Operational heat

Our composite brake block won't melt or burn and continues to work at a temperature of 250℃.
It may burn but causes no flame at a temperature of ≥ 400℃.

Materials

A. The materials of composite brake block consist of 3 main substances including reinforcing fiber, organic/inorganic filler and resin bound.
B. It has a high level of uniformity.
C. It can be separated from the backing plate.
D. It contains no asbestos, lead, zinc or other mixtures.
E. It also contains no toxic materials.
F. The hardness of the material is lower than the wheel's.
G. It causes no strong smell in friction.

Backing plate

Backing plate for a trains' composite brake block must meet the following criteria. Firstly, it is made of ST-41 steel plate, and is constructed to transmit the braking force to the composite material. Secondly, there should be a binding structure between the composite material and backing plate, thus forming into a integrated unit and ensuring sufficient bending strength and stiffness.

Performance

• Excessive wear won't be caused on the surface of the wheel and the composite brake block.
• The composite brake block will not cause the wheel porous or cracked.
• It won't stick at the wheel during braking therefore won't cause uneven wheel surface.
• It won't cause wheel slipping during full braking in wet conditions.

Test procedure

Vernier caliper or other methods are used to test the dimension of the brake block.

Laboratory test

• Specific gravity test: standard ASTM D 792 or equivalent method
• Coefficient of friction test: Standard ASTM D 1894 or equivalent method
• Hardness test: standard ASTM D 785 or equivalent method
• Shear resistance test: standard ASTM D 732 or equivalent method
• Press test: Standard ASTM D 695 or equivalent method
• Bending test: Standard ASTM D 790 or equivalent method
• Thermal properties test: standard ASTM D 177 or equivalent method