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ASTM B267-07

(Specification)

Standard Specification for Wire for Use In Wire-Wound Resistors

Standard Specification for Wire for Use In Wire-Wound Resistors

ABSTRACT
This specification covers round wires and ribbons with controlled electrical properties made from magnetic and nonmagnetic class 1a-11 alloys. 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 not for use as electrical heating elements. 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. The nominal resistance per unit length for a round wire is calculated from the nominal resistivity and nominal cross-sectional area.
SCOPE
1.1 This specification covers round wire and ribbon with controlled electrical properties for use in wire-wound resistance units and similar applications, but not for use as electrical heating elements.
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.
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 become familiar with all hazards including those identified in the appropriate Material Safety Data Sheet (MSDS) for this product/material as provided by the manufacturer, to establish appropriate safety and health practices, and determine the applicability of regulatory limitations prior to use.

General Information

Status
Historical
Publication Date
30-Apr-2007
ICS
29.050 - Superconductivity and conducting materials
Technical Committee
B02 - Nonferrous Metals and Alloys
Drafting Committee
B02.10 - Thermostat Metals and Electrical Resistance Heating Materials
Current Stage
Ref Project

Relations

Replaces
ASTM B267-90(2001) - Standard Specification for Wire for Use In Wire-Wound Resistors
Effective Date
01-May-2007
Replaced By
ASTM B267-07(2013) - Standard Specification for Wire for Use In Wire-Wound Resistors
Effective Date
01-May-2013

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ASTM B267-07 - Standard Specification for Wire for Use In Wire-Wound Resistors
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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation:B267 −07
StandardSpecification for
1
Wire for Use In Wire-Wound Resistors
This standard is issued under the fixed designation B267; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope 4. Alloy Classes
1.1 This specification covers round wire and ribbon with 4.1 Fifteenclassesofalloysarecoveredbythisspecification
controlled electrical properties for use in wire-wound resis- as listed in Table 1.
tanceunitsandsimilarapplications,butnotforuseaselectrical
heating elements.
5. Elongation
1.2 The values stated in inch-pound units are to be regarded
5.1 The wire shall conform to the requirements for elonga-
as standard. The values given in parentheses are mathematical
tionasprescribedinTable1,whentestedona10-in.(254-mm)
conversions to SI units that are provided for information only
length.
and are not considered standard.
6. Resistivity
1.3 This standard does not purport to address all of the
safety concerns, if any, associated with its use. It is the
6.1 The bare wire shall conform to the requirements for
responsibility of the user of this standard to become familiar
nominal resistivity as prescribed in Table 1.
with all hazards including those identified in the appropriate
6.2 Actualresistivityshallnotvaryfromnominalresistivity
Material Safety Data Sheet (MSDS) for this product/material
by more than 65% for Alloy Classes 1 to 4 inclusive, and
as provided by the manufacturer, to establish appropriate
610% for Alloy Classes 5 to 11 inclusive.
safety and health practices, and determine the applicability of
regulatory limitations prior to use.
7. Nominal Electrical Resistance per Unit Length
2. Referenced Documents
7.1 The nominal resistance per unit length for round wire
2
2.1 ASTM Standards:
shallbecalculatedfromthenominalresistivityandthenominal
B63Test Method for Resistivity of Metallically Conducting
cross-sectional area.
Resistance and Contact Materials
NOTE 1—When ribbon or flat wire is produced by rolling from round
B77Test Method for Thermoelectric Power of Electrical-
wire, the cross section departs from that of a true rectangle by an amount
Resistance Alloys
depending on the width-to-thickness ratio and the specific manufacturing
B84Test Method for Temperature-Resistance Constants of practice. The conventional formula for computing ohms per foot and feet
perpoundistoconsiderthecrosssectionas17%lessthanatruerectangle
Alloy Wires for Precision Resistors
when width is more than 15 times the thickness and 6% less than a true
rectangle in other cases. This is not valid in view of modern rolling
3. Significance and Use
equipment and practices, but still is widely used as a basis of description.
3.1 This specification on wire and ribbon contains the
Ribbonactuallyismadetoaspecifiedresistanceperfoot,andnotolerance
generic chemistry and requirements for resistivity, temperature isspecifiedforthickness.Analternativeandacloserapproximationwould
be that for ribbon rolled round wire, the electrical resistance would be
coefficient of resistance, thermal emf versus copper resistance
calculated on a cross 6% less than a true rectangle.
tolerances, and mechanical properties of bare wire, as well as
thewireenamelsandinsulationsofalloysnormallyusedinthe
8. Temperature Coefficient of Resistance
manufacture of wound resistors.
8.1 The change in resistance with change in temperature,
expressed as the mean temperature coefficient of resistance
1
This specification is under the jurisdiction of ASTM Committee B02 on
Nonferrous Metals and Alloys and is the direct responsibility of Subcommittee basedonthereferencetemperatureof25°C,shallbewithinthe
B02.10 on Thermostat Metals and Electrical Resistance Heating Materials.
limits specified in Table 1, Columns 4 and 6, over the
Current edition approved May 1, 2007. Published June 2007. Originally
corresponding temperature ranges specified in Columns 5 and
approved in 1952. Last previous edition approved in 2001 as B267–90(2001).
7. The mean temperature coefficient of resistance referred to
DOI: 10.1520/B0267-07.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or 25°C is defined as the slope of a chord of an arc. This slope is
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
determined from the following equation:
Standards volume information, refer to the standard’s Document Summary page on
6
the ASTM website. α 5 ∆R/R ∆T 310
~ !
m 25
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

---------------------- Page: 1 ----------------------
B267−07
TABLE 1 Classe
...

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