Cutback Bitumen (Medium & Rapid)

Cutback Bitumen ( Liquid Bitumen )

is Bitumen that is dissolved in a solvent. Typical solvents include Naptha, gasoline and kerosene, white spirit etc. The type of solvent controls the curing time while the amount determines the viscosity of the Cutback Bitumen.

The advantage Cutbacks have over Emulsions is a much higher residual Bitumen percent, typically over 80% compares with over 40-65% for Bitumen emulsions. The result is more Bitumen left on the roadway after curing, for the same volume of binder applied.

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Cutback Classification

Cutbacks are divided into two classifications, Rapid-Curing (RC) and Medium-Curing (MC) depending on the solvent used. They are further defined by a number which indicates the minimum kinematic viscosity (fluidity) of the cutback.

Grades & Properties

GradeCuring SpeedViscosityPenetration of Residue
MC 30Medium30-60120- 150
MC 70Medium70-140120- 150
MC 250Medium250- 500120- 150
MC 800Medium800- 1600120- 150
MC 3000Medium3000- 6000120- 150
RC 70Rapid70-14080- 120
RC 250Rapid250-50080- 120
RC 800Rapid800- 160080- 120
RC 3000Rapid3000- 600080- 120

*Kinematic Viscosity at 140 deg F ( 60 deg C), in Centistokes, Penetration of Residue at 77 deg F (25 deg C) , 100 grams, 5 seconds


Cutback bitumen’s suitable for primer sealing can also be used in the manufacture ofpre-mix asphalt, which is used in patch repairs.Cutback bitumen’s are used extensively in sprayed sealing applications, particularly in cooler weather where theyprovide improved initial stone retention due to their lower viscosity. Typically, a single application of the appropriate cutback bitumen is sprayed onto the primed pavement ontowhich aggregate is laid.


Kinematic 1 viscosity @ 60°C,e  St30/6070/1403000/50000ASTM D1270 /AASHTOT201
Flash Point ( Tag Open- Cup), ° C383836ASTM D1310 / AASHTO T79
Distillation Test°@360 °C
Residue from distillation to 360 °C, Percent volume by different50%55%80%ASTM D402 / AASHTO T55
Test on residue from distillation
Viscosity at 60° C300-1200300-1200300-1200ASTM D2170 /AASHTOT201
Penetration at 25 ° C, 100g, 5 Sec120/150120/150120/150ASTM D5 / AASHTO T49
Ductility 3 at 25 ° C>100>100>100ASTM D113 / AASHTO T51
Solubility in trichloroethylene99.00%99.00%99.00%ASTM D2402 / AAHTO T44
Water, Percent Volume0.20%0.20%0.20%ASTM D95 / AASHTO T55


Flash point(open tag)deg C272727ASTM D3143
Kinematic Viscosity at 60decC (mm 2/3)306070140250500800160030006000ASTM D2170
Distillate to 360 dec CASTM 402
to 190 dec C1510
to 225 dec C55503515
to 260 dec C7570604525
to 315 dec C9085807570
Residue from Distillation5055657580
to360dec C, Volume % by diffrence test on residue from distillation
Penetration @25deg C,100g 5s, (0.1 mm)8012080120801208012080120ASTM D5
Ductility@25decC100100100100100ASTM D113
Solubility in trichloroethylene9999999999ASTM D2042
Water by volume0. D95

Standard Seaworthy Exportable Packing in200 Kg Reconditioned Drums
Palletizing is required for Cutback Bitumen & Emulsions -200kg drums shall be secured as 4 drums per pallet

Steel Drum Sizes
Drum Size 200 kg Drum
Height 980mm
Diameter 520 – 550mm
Thickness 0.6 – 0.8mm

Net PackingWeight  per  20 Foot Container
200 KgIn Metric TonnesPer DrumNo of Drums
Net Weight-Palletized16.00 Mt  (+/- 3%)200kgs (+/- 3kgs)80
Gross Weight-Palletized17.40 Mt  (+/- 3%)215kgs (+/- 3kgs)20



Surface DressingAn application of binder on the road surface by a bitumen distributor followed by a covering of aggregates/chippings spread by a hopper gritter. Can be a single or double layer surface dressingEmulsion : RS-3K Cut Back : MC -3000
Prime CoatingAn application of binder on a granular base to prepare for an asphalt surfacing .Normally a slow setting emulsion or cutback is used for better penetration purposes to seal off the road base. The rate of application can vary from 0.4-1.4 liter/m2Emulsion: SS-IK Cut back : MC-30 MC -70
Tack CoatingA very light application of binder –hand or machine sprayed –to ensure bonding between the existing layer and the new overlay. The rate of application is normally between 0.25-0.7 liter/m2,depending on the surface being sprayedEmulsion:K1-40 : RS-1K : RS-2K
Semi –Grouting /Penetration MacadamAn application of hot binder on a compacted layer of coarse aggregateEmulsion : RS-3K : MC-3000 Other : Bitumen
Slurry SealingA maintenance technique where specially tailored emulsion ,aggregates ,water, and /or mineral filler is mixed in an on-site distributor and spread on an existing road surface at a thickness of 3-6 mm .It is both a preventive and corrective maintenance method for sealing of surface cracks, water –proofing asphalt surfaces and stopping oxidationEmulsion : ALFA/SS
Fog Sealing /Mist SprayingIt is similar to tack coating in that is a very light application of diluted emulsion for renewal/rejuvenation of old asphalt surfaces. The emulsion is usually diluted to a concentration of about 25-30% binder and applied at a rate of 0.3-0.8 liter/m2Emulsion : K1-40 : SS-1K : ALFA
Dust BindingA light application of 0.5-2.0 liter/m2 using diluted bitumen emulsion for dust control on unpaved roadsEmulsion : K1-40 : SS-1K
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