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See Chinese contents: GB/T 4985-2021 GB/T 4985-2021: Standard test method for needle penetration of petroleum waxes
This document describes a method for evaluating wax hardness by measuring the depth of penetration of a standard needle into a wax specimen. This document is applicable to petroleum wax with a needle penetration value not greater than 250 1/10 mm. It can also be used to determine Fischer-Tropsch wax, synthetic wax and bio-wax, etc. However, this document does not give the precision of determining synthetic wax and bio-wax, etc.
