ASTM B298-2017 pdf free download

ASTM B298-2017 pdf free download.Standard Specification for Silver-Coated Soft or Annealed Copper Wire
1. Scope
1.1 This specification covers silver-coated, soft or annealed, round copper wire, intended for use in electrical equipment, as follows: 1.1.1 Class A—Wire whose silver coating is at least 1.25 % of the total weight of the coated wire. 1.1.2 Class B—Wire whose silver coating is at least 2.50 % of the total weight of the coated wire. 1.1.3 Class C—Wire whose silver coating is at least 4.00 % of the total weight of the coated wire. 1.1.4 Class D—Wire whose silver coating is at least 6.10 % of the total weight of the coated wire. 1.1.5 Class E—Wire whose silver coating is at least 10.00 % of the total weight of the coated wire. 1.2 Silver-coated wire having different minimum percent- ages of silver by weight may be obtained by mutual agreement between the manufacturer and the purchaser. For information purposes the thickness of coating in microinches provided by the percentages listed above is shown in Table 1 (Explanatory Note 1). 1.3 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard. 1.3.1 Exceptions—The SI values for density, resistivity, and volume are to be regarded as standard. 1.4 The following precautionary caveat pertains only to the test method section ofthis specification: This standarddoes not purport to address all ofthe safety concerns, ifany, associated with its use. It is the responsibility ofthe user ofthis standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. For specific precautionary statements see 8.4.1.2 and Explanatory Note 2. 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.
6. Conformance Criteria (Explanatory Note 5)
6.1 Any lot of wire, the samples of which comply with the conformance criteria of this section, shall be considered as complying with the requirements of Section 5. Individual production units that fail to meet one or more of the require- ments shall be rejected. Failure of a sample group from a lot to meet one or more of the following criteria shall constitute cause for rejection ofthe lot. The conformance criteria for each of the prescribed properties given in Section 5 are as follows: 6.1.1 Elongation—The lot shall be considered conforming if the elongation ofeach ofthe selected specimens is not less than the elongation value in Table 1. 6.2 Resistivity—The electrical resistivity of each of the four specimens shall conform to the requirements of 5.2. Failure to meet these requirements shall constitute failure to meet the resistivity conformance criterion. 6.3 Dimensions—The dimensions of the first sample (Table 2) shall conform to the requirements of 5.3. If there are no failures, the lot conforms to this requirement. If there are failures, but the number of these do not exceed the allowable defect number, c 2 (Table 2), for the respective number of units in the sample, a second sample equal to n 2 shall be taken and the total defects of the n plus n 2 units shall not exceed the allowable defect number, c 2 . Failure to meet this requirement shall constitute failure to meet the dimensional conformance criterion. 6.4 Continuity ofCoating—The continuity of the coating of each of the eight specimens shall conform to the requirements of 5.4. Failure of more than two specimens shall constitute failure to meet the continuity criterion. If not more than two specimens fail to meet the continuity criteria, eight additional specimens from the lot shall be tested, all of which shall conform to the continuity criteria. However, any individual production unit, the specimen from which failed to meet the continuity criteria, shall be rejected.