Nayara Energy

Bitumen (Viscosity Grade) (VG 30, VG 40)

India has traditionally used penetration grade bitumen as a binder for road construction. To increase the lifespan of highways, reduce maintenance costs, and handle the load of today's traﬃc, MoRTH, in consultation with BIS, has revised from penetration grade to viscosity grade bitumen.

Viscosity Grade Bitumen Facilities

BASED ON FUNDAMENTAL ENGINEERING PROPERTY

Predictable performance

PERFORMS WELL UNDER LARGER TEMPERATURE RANGE

Less rutting
at high temperatures,
less cracking at low temperatures

HIGHER STRESS

Can handle higher traﬃc,
can handle higher
axle loading without rutting

BETTER MIX DESIGN

Better method of choosing
binder grade

SIMPLER & RELEVANT TESTS

Lower number of tests,
cheaper testing cost

Applications

VG 10 Surface dressing, Paving in very cold climate

VG 20 grade is used for paving in cold climates and high-altitude regions

VG 30 Warmer temperature, heavy traffic loads & heavy duty pavements

VG 40 Higher temperature and heavy traffic roads, Highly stressed areas (intersections, near toll booths and truck parking lots)

Due to its water-resistant properties, it is also used for roofing

Our Bitumen Facilities

Production

Nayara produces bitumen from its
reﬁnery at Vadinar and markets it in bulk.
It is obtained as a residual product in petroleum reﬁnery.

Customer service

Dedicated sales team for customer delight

Support in troubleshooting

Quality

Stringent quality control at all stages

State of the art quality control lab

Speciﬁcations

Viscosity grading classiﬁes bitumen on the basis of a fundamental engineering parameter.

VISCOSITY GRADE SPECIFICATION OF BITUMEN AS PER IS 73:2013 (FOURTH REVISION)

PARAMETER	UNIT	LIMIT	VG-10	VG-20	VG-30	VG-40
Suitability based on 7 day avg max air temperature	range	range	< 30	30-38	38-45	> 45
Absolute Viscosity at 60°C	min	min	800-1200	1600-2400	2400-3600	3200-4800
Kinematic Viscosity at 135°C	min	min	250	300	350	400
Flash point	min	min	220	220	220	220
Solubility in Trichloroethylene	min	min	99	99	99	99
Penetration at 25°C, 100g, 5s	min	min	80	60	45	35
Softening point (R&B)	min	min	40	45	47	50
TESTS ON RESIDUE FROM THIN FILM OVEN TEST/RTFOT Viscosity Ration at 60°C	--	max	4	4	4	4
Ductility at 25°C	cm	min	75	50	40	25

Viscosity vs. Penetration Grading

Parameter	Viscosity Grade	Penetration Grade
Grading basise	Fundamental engineering parameter	Empirical parameter
Test temperature	Measures at both 60°C & 135°C	Measures only at 25°C
Predictability of performance	Any two VG grade bitumen will exhibit similar performance	Not predictable
Handling	Easier for mixing and compacting as resulting mix is predictable	Not predictable
Mixing	Viscosity at mixing temperature available	Not available
Operational performance	Wide range of temperature	Narrow range
Tests	7nos. - All tests have relationship with field performance	14nos. - Many do not correlate with field performance
Testing	Faster and cheaper	Time consuming and expensive