Technical Glossary Needle Penetration

[Needle Penetration]

A needle penetration test is a method of measuring the hardness of a material.
Measurement is standardized in JIS K2207; a needle of fixed weight is entered vertically into a test piece to indicate the hardness of a material determined from the length it entered. The needle penetration value is given where 1/10 mm is a needle penetration of 1.
Larger numbers mean that a material is more pliable.