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Colbond 50

Colbond 50 is nominally a 50% binder content polymer modified bitumen emulsion.

Colbond 50 forms a uniform film of polymer modified bitumen on the road surface which promotes a strong adhesive bond between a bituminous overlay and the existing surface. The application of Colbond 50 also improves the waterproofing of the road pavement.

Colbond 50 has been designed specifically for thin and ultra-thin overlays. Colbond 50, when fully broken, prevents 'pick-up' on the wheels, tracks or tyres of the paver/delivery vehicles and prevents disbonding of the overlay during subsequent service life when subjected to traffic stresses.


Properties of Colbond 50
Emulsion viscosity ~4° Engler
Emulsion binder content 50%
Recovered binder minimum Peak Vialit Cohesion >1.0J/cm2


Surface to be sprayed must be free from weeds, standing water, loose material and oil spillage.


Prior to application Colbond 50 should be homogenized thoroughly. Colbond 50 should be applied at between 0.3 and 1.4 litres per square metre depending on the application. Vehicular traffic should be kept off the treated area until the emulsion has fully broken, (colour changes from brown to black), then apply the overlay. Only apply Colbond 50 when the ground temperature is above 5°C and rising or less than 40°C.

Humidity should preferably not exceed 70%. Colbond 50 can be applied in higher humidity but this will prolong the break time. Because the base binder used in Colbond 50 is polymer modified, it behaves differently from conventional bitumen emulsions.

It may therefore be necessary to warm the Colbond 50 to ease application.When applying through small motorised or petrol driven units, ensure the sprayer system is flushed regularly. This is of particular importance when impeller driven pumps are used. For further information please contact our Colas Technical Department on (01342) 711000.


Protect from frost. Drums should be rolled frequently to avoid separation. For further information please refer to BS434: Part 2: 2006 Section 5; Clause 5.2. 'Storage'.


Colbond 50 complies with the requirements of an Intermediate Grade Binder in accordance with Clause 920 of The Specification for Highway Works.


Colbond 50 is available in 200kg drums or bulk.


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