ASTM B965-09(R2018) pdf free download

ASTM B965-09(R2018) pdf free download.Standard Specification for High Performance Tin-Coated Annealed Copper Wire Intended for Electrical and Electronic Application for Solderability
1. Scope
1.1 This specification covers tin-coated annealed copper wire intended for electrical and electronic applications where solderability is a requirement. 1.2 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. 1.2.1 Exceptions—The SI values for density, resistivity, and volume are to be regarded as standard. 1.3 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 of regulatory limitations prior to use. 1.4 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.
4. Material
4.1 Tin for Coating—The tin shall be electroplated for the coating and shall be commercially pure (Explanatory Note 1). For purposes of this specification, the tin shall be considered commercially pure if the total of other elements, exclusive of copper, does not exceed 1 %. Not withstanding the previous sentence, chemical analysis of the tin coating or of the tin used for coating shall not be required under this specification. 4.2 Copper-Base Metal—The base metal shall be copper of such quality and purity that the finished product shall have properties and characteristics prescribed in this specification. N OTE 1—Specification B49 defines copper suitable for use.
5. General Requirements (See Section 8)
5.1 Tensile Strength and Elongation (Explanatory Note 4)—The tinned wire shall conform to the requirements for elongation prescribed in Table 1. No requirements for tensile strength are specified. For wire whose nominal diameter is more than 0.001 in. (0.025 mm) greater than a size listed in but less than that of the next larger size, the requirements of the next larger size shall apply. 5.2 Resistivity (Explanatory Note 1 and Note 3)—The elec- trical resistivity of tinned wire at a temperature of 20°C shall not exceed the values prescribed in Table 2. 5.3 Dimensions and Permissible Variations (Explanatory Note 2)—The wire sizes shall be expressed as the diameter of the wire in decimal fractions of an inch to the nearest 0.0001 in. (0.0025 mm). The tin-coated wire shall not vary from the specified diameter by more than the amounts prescribed in Table 3.5.4 Continuity of Coating- -The tin coating shall be continu- ous. The continuity of coating on the wire shall be determined on representative samples taken before stranding or insulating. The continuity of tinning shall be determined by the hydro- chloric acid-sodium polysulfide test in accordance with 6.4. 5.5 Thickness of Coating- -The wire shall have adequate free tin (Explanatory Note 1) to insure meeting solderability requirements as prescribed in 5.8. The thickness of coating shall be at the manufacturer’s discretion or as agreed upon between the manufacturer and purchaser to insure compliance to 5.8 and further processing for solderability performance after insulation. 5.6 Adherence of Coating- -The tin coating shall be firmly adherent to the surface of the copper. The adherence of coating on the wire shall be determined on representative samples taken after electroplating and prior to final drawing. The adherence of coating shall be determined by the wrapping test in accordance with 6.6. 5.7 Joints- -Necessary joints in the completed wire and in the wire and rods prior to final drawing shall be made in accordance with the best commercial practice. 5.8 Solderability- -The solder must cover greater than 95 % of the surface of the specimen and show evidence of good wetting and of bonding. The solderability shall be tested in accordance with 6.7. 5.9 Finish- -The coating shall consist of a smooth continu- ous layer, firmly adherent to the surface of the copper. The wire shall be free of all imperfections not consistent with the best commercial practice.