A durometer is a Tool for testing The hardness of various rubber & plastics. This test method covers twelve kinds of plastic hardness measurement apparatus known as durometers: digital force gauge Forms A, B, C, D, DO, E, O, OO, OOO.
Durometer, such as lots of other hardness evaluations, Measures the thickness of an indentation in the material created by a given force to a standardized presser foot. This thickness depends on the hardness of this material, its viscoelastic properties, the shape of the presser foot, and the length of this evaluation.
ASTM D2240 durometers allow for a Measurement of the primary hardness, or the indentation hardness following a given period of time. The basic evaluation requires applying the drive in a constant fashion, without shock, and measuring the hardness (thickness of the indentation). If your timed hardness is needed, force is used for the necessary time and read. The material under evaluation should be a minimum of 6.4 mm (.25 inch) thick.
Durometers step hardness by about the Penetration of a indentor to a specimen, also since the indentor travel can attain .100″, it follows a noun has to be of adequate depth to ensure a suitable, sensitive evaluation. Exceptions could be made for tougher materials since the indentor is currently at less than half strokes. What should be prevented is that a specimen so? lean the indentor could feel the hardness of their surface. This will provide a false reading because of the”anvil impact”. The Rex Sort M durometer may be used when assessing stuff thinner than 1/4″ (just as skinny as .050″).
- When analyzing flat specimens too lean to give accurate readings, the specimens may be stacked to offer the necessary thickness.
- Along with adequate Thickness for analyzing, sufficient material around the surfaces of this indentormust be found. With soft stuff, a minimum 1/4″ (6mm) Is suggested.