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Penetration 35-50

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 bitumenous asphalt (low penetration number) can be used for warm weather condition.


The bitumen penetration grade 35/50 is semi hard penetration grade, with penetration between 35 and 50.Which is moastly used in road construction, asphalt pavement and manufacter of hot-mix asphalt.


Specification of penetration bitumen 35-50

Test method



Penetration  @ 25°c

IP 49



Softening point °c

IP 58



Kinematic Viscosity @ 135⁰C

IP 370


400 min

Flash point °c

IP 36


240 min

Solubility is CS2(wt) %

IP 47

wt. %

99 min