Standard : ASTM D 5, BS 2000

Used to determine the grade of bitumen. The penetration tests determine the consistency of bitumen for the purpose of grading. Depth in units 1/10 of millimetre to which a standard needle having a standard weight will penetrate vertically in A duration of five seconds at a temperature of 25° C determines penetration for gradation.

Specification

It consists of a vertical pillar mounted on a base provided with levelling screws. The head together with dial plunger rod a cone (or needle) slides on a pillar and can be clamped at any desired height. A rack and pinion and pointer assemble provide fine adjustment of needle or cone tip to sample. It incorporate a clutch mechanism. Which makes the reading of penetration and subsequent resetting a simple and accurate operation. The dial is graduated in 400 1/10 and the millimetre subdivisions and the needle pointer against figures make easy reading. Supplied with a bitumen penetration needle, ring weight one every 50 gms .and 100 gms. two sample containers.