Gordon England Surface Engineering Forum

Re: Conversion between Rockwell R and Rockwell M

Posted by Gordon England on January 18, 2004 at 01:14:33:

In Reply to: Conversion between Rockwell R and Rockwell M posted by Tieming Ruan on January 16, 2004 at 19:41:25:

: Hi, All:

: I have two plastic materials. One was measured with Rockwell R Scale and the other was measured with Rockwell M Scale. Is there a conversion between these two scales? Otherwise, how can we compare these two plastic materials?

: Thanks a lot!

I have not come across any conversions between these scales. Rockwell R (1/2" ball, 60kg total load) and Rockwell M (1/4" ball, 100kg total load) scales may not even overlap each other.
The R scale is designed for much softer materials than the M scale. Can only suggest that you have both materials tested using the same scale.

Regards Gordon

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