ASTM B Standard Specification for Wire for Use In Wire-Wound Resistors. ASTM-B – Download as PDF File .pdf), Text File .txt) or read online. Non Ferrous Standard. This specification covers round wires and ribbons with controlled electrical properties made from magnetic and nonmagnetic class 1a alloys.

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No further reproductions authorized. The surface of the coating shall be smooth and uniform. It is informational only and not an official part of the standard; the full text of the standard itself must be referred to for its use and application.

Historical Axtm s – view previous versions of standard. Your comments are invited either for revision of this standard or for additional standards and should be addressed to ASTM International Headquarters.

B — 07 ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentioned in this standard. C The maximum temperature values listed apply to the alloy wire only. Users of this standard are expressly advised that determination of the validity of any such patent rights, and the risk of infringement of such rights, are entirely their own responsibility. D in Diameter in.

A number in parentheses indicates the year of last reapproval. Each bare wire should conform to the requirements for nominal resistivity, elongation, thermal electromotive force with respect to copper, and the temperature coefficient of resistance contained in this specification.

Maximum indicates the maximum deviation from zero and the plus or minus sign the polarity of the couple. Permissible Variations in Dimensions Values shown for other classes are xstm information only. The mean temperature coefficient of resistance referred to Copyright? This slope is determined from the following equation: The wires and ribbons, which may have insulated coverings or enamel coatings, are recommended for use in wire-wound resistance units like precision resistors and other similar applications, but aastm for use as electrical heating elements.


Alloy Class 1 3 4 5 6 Color purple yellow red pink ivory The test shall be made 2 to 10 min after removal of the wire from the oil, lightly wiping off the excess oil. D If metric sizes are desired, 1 in.

ASTM B267 – 07(2018), Standard Specification for Wire for Use In Wire-Wound Resistors

The second covering shall be wrapped in the opposite direction from the? B — 07 B26 Speci? The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard. This is not valid in view of modern rolling equipment and practices, but still is widely used as a basis of description. Ribbon actually is made to a speci?

If you feel that your comments have not received a fair hearing you should make your views known to the ASTM Committee on Standards, at the address shown below.

Wire larger in diameter than sizes listed in Table 6 may be supplied on spools Table 7 or in coils depending on agreement between the manufacturer and the purchaser. Caution should be exercised pending knowledge of the maximum temperature of use for the coating material involved. Nominal Electrical Resistance per Unit Length 7. It b67 include both single and double coverings.

A superscript epsilon e indicates an editorial change since the last revision or reapproval. Individual reprints single or multiple copies of this standard may be obtained by contacting ASTM at the above address or at phonefaxor service astm. To convert from inches to millimetres multiply by Last previous edition approved in as B — 90 Current edition approved May 1, ASTM does not give any warranty express or implied or make any representation that the contents of this abstract are accurate, complete or up to date.

ASTM B – 07 Standard Specification for Wire for Use In Wire-Wound Resistors

It is the responsibility of the user of this standard to become familiar with all hazards including those identi? Temperature Coefficient of Resistance 8. The electrical resistance per unit length can be determined more accurately than the dimensions of very small wire. Permissible Variations in Electrical Resistance This standard is subject to revision at any time by the responsible technical committee and must be reviewed every?


This specification covers round wires and ribbons with controlled electrical properties made from magnetic and nonmagnetic class 1a alloys. Outside Diameter, max, in. The covering shall be sufficiently closely wrapped so that, when the wire is bent around a mandrel having a diameter ten times the overall diameter of the covered wire, using only enough tension to give an even compact layer, the wrappings will not open enough to make the wire underneath visible to the unaided eye.

The enamel shall not be underbaked so that one turn adheres to the next on a spool. This abstract is a brief summary of the referenced standard. Originally approved in It shall be free from voids or bare spots and have a minimum of back twist.

ASTM B – 07() Standard Specification for Wire for Use In Wire-Wound Resistors

B Alloy Classes 1a, 1b, 1c, 2a, 2b, 3a, 4, and 6 are designed to give a low emf versus copper. Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard. To convert from xstm to kilograms multiply by 0. The tension on the wire shall not exceed one half of its yield strength. All of the information included in this note is based on measurements made in accordance with Test Method B Link to Active This link will always route to the current Active version of the standard.