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Hardness Measurement in Industry

Tassanai Sanponpute Head of hardness and

torque laboratoriesNational Institute of Metrology (Thailand)

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Most products around us today, related to the Most products around us today, related to the measurement of hardness. measurement of hardness.

What is Hardness ?

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Medicine tablet

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Hardness of coins

Should be 70 HV to 95 HV

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Green sand mold

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Hardness of wood

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Welding parts

Vickers hardness test

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Carburizing Part

• Increased surface hardness • Increased wear resistance • Increased fatigue/tensile

strengths

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Carburizing Part

• Case hardness test

Vickers hardness test

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Carburizing Part

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Gem and Mineral

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Moh’s hardness testMoh’s hardness test

• Moh’s hardness standard

Gem and Mineral

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Coating nano-hardness test

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Coating micro-hardness test

-Micro-Vickers-Knoop hardness test

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Concrete Test

The rebound is dependant upoThe rebound is dependant upon the hardness of the surface un the hardness of the surface under test, the harder the surfacnder test, the harder the surface the higher thee the higher therebound and visa versa.rebound and visa versa.

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Rubbers, Plastics

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Sheet metal and automobile

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Sheet metal and automobile

• Rockwell hardness test

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Massive and irremovable parts

• Portable hardness

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Thank you for your kind attentionsThank you for your kind attentions