1、Designation: D3772 01 (Reapproved 2010)Standard Specification forNatural Rubber Finger Cots1This standard is issued under the fixed designation D3772; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last revision. A num
2、ber in parentheses indicates the year of last reapproval. Asuperscript epsilon () 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 the requirements for fingercots
3、 made from natural rubber latex. The purpose of thisspecification is to obtain consistent performance among prod-ucts produced in various locations or at various times in thesame location.1.2 This specification does not cover the safe and proper useof finger cots or products of special construction
4、for specialuse.1.3 The values stated in SI units are to be regarded as thestandard.1.4 This standard does not purport to address all of thesafety concerns, if any, associated with its use. It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and
5、determine the applica-bility of regulatory limitations prior to use.2. Referenced Documents2.1 ASTM Standards:2D412 Test Methods for Vulcanized Rubber and Thermo-plastic ElastomersTensionD573 Test Method for RubberDeterioration in an AirOvenD865 Test Method for RubberDeterioration by Heating inAir (
6、Test Tube Enclosure)D1076 Specification for RubberConcentrated, AmmoniaPreserved, Creamed, and Centrifuged Natural LatexD3767 Practice for RubberMeasurement of Dimensions2.2 Other Documents:ISO 2859 Sampling Procedures and Tables for Inspectionby Attributes3Code of Federal Regulations, Title 21Food
7、and DrugAdministration, Part 17743. Classification3.1 Types:3.1.1 Type 1Rolled.3.1.2 Type 2Flat.3.2 SizesThe sizes covered are small, medium, large, andextra large.4. Ordering Information4.1 Orders for material under this specification shall includethe following information:4.1.1 Reference to thisAS
8、TM designation (D3772) and yearof issue,4.1.2 Type,4.1.3 Thickness (if different than that specified), and4.1.4 Size.5. Materials and Manufacture5.1 Finger cots shall be manufactured from latex conform-ing to Specification D1076.5.2 Finger cots shall be free of embedded grit or discolora-tion, but m
9、ay be transparent, opaque, or colored.5.3 Finger cots and any dressing materials applied to themshall not liberate substances known to be toxic or otherwiseharmful under normal conditions of use. Any dressing orcompounding materials shall not have a deleterious effect onthe rubber and shall be permi
10、tted by the Code of FederalRegulations, Title 21, Food and Drug Administration, Section177.2600 on Rubber Articles Intended for Repeated Use, thatlists materials safe for use as indirect food additives. Othermaterials may be used if their safety and efficacy have beenestablished previously.6. Perfor
11、mance6.1 Finger cots sampled in accordance with Section 7, shallmeet the following performance requirements:1This specification is under the jurisdiction ofASTM Committee D11 on Rubberand is the direct responsibility of Subcommittee D11.40 on Consumer RubberProducts.Current edition approved May 1, 2
12、010. Published September 2010. Originallyapproved in 1979. Last previous edition approved in 2005 as D3772 01 (2005).DOI: 10.1520/D3772-01R10.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards vol
13、ume information, refer to the standards Document Summary page onthe ASTM website.3Available from American National Standards Institute (ANSI), 25 W. 43rd St.,4th Floor, New York, NY 10036.4Available from the Superintendent of Documents, U. S. Government PrintingOffice, Washington, DC 20402.1Copyrigh
14、t ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.6.1.1 Have consistent physical dimensions in accordancewith 8.2.2.6.1.2 Have acceptable physical property characteristics inaccordance with 8.3.6.1.3 Meet the inspection criteria as specified in
15、 8.4.7. Sampling7.1 Finger cots shall be sampled and inspected in accor-dance with ISO 2859. The inspection levels and acceptablequality levels (AQL) shall conform to those specified in Table1, or as agreed between the purchaser and seller.8. Test Methods8.1 The following tests shall be conducted to
16、 ensure therequirements of Section 9 are met as prescribed in Table 1.8.2 Design:8.2.1 RimThe open end of the finger cot shall terminate inan integral rim.8.2.2 Physical DimensionsThe length shall be 70 6 5mm. The thickness shall be 0.09 6 0.03 mm or as agreed uponby the manufacturer and end user. T
17、he width of the varioussizes shall be as follows: small, 24 6 2 mm; medium, 28 6 2mm; large, 30 6 2 mm; extra large, 34.5 6 2.5 mm.8.2.3 SamplingSampling shall be conducted according tothe inspection level and AQL specified in Table 1.8.2.4 TestingMeasure the length of the finger cot to thenearest 1
18、 mm. Measure the width to the nearest 0.5 mm at adistance at least 5 mm from the ends. Measure the thickness tothe nearest 0.002 mm at a distance about 5 mm from the openend, on specimens from which any lubricant has been removedwith water or isopropanol. The thickness micrometer shallconform to Tes
19、t Methods D412, except for the smaller-scalegraduations.8.2.5 The precision and bias for measuring dimensions areas specified in Practice D3767.8.3 Physical Properties:8.3.1 Finger cots shall meet the minimum requirementsspecified in Table 2.8.3.2 SamplingSampling shall be conducted according tothe
20、inspection level and AQL specified in Table 1.8.3.3 Testing:8.3.3.1 Condition finger cots to be subjected to acceleratedaging for 166 6 2hat706 2C, or for 22 6 0.3 h at 100 62C in accordance with Test Methods D573 or D865. Forreferee tests, condition for 166 6 2hat706 1C, inaccordance with Test Meth
21、od D573.8.3.3.2 If Test Method D573 is used, do not age finger cotsof different composition at the same time in the same oven.Age finger cots in original packages. Condition both aged andunaged finger cots at 23 6 2C for not less than 16 h beforetesting.8.3.3.3 Determine the ultimate elongation in a
22、ccordancewith Test Methods D412. Use ring specimens cut perpendicularto the length direction of the finger cots with a die havingcutting edges spaced 20.0 6 0.1 mm apart and longer than thewidth of the cot. Cut the specimen near the center of the length,rejecting any specimen not cut with a single i
23、mpact of the die.Measure the specimen width of the flattened ring to the nearest0.5 mm and multiply by two to obtain the circumference of thering. Use a tester having a grip separation speed of 8.5 6 0.8mm/s, and roller grips at least 20 mm in width, about 5 mm indiameter, lubricated on the surface
24、with castor oil or othereffective rubber lubricant.8.3.3.4 Calculate the ultimate elongation, E, in percent asfollows:E 5 100 2D 1 G 2 C!/C (1)where:C = circumference of specimen,D = distance between centers of roller grips at break, andG = circumference of one roller grip.8.3.4 The precision and bi
25、as of determining tensile strengthand ultimate elongation are as specified in Test Methods D412.8.4 Inspection:8.4.1 Finger cots shall be inspected for tears, holes, embed-ded particles, foreign material, and adhering surfaces mani-fested by Type 1 cots failing to unroll easily and Type 2 cotsadheri
26、ng to each other or restricting admission of the finger. Ifthe order specifies type of lubricant, inspect finger cots for thespecified type.8.4.2 Finger cots shall be sampled for inspection accordingto the inspection level and AQL specified in Table 2.9. Acceptance9.1 Finger cots will be considered
27、to meet the performancerequirements when test results do not exceed the AQL pre-scribed in Table 2.9.2 Reinspection is permissible under the provisions ofISO 2859.10. Packaging and Package Marking10.1 Unless otherwise specified, packaging shall be inaccordance with the manufacturers commercial pract
28、ice toprotect finger cots during transportation and storage.10.2 Instructions shall be included on proper storage toassure long life, emphasizing the need for storage in a coolplace where mechanical damage is not likely and there is nocontact with oil-based antiseptics, phenols and their deriva-tive
29、s, petroleum-based products, or other material harmful torubber.11. Keywords11.1 finger cots; natural rubber finger cotsTABLE 1 Performance RequirementsCharacteristic Related Defects Inspection Level AQLDimensions length, thickness, width S-2 4.0Physical Properties before aging, after acceleratedagi
30、ng S-2 4.0Inspection tears, holes, embedded particles,foreign matter, adhering surfacesS-2 4.0TABLE 2 Physical PropertiesTensile Strength (MPa)Mean (Average) SpecimenOriginal 24 18Aged 20 18D3772 01 (2010)2ASTM International takes no position respecting the validity of any patent rights asserted in
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