Cable Ducting

Thermal Cable Grout

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Bentonite (Manufacturing & Supply) Ltd

We have supplied high-quality materials in the UK for over 15 years

We have exclusive batching equipment

We make products faster and in larger quantities than anyone else in the UK

We can pump up to 500 linear metres depending on blend

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Cable Ducting

This process comprises the infilling of ducts that are placed under roads/railway lines/rivers and that have had cables pulled through them.

Pumping in a liquid material that encapsulates the cable allows the heat to be transferred from around the cable to prevent it from overheating. Thermal grouting is an engineering solution to infill a duct with an HT cable insert with a low Thermal Resistivity material.

Heat is the prime enemy of electric transmissions, because it increases wire resistance and shortens the lifespan of the cable insulation. Cross-country transmission lines suspended high in the air from steel towers are not insulated and heat is easily dissipated into the air. But for cables buried in a conduit under the ground, heat is confined.

Correctly applying thermal grout mixes is a critical element in constructing segments of underground power transmission lines. Thermal grout is used to transmit heat from underground electrical cables into the surrounding soil or rock. The correct grade of grout has to be used as defined by the client engineers.

The mix has to be pumpable over long distances but does not set hard.

Find out more about cable ducting from Bentonite (Manufacturing & Supply) Ltd by getting in touch with us today. We’re based in Kent and offer our products and services to customers across the UK.

Case Studies

Find out more about some of the recent projects we have completed, both in our local area of Kent and for clients across the UK.

East Sussex

Construction site with workers wearing safety gear and a yellow excavator digging a trench.
Soilfix Ltd

Details: The site for this particular project was alongside the River Adur near Shoreham Harbour, next to a scrapyard that was the reason for the slurry… Read more


Fleet of Bentonite MS's vehicles
I.D. Corcoran Contractors Ltd

Details: Bentonite (Manufacturing & Supply) Ltd was approached by I.D. Corcoran Contractors Ltd for advice on the infill of decommissioned steam and cable tunnels, along with… Read more



Two green concrete silos
AMS No-Dig/Orsted

Details: Bentonite (Manufacturing & Supply) Ltd was asked to infill three cable ducts with diameters of 800mm with a 250mm cable insert for wind farms located… Read more

Contact us to find out how Bentonite can benefit your next project!

Contact us to discuss your requirements with an advisor on 01474 825 045

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