JC/T 2268-2014Measurement of copper and other elements in brake friction materials (English PDF)

3.1 Sample Acquisition

3.1.1 Use wool-free paper (for example, thin and soft water-absorbing paper) to wipe

the whole friction assembly. If necessary, repeatedly wipe it, so as to guarantee that there is absolutely no dust or foreign substance on the assembly. Moreover, use deionized water to rinse the assembly, then, use wool-free paper to absorb water.

3.1.2 Measure the thickness of friction material. If there is no steel-back or hoof-iron,

Appendix A (Informative)

Automobile Brake Evaluation Standard

A.1 Type “A” Designated Material

“A + production-year” designated material refers to material whose content of heavy metal and asbestos fiber, which is determined in accordance with this Standard, shall be lower than the requirement in Table A.1.

A.2 Type “B” Designated Material

“B + production-year” designated material refers to material which satisfies the requirement “A”; the copper content, which is determined in accordance with this

Standard, shall be lower than 5% of the requirement. Please refer to Table A.1.

A.3 Type “N” Designated Material

“N + production-year” designated material refers to material which satisfies the requirement “A”; the content of copper and other compounds, which is determined in accordance with this Standard, shall be lower than 0.5% of the requirement. Please refer to Table A.1.

Table A.1 -- Content Requirement of Designated Material

Example 1.material “A15” refers to the material, which is produced in 2015 and satisfies the requirement of Type “A” designated material.

Example 2.material “B16” refers to the material, which is produced in 2016 and satisfies the requirement of Type “B” designated material.

Chemical Elements Material “A” Material “B” Material “N”

Chromium and

Compound/%

Hexavalent Chromium

Salt/%

Lead and

Compound/%

Mercury and

Compound/%

Asbestos Fiber/%

Copper and

Compound/%

......