Scleroscope hardness test


This is a method of testing metal and seal face hardness.

Although widely used in industry we seldom find this method used in the seal business. In this test we let a weight with a hard round end fall ten inches (255 mm) through a glass tube. We get our reading from determining how high the weight bounced off the test sample. The harder the material, the higher the bounce.

The tube on the scale is marked in 140 increments. On this scale, glass would read 130 and hardened steel would record about 110.

The Rockwell “C” test is the most popular in the sealing industry.


  • On February 17, 2018