The Durometer is the International
Standard Instrument used to measure the hardness of rubber or
rubber-like materials. Durometers measure hardness by the penetration of
an indentor into the rubber sample. The calibrated reading is expressed
in a number value. The hardness values are always expressed in terms of
plus or minus (±) five points (example: 60±5 Durometer).
It is important to note that when testing hardness of a rubber sample,
the material should not be less than ¼" thick (.250").
The above values are approximate and
are not to be used as an exact equivalent. This information is provided
as a selection guide only.
Here are a few examples of hardness based on Durometer scale:
- Rubber band: 35 Shore A
- Rubber tire: 55 Shore A
- Rubber shoe heel: 70 Shore A
- Typewriter platen: 95 Shore A
