This site is operated by a business or businesses owned by Informa PLC and all copyright resides with them. Informa PLC’s registered office is 5 Howick Place, London SW1P 1WG. Registered in England and Wales. Number 8860726. Measuring the “hardness” of soft, spongy elastomers—foams—is an inexact science. There is usually a surprisingly broad spread in the data normally provided by devices such as a durometer, a tool for measuring hardness. There are also a number of variables that can scatter the readings even more. These variables include operator technique, geometry of the test specimen, and even ambient temperature and humidity. To accommodate such variables, material specifications usually permit a tolerance of ±5 points on the scale of the measuring device. But sometimes even a 10-point spread is not enough to provide satisfactorily comparable readings on identical samples measured by technicians in different labs. 2d Shape Cutting Machine The best known device used for measuring hardness of elastomers and rubbers is the Shore A durometer. It is intended for use on materials as soft as a baby-bottle nipple or as hard as the heel of a shoe. It uses an indento...