Find the most up-to-date version of ASTM B at Engineering ASTM B_能源/化工_工程科技_专业资料。Designation: B – 07 Standard Speci?cation for Silver-Coated Soft or Annealed Copper. Buy ASTM B SPECIFICATION FOR SILVER-COATED SOFT OR ANNEALED COPPER WIRE from SAI Global.
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B — 07 Standard Speci?
ASTM B – 12() Standard Specification for Silver-Coated Soft or Annealed Copper Wire
A number in parentheses indicates the year of last reapproval. A superscript epsilon e indicates an editorial change since the last revision or reapproval. For information purposes the thickness of coating in microinches provided by the percentages listed above is shown in Table 1 Explanatory Note 1. For all other properties values stated in inch-pound units are to be regarded as the standard.
The values given in parentheses are provided for information purposes only. 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 appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
Current edition approved May 15, Originally approved in Last previous edition approved in as B — 99e1. For Information Only Class A, 1. This value was corrected editorially to conform with Table X1.
Government see S1, S2, and S3. Materials and Manufacture 4. NOTE 1—The following speci? The coated wire shall not vary from the speci? General Requirements General Requirements 5. No requirements for tensile strength are speci? For wire whose nominal diameter is more than 0. The continuity of the coating shall be determined on representative samples taken before stranding or insulating and shall be determined by the sodium polysul?
Wire whose coating weight corresponds to a thickness less than 40? When coatings other than these classes are required, the weight of the coating shall be not less than that speci?
For ease of comparison, the thickness of coating for these classes has been included in Table 1 Explanatory Note 4. Joints made after plating shall not be allowed to remain in the? The wire shall be bright and free from all imperfections not consistent with the best commercial practice. Conformance Criteria Explanatory Note 5 6.
ASTM B – Standard Specification for Silver-Coated Soft or Annealed Copper Wire
Individual production units that fail to meet one or more of the requirements 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 of the lot. The conformance criteria for each of the prescribed properties given in Section 5 are as follows: Failure to meet these requirements shall constitute failure to meet the resistivity conformance criterion. 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, c2 Table 2for the respective number of units in the sample, a second sample equal to n2 shall be taken and the total defects of the n plus n2 units shall not exceed the allowable defect number, c2.
Failure to meet this requirement shall constitute failure to meet the dimensional conformance criterion. 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.
Failure of more than one specimen shall constitute failure to meet the weight criteria. If only one specimen fails to meet the weight criteria, four additional specimens from the lot shall be tested, all of which shall conform to the weight criterion. However, any individual production unit, the specimen from which failed the weight criteria, shall be rejected.
The number of units in the sample showing nonconformance to the requirements shall not exceed the allowable defect number, c, in Table 3. Failure to meet this requirement shall constitute failure to meet the packaging conformance criterion. The density of silver shall be taken as The elongation of wire whose nominal diameter is 0. When the latter method is used, the zero length shall be the distance between the jaws at the start of the tension test and be as near 10 in.
The purchaser may accept certi? Each coil shall be gaged at three places, one near each end and one near the middle. From each spool approximately 12 ft 3.
The average of the measurements obtained shall meet the requirements of 5. They shall be tagged or marked to correspond with the coil, spool, or reel from which they were cut. See Explanatory Note 2. Keep the specimens thus cleaned wrapped in a clean, dry cloth until tested. Do not handle that part of the specimen to be immersed in the testsolution. Take care to avoid abrasion by the cut ends. Make the test solution by diluting a portion of the concentrated solution with distilled water to a speci?
A portion of the test solution used for testing samples shall not be considered to be exhausted until it fails to blacken a piece of clean copper as described Explanatory Note 9: A portion of the HCl solution having a volume of mL shall be considered exhausted if it fails to remove within 15 s the discoloration of the silver due to the polysul?
Examine the specimen with the unaided eye normal spectacles excepted against a white background. The specimens shall be considered to have failed if, by such blackening exposed copper is revealed. No attention shall be paid to blackening within 0. These devices offer superior accuracy while performing the measurement in a variety of manners.
NOTE 2—The accuracy of the testing is reliant upon adherence to the procedures for testing that have been developed by the manufacturers as their standard test regimen. There are thickness testing machines available that can be used to perform this measurement.
The use of these devices should be at the mutual agreement of the manufacturer and atm purchaser. The manufacturer shall afford the inspector representing the purchaser all reasonable facilities to satisfy him that the material is being furnished in accordance with this speci? For continuity of coating determinations, the sample shall consist of eight production units. From each unit, one test specimen of sufficient length shall be removed for the performance of the required test.
Packaging and Package Marking The wire shall be protected against damage in ordinary handling and shipping. B98 shall be given to toxicity and? The use of gage numbers to specify wire sizes is not ast, in this speci? An excellent discussion of wire gages and related subjects is contained in NBS Handbook See Table 1 for thickness of coatings for the various classes of coating and wire sizes.
NOTE 5—Cumulative results secured on the product of a xstm manufacturer, indicating continued conformance to the criteria, are necessary to ensure an over-all product meeting the requirements of this speci? The sample size and conformance criteria given for the various characteristics are applicable only to lots produced under these conditions.
G298 7—In general, tested values of tensile strength are increased and tested values of elongation are reduced with increase of speed of the moving head of the testing machine in the tension testing of copper wire. In the case of tests on soft or annealed copper wire, however, the effects of speed of testing are not pronounced.
Tests of soft wire made at speeds of moving head which under no-load conditions are not greater than 12 in. The value of 0. The latter term means that a copper wire 1 m in length and weighing 1 g would have a resistance of 0. This is equivalent to a resistivity value of It is also equivalent, for example, to 1. The equivalent resistivity values in Table 4 were derived from the fundamental IEC value 1? Xstm 9—It is important that the polysul? Atm solution that is not saturated with sulfur or that has been made from decomposed sodium sul?
Therefore, the requirement that the wstm be tested by observing its blackening effect on a bright copper wire is signi? Attention is called also to the necessity for the use of sodium sul? NOTE 10—A lot should comprise material taken from a product regularly meeting the requirements of this speci? Inspection of individual lots of less asstm lb of wire cannot be justi?
NOTE 11—Attention is called to the desirability for agreement between the manufacturer and the purchaser on package sizes that will be sufficiently aastm and yet not so heavy or bulky that the wire may likely be damaged in handling.
ASTM B298 – 12(2017)
NOTE 12—Principle of Operation of the Electronic Thickness Tester— The unit operates by anodically deplating a small surface area of the specimen in a cell containing the test solution. The cell serves as cathode and the piece to be tested is the anode. At the start of the test and until the base metal is exposed, a voltage characteristic of the plating exists across the cell; when all the plating has been removed from the test spot, this voltage changes sharply and assumes a new value which is now characteristic of the base metal.
The time required to dissolve the plating on the test spot proportional to the thickness of the deposit; by correlating the area of the test spot with the current used to strip the plating, the counter is made to read directly in units of thickness.
Essentially, therefore, the electronic thickness tester embodies a miniature reverse-current plating cell in which the piece to be tested is the anode and the cell itself is the cathode. The test solution used is speci? It does not attack the plating unless current is? The anode efficiency is further maintained by providing agitation of the solution in the test cell.
NOTE 13—The equation given for the weight of the silver on the wire is for most purposes sufficiently accurate.