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What's a durometer?
A durometer is an instrument used for measuring indentation hardness of rubber, plastics and other materials. Durometers are built to various standards from ASTM, DIN, JIS and ISO.
What materials may be tested with a durometer?
Durometers are used to measure the indentation hardness of a great many materials. Rubber, elastomers, plastics, foam rubber, printing rollers, roller blade wheels are all typical durometer applications. Other applications include composite foams, crab shells, thread on bobbins, rolled plastic films and countless other applications and materials. Hard metals such as steel, brass and aluminum should be tested with a metal hardness tester.
How do I use a durometer?
In use, a durometer is pushed against the sample and the hardness is read from the dial.
It is a good practice to take several readings and average the results.
How do I choose the correct durometer?
The ASTM D2240 standard covers type A, B, C, D, DO and OO durometers. The most popular durometers are types A and D. Type A is often used for rubber and soft plastics while type D is used for harder materials such as bowling balls and thermo plastics. If your application is not covered by a type A or type D durometer, one of the others may be used. For a full listing of the different types of durometers and suggested applications see Durometer Specs.
What's the difference between models?
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standard
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ergonomic
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pencil
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electronic
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The choice of style depends on both the application and personal preference. The most popular model for general use is the 'standard' which features a large stable base (1x1-5/8") which is great for general use as well as printing rollers. The 'ergo' model features a medium base (1x1") and a wine glass shaped body which allows access to smaller areas than a 'standard'. Finally there is a 'pencil' model (dial or electronic) which features the minimum size base (1/2" diameter) allowed by the ASTM D2240 standard and although not as stableas a 'standard' or 'ergo' it allows access to the more restricted areas. |
