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JB/T 8987-1999

Chinese Standard: 'JB/T 8987-1999'
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Standard ID JB/T 8987-1999 (JB/T8987-1999)
Description (Translated English) The specification of AgCu alloy wire for commutators
Sector / Industry Mechanical & Machinery Industry Standard (Recommended)
Classification of Chinese Standard K14
Word Count Estimation 4,463
Date of Issue 1999-08-06
Date of Implementation 2000-01-01
Quoted Standard GB/T 466-1982; GB/T 467-1982; GB/T 4340-1984; GB/T 5121.1-1985; GB/T 5586-1985; JB/T 5351-1991
Adopted Standard IEC 60356-1971; NEQ; JIS C2801-1995; NEQ
Drafting Organization Beijing Institute of Electrical Technology and Economy
Administrative Organization National Standardization Technical Committee for Electrotechnical alloy
Summary This standard specifies: silver-copper alloy wire the technical requirements, test methods and acceptance criteria.

JB/T 8987‐1999 
Translated English of Chinese Standard. JB/T8987‐1999 
Wayne Zheng et al. 
K 14
The Specification of AgCu Alloy Wire for
Issued by. China Mechanical Industry Bureau
Table of Contents
Foreword ... 3 
1 Scope ... 4 
2 Normative References ... 4 
3 Product Variety and Code ... 4 
4 Technical Requirements ... 4 
5 Test Methods ... 5 
6 Inspection Rules ... 6 
7 Marking, Packaging, Transportation and Storage ... 7 
This standard is drafted for the AgCu commutator segment material that is used for motor
commutator installed on electric tools, household appliances and other industrial electrical
equipment. The technical specification of this standard is established and based on the
requirements of AgCu commutator segment to the materials specified in the "Dimensions for
Commutators and Slip-rings" (IEC 60356-1971) and the Japanese industrial standard
"Commutator Bars" (JIS C 2801-1995). This standard also makes reference to the
commutator manufacturer's enterprise standards in industrially-advanced countries and the
actual situation of AgCu material applied to commutator products in China in the last decade.
This standard lists the oxygen content as an independent indicator; and makes stricter
requirements than the above-mentioned standards, as the oxygen content directly affects the
cold workability of AgCu material. Because the conductivity varies with cold working rate
and heat treatment state, the conductivity indicator of AgCu wires involved in this standard
during supply cannot represent the conductivity of commutator segment. Therefore, this
standard specifies that the conductivity of wires at annealed state acts as the basis of
This standard is voluntary. Since the issuance and implementation, the ordering and
inspection of AgCu commutator segment materials shall comply with this standard. For many
pure copper commutators currently used in electric tools in China, it may also use the AgCu
alloy wires specified in this standard to fabricate the commutators.
This standard was proposed by and is under the jurisdiction of the National Standardization
Technical Committee of Electrical Alloy.
Responsible drafting organizations of this standard. Beijing Electric Comprehensive
Technology Economics Research Institute, and Anping Electric Alloy Factory.
Participating drafting organization of this standard. Rui'an Electric Alloy Materials Factory.
Chief drafting staffs of this standard. Guo Liping, Chen Miaonong, Du Manyin, Zhao Jifeng,
Zhang Xiulan, and Li Qingmin.
This standard is first-time issued.
Beijing Electric Comprehensive Technology Economics Research Institute is in charge of the
interpretation of this standard.
The specification of AgCu Alloy Wire for Commutators
1 Scope
This standard specifies the technical requirements, test methods, inspection rules and the like
for AgCu alloy wires.
AgCu alloy wires specified in this standard are applicable to the manufacture of AgCu
commutators which are mainly used for the electric tools, household appliances and the small
power motors of other industrial electrical equipment. The AgCu alloy wires specified in this
standard may replace the commutator segment materials of pure copper commutators.
2 Normative References
The following normative documents contain provisions which, through reference in this
standard, constitute provisions of this standard. At time of publication, the editions indicated
were valid. All the standards will be revised, all parties coming to an agreement according to
this standard are encouraged to study whether the latest editions of the following standards
are applicable.
GB/T 466-1982 Classification of Copper
GB/T 467-1982 Electrolytic Copper
GB/T 4340-1984 Metallic Materials - Vickers Hardness Test
GB/T 5121.1-1985 Methods for Chemical Analysis of Copper - The Electrolytic Method
for the Determination of Copper Content
GB/T 5586-1985 Test Method for Essential Property of Electric Contact Material
JB/T 5351-1991 Test Method for Basic Properties of Contact Materials of Vacuum
3 Product Variety and Code
The product variety and code of AgCu alloy wires are listed in Table 1, according to the
different silver contents.
4 Technical Requirements
5.1.3 The analysis of oxygen content shall be carried out with those specified in 3.4 of JB/T
5351. And samples shall be taken from wire billets.
5.2 Determination of I.A.C.S conductivity
The determination of the conductivity of wire billets shall be carried out according to those
specified in 3.3 of JB/T 5351.
5.3 Determination of the density
The determination of density of wire shall be carried out according to those specified in GB/T
5.4 Determination of the hardness
The determination of Vickers hardness shall be carried out according to GB/T 4340. During
the determination, apply a load of 196.1 N. Horizontally place the tested AgCu alloy wire.
Measure at six positions, among which at least five positions shall be in accordance with
those specified in Table 1 in 4.1 of this standard.
5.5 Determination of hot hardness
Place the finished AgCu alloy wire in the chamber-type electric furnace or tube-type
resistance furnace and heat for 1h at 300 ± 15°C. Cool AgCu alloy wire together with the
furnace to the room temperature. Then conduct the hardness determination according to the
requirements stated in 5.4 of this standard.
5.6 Appearance inspection
Inspect the appearance of AgCu alloy wires with the naked eyes.
5.7 Inspection on dimensions and permissible dimension deviation
Select corresponding measuring tools according to the diameter dimension and its deviation
determined by the supplier and purchaser through negotiation.
6 Inspection Rules
6.1 The technical supervision department of the supplier shall conduct the
end-of-manufacturing inspection of AgCu alloy wire products by batches. And fill in the
product warranty and product qualification certificate. The products manufactured with the
same-batch of materials, same-process, and containing the same-silver content shall be
regarded as a batch.
6.2 Each batch of products shall be inspected for their appearance and diameter dimension
coil by coil.
6.3 For each batch of products, one coil of wire shall be sampled for inspection of the silver
content, oxygen content, conductivity, density, and hardness. If it fails in the inspection, the
inspection may be carried out furnace by furnace.
6.4 The silver content inspection shall be carried out furnace by furnace.
6.5 When the material manufacturer, grade or process has been changed, not only the items
specified in 6.2 and 6.3 of this standard shall be inspected but also shall the hot hardness be
6.6 The purchaser may conduct quality inspection on the received products. If the
inspection result has discrepancy with the quality certificate provided by the supplier, it shall
be proposed to the supplier within 2 months upon the receipt of the products. And it be settled
through negotiation by the supplier and the purchaser. If any dispute still exists, it shall be
judged by the arbitration organization, i.e. the relevant ministry-level material detection
centers or higher agency.
7 Marking, Packaging, Transportation and Storage
7.1 Product marking
Each coil of wire shall be equipped with a label as the product mark. The content......
Related standard: JB/T 8987-2017    JB/T 8633-2017
Related PDF sample: GB/T 38090-2019