ASTM D1321Standard Test Method for Needle Penetration of Petroleum Waxes
This test method covers the empirical estimation of the consistency of waxes derived from petroleum by measurement of the extent of penetration of a standard needle. This test method is applicable to waxes having a penetration of not greater than 250.
In the standard method, a penetrometer determines the distance of penetration when applying a specified force over a period of 5 seconds. An alternative method to the standard measures the force of penetration at a defined deformation distance of 5 mm.