Hardness tester covers more standards
An
Indentec Hardness Testing Machines product story
Edited by the Engineeringtalk editorial team
Mar 22, 2004
Indentec has enhanced the capability of its best selling 4150 LK Rockwell hardness tester to include compliance with ASTM D785-93 and the European equivalent ISO2039-2.
Indentec has enhanced the capability of its best selling 4150 LK Rockwell hardness tester to include compliance with ASTM D785-93 and the European equivalent ISO2039-2 in addition to the more common ISO6508-2 and ASTM E18.
This makes it an ideal choice for customers who are required to test both plastic and metal components.
The unit has been designed for a plastics institute in China who plan to use it in the development of new materials and as a quality control tool for existing products.
ASTM D785 defines two procedures for performing Rockwell hardness measurements on plastic and electrical insulating materials.
Procedure A equates to a standard Rockwell test but specifies R, L, M and E scales with extended full load and recovery dwell times.
Procedure B specifies a 60kgf test force and a 0.5in diameter steel ball as for the HRR scale, but requires the indentation depth to be measured with the major load still applied and designates this scale as HR-alpha.
The "spring constant" or "correction factor" is stored by the measuring system during calibration so that the operator does not have to subtract this factor from the displayed result.
This machine allows the operator to select either of the two test methods and is designed to have an extended measuring range to accommodate softer plastic materials.
The LK range of hardness testers includes: nose mounted indenter to ensure good visibility around the test area and easy access into awkward locations, for example inside a tube; hard wearing membrane keypad for data entry and test setup; dot matrix LCD; upper and lower tolerance settings; calculation of average and standard deviation; hardness conversions either ASTM E140 or DIN50150; correction factors for internal and external diameters; UKAS accredited indenters, test blocks and calibration; and is easy to calibrate both directly with load cells and slip gauges and indirectly with test blocks.
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