JB/T 8987-2017Technical requirements for silver-copper alloy wires (strips) for commutators (English PDF)
换向器用银铜合金线（带）材技术条件
This is a limited preview
Buy now to download the full PDF (15 pages)
Need quotation for your management?
Get a formal quotation for JB/T 8987-2017 in 30 minutes.
Issued by
MIIT
Level / Type
Industry · Recommended
Issue date
November 7, 2017
Implementation date
April 1, 2018
Scope
JB/T 8987-2017 is the English-translated version of 换向器用银铜合金线（带）材技术条件.
JB/T 8987-2017 is the Chinese standard "Technical requirements for silver-copper alloy wires (strips) for commutators". Its scope clause reads: This standard specifies the product variety and code, technical requirements, test methods, inspection rules, marking, packaging, transportation, storage of silver-copper alloy wire (strip).
This standard applies to the production, inspection, acceptance of silver-copper alloy wire (strip). Silver-copper alloy wire (strip) is used to manufacture silver- copper commutator.
The silver-copper commutator is mainly used in low-power motors for power tools, household appliances, other industrial appliances. Its clauses include product variety and code; test methods.
Found what you need?
Document preview — JB/T 8987-2017
National Standard of the People's Republic of China
- Replacing
- JB/T 8987-1999
Issued by: Ministry of Industry and Information Technology of the People's Republic of China
Contents
- Foreword3
- 1 Scope4
- 2 Normative references4
- 3 Product variety and code4
- 4 Technical requirements5
- 4.1 Raw materials5
- 4.2 Appearance5
- 4.3 Dimensions and limit deviation6
- 4.4 Chemical composition, mechanical-physical properties7
- 4.5 Delivery status7
- 5 Test methods7
- 5.1 Appearance7
- 5.2 Dimension7
- 5.3 Chemical composition7
- 5.4 Conductivity7
- 5.5 Density8
- 5.6 Hardness8
- 5.7 Tensile strength and elongation at break8
- 6 Inspection rules8
- 7 Marking, packaging, transportation, storage8
- 7.1 Product’s marking8
- 7.2 Packaging9
- 7.3 Transportation9
- 7.4 Storage9
- References10
1 Scope
This standard specifies the product variety and code, technical requirements, test methods, inspection rules, marking, packaging, transportation, storage of silver-copper alloy wire (strip).
This standard applies to the production, inspection, acceptance of silver-copper alloy wire (strip). Silver-copper alloy wire (strip) is used to manufacture silver- copper commutator. The silver-copper commutator is mainly used in low-power motors for power tools, household appliances, other industrial appliances.
2 Normative references
The following documents are essential to the application of this document. For the dated documents, only the versions with the dates indicated are applicable to this document; for the undated documents, only the latest version (including all the amendments) are applicable to this standard.
GB/T 228.1 Metallic materials - Tensile testing - Part 1: Method of test at room temperature
GB/T 4340.1 Metallic materials - Vickers hardness test - Part 1: Test method
GB/T 5121.1 Methods for chemical analysis of copper and copper alloys -
Part 1: Determination of copper content
GB/T 5121.19 Methods for chemical analysis of copper and copper alloys -
Part 19: Determination of silver content
GB/T 5586 Test methods for essential property of electrical contact materials
JB/T 5351-2014 Electric contact material for vacuum switch - Test methods of essential property
3 Product variety and code
According to the different silver content, the product varieties and product codes of the silver-copper alloy wire (strip) are as shown in Table 1 and Table 2.
4.4 Chemical composition, mechanical-physical properties
The chemical composition and mechanical-physical properties of the silver- copper alloy wire (strip) are as specified in Tables 1 and 2, respectively.
4.5 Delivery status
The silver-copper alloy wire (strip) is one piece per coil. The weight of each coil is not less than 50 kg. It may also be agreed between the supplier and the purchaser.
5 Test methods
5.1 Appearance
The appearance of silver-copper alloy wire (strip) is visually observed in natural light.
5.2 Dimension
The diameter of the silver-copper alloy wire is measured by a gauge which has an accuracy of not less than 0.02 mm. The thickness of the silver-copper alloy strip is measured by a gauge which has an accuracy of not less than 0.005 mm.
The width is measured by a gauge which has an accuracy of not less than 0.02 mm.
5.3 Chemical composition
5.3.1
The total content of copper and silver shall be determined in accordance with the provisions of GB/T 5121.1.
5.3.2
The silver content is determined by atomic absorption spectrophotometry according to the provisions of GB/T 5121.19.
5.3.3
The oxygen content is determined according to 3.4 of JB/T 5351-2014. It is sampled from wire blank.
5.4 Conductivity
According to the provisions of 3.3 of JB/T 5351-2014, determine the […]
7.1.2
Each coil of silver-copper alloy wire (strip) shall be accompanied by a
certificate of conformity. The certificate includes:
- Supplier’s name, material name (code), specifications;
- Batch number, weight, number of pieces, standard executed;
- Silver content, oxygen content, conductivity, density, hardness;
- Date of inspection, conclusion of inspection;
- Inspector’s seal (or code).
7.2 Packaging
Each coil of silver-copper alloy wire (strip) is wrapped by a soft material, to prevent bumping of the surface of the material.
7.3 Transportation
During transportation of product, it shall take moisture-proof and rain-proof measures.
7.4 Storage
The product shall be stored in a dry, ventilated, acid-free indoor environment.
......
This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 15 pages — is available in the English PDF.
Similar standards
Editions of JB/T 8987
| Edition | Title | Revision | Status |
|---|---|---|---|
| JB/T 8987-2017 | Technical requirements for silver-copper alloy wires (strips) for commutators | current edition | Current |
| JB/T 8987-1999 | Technical requirements for silver-copper alloy wires (strips) for commutators | previous edition | Superseded |
This page sells the current edition, JB/T 8987-2017. Earlier editions are listed for reference only.
How to Download JB/T 8987-2017
- 1
Add to cart
Click "Download PDF" on this page and choose "Buy this standard". You can add more standards before checkout.
- 2
Checkout
Enter your email and billing details. Payment is processed securely by Stripe (cards or bank transfer). Prefer bank details? Request a quotation (min. order $300).
- 3
Instant delivery (0–9 sec)
Delivery is automatic: within seconds of payment you'll receive an email with a secure download link. The link stays valid for 72 hours.
- 4
Invoice included
A tax invoice is attached to the confirmation email. Need a custom invoice? Contact us.
Related Standards
JB/T 10062-2026 — Probes used in ultrasonic flaw detection - Testing methods for performance
JB/T 10096-2026 — Cases for power semiconductor devices - Selection guidance
JB/T 10097-2026 — Case for power semiconductor device
Secure payment via Stripe
Payments accepted
JB/T 8987-2017
$125.00