» Bitumen » Penetration » Pen-50-70(ASTM)

Penetration 50-70

Penetration grade bitumen is a straight run bitumen specified by the penetration and softening point test. Penetration bituminous asphalt soften at high temperature and harden at low temperature due to Having thermoplastic property. Penetration grade asphalt is manufactured by vacuum distillation of crude oil. The most common grade is bitumen 60/70 which can be used for many applications. The penetration bituminous asphalt with high penetration  numbers which are soft, mostly used in cold weather conditions and hard bituminous asphalt (low penetration number) can be used for warm weather condition.

 

The bitumen penetration grade 50/70 is semi hard penetration grade, with penetration between 50 and 70.Which is moastly used in road construction, asphalt pavement and manufacter of hot-mix asphalt.


Specification of penetration bitumen 50-70

 

Test method

Unit

Specification

Specific gravity @ 25°c

ASTM D70

Kg/cm3


1.01/1.06


Penetration  @ 25°c

ASTM D5


mm/10


50/70


Softening point °c

ASTM D36

°C

46/58

Ductility @25 °c

ASTM D113

cm

100 min

Loss on heating(wt.) %

ASTM D6

wt. %


0.2 max

Drop in penetration after heating %

ASTM D5-D6

%


20 max

Flash point °c

ASTM D92

°C

250 min

Solubility is CS2(wt) %

ASTM D4

wt. %

99.5 max

Spot test

A.A.S.H.O.T102


negative