Test Method f
5、or RubberDeterioration in an AirOvenD 751 Test Methods for Coated FabricsD 3393 Specification for Coated FabricsWaterproofness2.2 U.S. Government Document:3Food and Drug Administration, Code of Federal Regula-tions, Title 21, Part 177 or Part 1823. Ordering Information3.1 Orders for rubber-coated cl
6、oth sheeting should specifyin the contract or purchase order the following information:3.1.1 Quantity of cloth per finished roll (6.1),3.1.2 Sample size and frequency for testing (7.1),3.1.3 Certification (11.1),3.1.4 Marking necessity (12.1), and3.1.5 Special packaging (13.1).4. Materials and Manuf
7、acture4.1 Materials:4.1.1 The base cloth shall be hospital sheeting woven fromcotton yarn, synthetic yarn, or a blend of cotton and syntheticyarn.4.1.2 The coating compound shall be natural rubber, syn-thetic rubber, or a mixture of natural and synthetic rubberssuitably formulated and colored with a
8、 white pigment to meetthe requirements of this specification.4.2 ManufactureThe base cloth (4.1.1) shall be coateduniformly on both sides with equal amounts of the coatingcompound (4.1.2). The coated fabric may be dusted with a talcthat does not support mildew growth. The coated cloth shall bevulcan
9、ized to meet the physical requirements of Table 1 andthe chemical requirements specified in this specification.5. Chemical Requirements5.1 Resistance to Phenol and Isopropyl AlcoholCoatedcloth shall show no evidence of softening, tackiness, harden-ing, peeling, or blistering when subjected to a 5 %
10、phenol-water solution and a 70 % isopropyl alcohol-water solution inaccordance with 9.7 and 9.8.5.2 Steam SterilizationCoated cloth shall show no evi-dence of softening, tackiness, hardening, peeling, or blisteringwhen subjected to steam sterilization in accordance with 9.10.6. Length of Roll6.1 Unl
11、ess otherwise specified in the contract or purchaseorder, cloth shall be furnished in rolls, 55 m (60 yd) of cloth perroll. The roll shall contain no more than three pieces and nopiece shall be less than 5.5 m (6 yd) in length.7. Workmanship, Finish, and Appearance7.1 Coated cloth shall not have any
12、 of the following defects:7.1.1 Cuts, tears, or holes (including pinholes).7.1.1.1 Pinholes shall be detected by holding the 3-m (3-yd)samples (8.1) in front of an illuminated bulb (60 W minimum)while examining the entire area for the defects described in 7.1.7.1.2 Uncoated areas.7.1.3 Thinly coated
13、 areas.7.1.4 Separation of cloth from coating.7.1.5 Cracked coating.1This specification is under the jurisdiction ofASTM Committee D11 on Rubberand is the direct responsibility of Subcommittee D11.37 on Coated Fabrics andRubber Thread.Current edition approved Dec. 1, 2004. Published December 2004. O
14、riginallyapproved in 1978. Last previous edition approved in 2000 as D 3738 84 (2000).2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary
15、 page onthe ASTM website.3Available from U.S. Government Printing Office Superintendent of Documents,732 N. Capitol St., NW, Mail Stop: SDE, Washington, DC 20401.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.7.1.6 Lumps or blisters
16、.7.1.7 Color, not white and uniform.7.1.8 Curled or rolled edges.7.1.9 Dirt, spots, or stains.7.1.10 Offensive odor.7.1.10.1 Normal aromatic odors usually associated withcured-rubber coatings shall not be classified as offensive.Compounding materials shall be permitted in accordance withCode of Fede
17、ral Regulations, Title 21, Food and Drug Admin-istration Part 177, indirect food additions, polymers or Part182Substances Generally Recognized as Safe (GRAS) andthat meet the extraction requirements of Section 77.2600Rubber Articles Intended for Repeated Use.8. Sampling8.1 Unless otherwise specified
18、 in the contract or purchaseorder, the number of rolls from which a 3-m (3-yd) full-widthsample is to be selected should be in accordance with Table 2.Test specimens shall be prepared for the various tests from allsamples.9. Test Methods9.1 GeneralTests for coated-cloth bedding shall conformto Test
19、Method D 751 whenever applicable.9.2 SignificanceThe phenol, alcohol, and steam-sterilization tests determine how well-coated rubber clothresists chemical deterioration and are useful in predicting howthe coated cloth will perform in actual service.9.3 Coating ThicknessDetermine the coating thicknes
20、s onthe cloth by measuring the thickness of the uncoated base clothand then the thickness of the coated cloth. The micrometer usedto measure the thickness shall have graduations not exceeding0.02 mm (0.001 in.), and the pressure exerted by the foot on thespecimen shall be 22 6 5 kPa (3.2 6 0.7 psi).
21、 The thickness ofthe coating shall conform to Table 1.9.4 Breaking ForceDetermine the breaking force in ac-cordance with Procedure A of Test Method D 751.9.5 Adhesion TestDetermine the coating adhesionstrength in accordance with Test Method D 751.9.6 Waterproofness TestTest as in Specification D 339
22、3.Flex each specimen five times within 1 min by applying andreleasing a pressure of 175 6 15.0 kPa (25 6 2 psi). After thefifth flex maintain the pressure at 175 6 15.0 kPa for 5 min. Noleakage shall occur. Leakage shall be defined as the appearanceof water at one or more spots in the test area.9.7
23、Phenol Resistance Test:9.7.1 Cut a specimen 150 mm (6 in.) square from the testsample (7.1), immerse in a 5 % phenol-water solution, and holdfor 166 6 1hat236 2C (73.4 6 3.6F). Wash the specimenwith soap and water and rinse with water. Blot the washedspecimen dry with filter paper or other absorbent
24、 material priorto the 5 % phenol-solution immersion. The container shall belarge enough to allow the liquid to circulate freely. Cover thecontainer tightly to prevent excessive evaporation of the liquid.9.7.2 At the end of immersion period, remove the specimenfrom the solution, rinse with water, and
25、 dry with a suitableabsorbent material. Prior to examining the specimen forevidence of softening, tackiness, hardening, peeling, or blister-ing, allow the sample to rest for 2 h.9.8 Alcohol Resistance Test:9.8.1 Cut a specimen 150 mm (6 in.) square from the testsample (7.1), wash with soap and water
26、, rinse, and dry with asuitable absorbent material, such as filter paper. Place thespecimen in a glass container and cover with a 70/30 %isopropyl alcohol-water-solution at 23 6 2C (73.4 6 3.6F)for 22 614 h. Cover the container tightly to prevent evapora-tion.9.8.2 At the end of the immersion period
27、, remove thespecimen from solution, rinse with water, and dry with asuitable absorbent material. Examine the specimen for anyevidence of softening, tackiness, hardening, peeling, or blister-ing.9.9 Accelerated Aging TestCut a specimen 200 by 100mm (8 by 4 in.) from the test sample (7.1) and place in
28、 an aircirculating oven that conforms to Test Method D 573 main-tained at 70 6 1C (158 6 2F) for seven days. Aftercompletion of the aging, the specimen shall not have becomestiff, brittle, tacky, or discolored.9.10 Steam Sterilization Test:9.10.1 Cut a specimen 300 mm (12 in.) square from the testsa
29、mple (7.1). Fold the specimen once to give a rectangle 300by 150 mm (12 by 6 in.) and fold again to give a square 150mm (6 in.).9.10.2 Wrap the specimen in four or five layers of cottongauze or cheesecloth and suspend or place the sample on aperforated shelf in the steam chamber. Admit the steam to
30、thechamber at a rate that will raise the temperature within 5 minto 125 6 2C (257.8 6 3.6F). At this temperature the steamin the chamber shall not contain more than 1 volume of air per1000 volumes of steam. Start the sterilization period at the timethe chamber reaches the required temperature. The s
31、pecimenshall remain at the required temperature for 20 612 min.At theend of the sterilization period, remove the specimen fromchamber and allow to cool for 20 min at room temperature.Repeat the steaming and cooling cycling a total of five times.At the end of the fifth cycle, cool the specimen to roo
32、mtemperature and condition it for not less than 16 h nor morethan 96 h. Visually examine the specimen for signs of stiffness,brittleness, tackiness, cracking, or discoloration.TABLE 1 Physical PropertiesCharacteristicCoating thickness:min, mm (in.) 0.33 (0.013)max, mm (in.) 0.46 (0.018)Breaking stre
33、ngth:Warp, N (lbf) 222 (50)Fill, N (lbf) 222 (50)Adhesion rubber to cloth, N/m (lbf/in.) 613 (3.5)Waterproofness test no leakageTABLE 2 Samples RequiredLot Size, Rolls Samples Required10 or less 211 to 350 3351 and over 5D 3738 84 (2004)210. Rejection and Rehearing10.1 Material that fails to conform
34、 to the requirements ofthis specification may be rejected. Rejection should be reportedto the producer or supplier promptly and in writing. In case ofdissatisfaction with the results of the test, the producer orsupplier may make claim for a rehearing.11. Certification11.1 When specified in the purch
35、ase order or contract, aproducers or suppliers certification shall be furnished to thepurchaser that the material was manufactured, sampled, tested,and inspected in accordance with this specification and hasbeen found to meet the requirements. When specified in thepurchase order or contract, a repor
36、t of the test results shall befurnished.12. Product Marking12.1 Unless otherwise specified in the contract or purchaseorder, cloth shall be marked on a label or tag with themanufacturers name or trademark and the dimensions.13. Packaging13.1 Unless otherwise specified in the contract or purchaseorde
37、r, the coated cloth shall be protected for shipment andstorage in accordance with the manufacturers standard prac-tice.14. Keywords14.1 hospital sheeting; rubber-coated clothASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mention
38、edin this standard. Users of this standard are expressly advised that determination of the validity of any such patent rights, and the riskof infringement of such rights, are entirely their own responsibility.This standard is subject to revision at any time by the responsible technical committee and
39、 must be reviewed every five years andif not revised, either reapproved or withdrawn. Your comments are invited either for revision of this standard or for additional standardsand should be addressed to ASTM International Headquarters. Your comments will receive careful consideration at a meeting of
40、 theresponsible technical committee, which you may attend. If you feel that your comments have not received a fair hearing you shouldmake your views known to the ASTM Committee on Standards, at the address shown below.This standard is copyrighted by ASTM International, 100 Barr Harbor Drive, PO Box
41、C700, West Conshohocken, PA 19428-2959,United States. Individual reprints (single or multiple copies) of this standard may be obtained by contacting ASTM at the aboveaddress or at 610-832-9585 (phone), 610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website(www.astm.org).D 3738 84 (2004)3
