ASTM D3772-15(R2021) pdf free download

ASTM D3772-15(R2021) pdf free download.Standard Specification for Industrial Rubber Finger Cots
1. Scope
1.1 This specification covers the requirements for finger cots used in industrial applications which are made from natural rubber latex or a synthetic nitrile polymer. The purpose of this specification is to obtain consistent performance among products produced in various locations or at various times in the same location. 1.2 This specification does not cover the safe and proper use of finger cots or products of special construction for special use. 1.3 The values stated in SI units are to be regarded as the standard. 1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appro- priate safety, health, and environmental practices and deter- mine the applicability ofregulatory limitations prior to use. 1.5 This international standard was developed in accor- dance with internationally recognized principles on standard- ization established in the Decision on Principles for the Development of International Standards, Guides and Recom- mendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
5. Materials and Manufacture
5.1 Finger cots shall be manufactured from latex conform- ing to Specification D1076 or a synthetic nitrile polymer compound that meets the requirements in this specification. 5.2 Finger cots shall be free of embedded grit or discoloration, but may be transparent, opaque, or colored. 5.3 Finger cots and any dressing materials applied to them shall not liberate substances known to be toxic or otherwise harmful under normal conditions of use. Any dressing or compounding materials shall not have a deleterious effect on the rubber and shall be permitted by the Code of Federal Regulations, Title 21, Food and Drug Administration, Section 177.2600 on Rubber Articles Intended for Repeated Use, that lists materials safe for use as indirect food additives. Other materials may be used if their safety and efficacy have been established previously.
8. Test Methods
8.1 The following tests shall be conducted to ensure the requirements of Section 9 are met as prescribed in Table 1. 8.2 Design: 8.2.1 Rim—The open end of the finger cot shall terminate in an integral rim. 8.2.2 Physical Dimensions—The length shall be 70 6 5 mm. The single wall thickness shall be 0.09 6 0.03 mm or as agreed upon by the manufacturer and end user. The width when laid flat of the various sizes shall be as follows: small, 24 6 2 mm; medium, 28 6 2 mm; large, 30 6 2 mm; extra large, 34.5 6 2.5 mm; XXL, 36.5 6 2.5 mm. 8.2.3 Sampling—Sampling shall be conducted according to the inspection level and AQL specified in Table 1. 8.2.4 Testing—Measure the length of the finger cot to the nearest 1 mm. Measure the width to the nearest 0.5 mm at a distance at least 5 mm from the ends. Measure the thickness to the nearest 0.01 mm at a distance about 5 mm from the open end, on specimens from which any lubricant has been removed with water or isopropanol. The thickness micrometer shall conform to Test Methods D412, except for the smaller-scale graduations. 8.2.5 The precision and bias for measuring dimensions are as specified in Practice D3767. 8.3 Physical Properties: 8.3.1 Finger cots shall meet the minimum requirements specified in Table 2. 8.3.2 Sampling—Sampling shall be conducted according to the inspection level and AQL specified in Table 1. 8.3.3 Testing:8.3.3.1 Condition finger cots to be subjected to accelerated aging for 166 6 2 h at 70 6 2°C, or for 22 6 0.3 h at 100 6 2°C in accordance with Test Methods D573 or D865. For referee tests, condition for 166 6 2 h at 70 6 1°C, in accordance with Test Method D573. 8.3.3.2 If Test Method D573 is used, do not age finger cots of different composition at the same time in the same oven. Age finger cots in original packages. Condition both aged and unaged finger cots at 23 6 2°C for not less than 16 h before testing. 8.3.3.3 Determine the ultimate elongation in accordance with Test Methods D412. Use ring specimens cut perpendicular to the length direction of the finger cots with a die having cutting edges spaced 20.0 6 0.1 mm apart and longer than the width ofthe cot. Cut the specimen near the center ofthe length, rejecting any specimen not cut with a single impact of the die. Measure the specimen width of the flattened ring to the nearest 0.5 mm and multiply by two to obtain the circumference of the ring. Use a tester having a grip separation speed of 8.5 6 0.8 mm/s, and roller grips at least 20 mm in width, about 5 mm in diameter, lubricated on the surface with castor oil or other effective rubber lubricant.