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The woven "A-Block" material is a premium non-asbestos brake lining developed especially for oil field use on draw-works, well servicing and drilling rigs. Extensive field evaluations confirm that this product provides outstanding performance in this demanding application area. It exhibits smooth, long lasting trouble-free service with excellent burnishing or bedding-in properties with reduced abrasion for increased rim life. This premium performance material is available in the form of custom sized slabs or rolls.
Unit of Measure

Mechanical Properties

Specific Gravity (SAE J380)

 N/A 1.23

Minimum Tensile Strength (ASTM D638)

 N/A 2500 psi

Frictional Properties

Normal Coefficient of Friction (SAE J661)

 N/A 0.50

Hot Coefficient of Friction (SAE J661)

 N/A 0.41

Maximum Wear Rate (SAE J661)

 N/A 0.006 in³/hp-hr

Friction Code

 N/A GF

Maximum Operating Rubbing Speed Limits

 N/A 5000 ft/min

Maximum Operating Pressure Limits

 N/A 200 psi

Drum Temperature for Constant Operation

 N/A 550 ºF

Characteristics

N/A

  • Excellent burnishing property
  • Uniform friction
  • Non-abrasive
  • Premium life characteristics
  • High tensile strength

Note

N/A For Normal and Hot Coefficient of Friction (SAE J661):
Friction values shown are for guide purposes only since values deviate with changes in temperature, pressure and speed. Practical design should include a 25 to 50 percent safety factor.

For Maximum Operating Rubbing Speed and Pressure Limits:
Rubbing speed, drum temperature, and pressure are directly related. Changing any one value will change the others. The values shown represent typical conditions, but are not the ultimate limits of the material.

For Drum Temperature for Constant Operation:
Rubbing speed, drum temperature, and pressure are directly related. Changing any one value will change the others. The values shown represent typical conditions, but are not the ultimate limits of the material.