ASTM D5 Standard Test Method for Penetration of Bituminous Materials
4. Summary of Test Method
4.1 The sample is melted (if starting at ambient temperature) and cooled under controlled conditions. The penetration is measured with a penetrometer by means of which a standard needle is applied to the sample under specific conditions.
5. Significance and Use
5.1 The penetration test is used as a measure of consistency. Higher values of penetration indicate softer consistency.
