Writer：Anonymous 2020-02-24 17:06:31
What is a rubber hardness tester
Hardness tester is an international standard for hardness measurement of rubber, plastic and other non-metal materials. Hardness testers are described in the ASTM D2240 specification, which is a recognized specification for instruments and test procedures.
Rex Gauge Hardness Tester
Rex hardness testers are known all over the world for their quality, reliability and accuracy. Unless otherwise specified, all meters are in compliance with ASTM D2240. All are in stock for immediate delivery. Custom-designed meters and consoles are available as well as many accessories.
For a simple operational check, read on smooth glass or steel plate (Warning: This is not a recommendation for Type D DUROMETERS-the instrument may be severely damaged). The reading of the meter should not exceed 100 and not less than 99. In Rex hardness testers, the unique built-in linearity ensures that the meter operates normally throughout the scale. If the Rex hardness tester does not give the above reading on a smooth, hard surface, it can be assumed that the hardness tester is damaged and should be sent to Rex for inspection and / or repair.
Hardness tester blocks allow users to develop the appropriate "feel". The test block cannot be used for calibration purposes, but it does allow the user to quickly check the correct operation of the hardness tester.
The hardness tester measures hardness by penetrating the indenter into the specimen, and because the indenter stroke may reach .100 ", the specimen must have sufficient thickness to ensure a correct and sensitive test. Generally, the thickness of the specimen Should not be less than 1/4 "(6mm). Since the stroke of the indenter is less than half, it is possible to make exceptions for harder materials. What must be avoided is a specimen so thin that the indenter can sense the hardness of the underlying surface. This will give false readings due to the "anvil effect". When inspecting materials less than 1/4 "(thin to .050"), a Rex Type M hardness tester can be used.
When testing flat samples that are too thin to provide accurate readings, the samples can be stacked to provide the desired thickness.
In addition to sufficient test thickness, sufficient material must be present around the sides of the indenter. Use a soft material, and a minimum of 1/4 inch (6 mm) is recommended.