Wheeling Brake Block Mfg. Co.
PRODUCT DATA SHEET
Typical properties of NA 2121

GENERAL DESCRIPTION TEST REPORT
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  Non asbestos dry mix formula, dark gray in color.  
  Similar features of NA-2222. Visible kevlar fibers at edges,
keyways and drilled holes..		  
PHYSICAL AND CHEMICAL PROPERTIES
1. Specific Gravity 2.0
2. Gogan Hardness 35
MECHANICAL PROPERTIES
1. Service Condition DRY
2. Maximum recommended operating pressures 750 PSI
3. Maximum recommended rubbing speed 7,500 FPM
4. Maximum recommended operating temperature 750° F
5. Average Coefficient of Friction @250 psi 7,500 FPM and 450° F .35
6. Wear rate per horsepower hour @350° F 2.5 %
7. Spike Temperature 850° F
8. Dynamic Coefficient .33=G
9. Static Coefficient .34=G
All lab results shown are 1/4" thick molded flat bars. Properties may vary with thickness, shape and operating conditions.
NA-2121 is a new formula designed for a high side low friction material. This designed friction accommodates high speed drum FPM rotations. NA-2121 has built in slip characteristics, the "No Grab" effect brake blocks. Particular applications call for lining specs to "slip the clutch or brake" into motion. This material gives operators feather touch control without erratic friction. Large mining equipment uses this material on swing frictions and hoist brake applications. NA-2121 works well with keylock, nut insert and drilled brake blocks. Also used in "Combination Friction Sets" with NA-2424 and NA 6504, depending on the application.

Independent testing laboratory results:
"LINK ENGINEERING" Detroit, MI

 Click on Chart to Enlarge

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