High thermal conductivity
Bestone® thermal sand is specially developed for backfilling high-voltage cables. The material allows the heat released from high cable loads to dissipate quickly and evenly, allowing the cable to continue operating safely and efficiently.
Composition
The product consists of a special grading of sand, silt and loam particles that together provide optimum heat dissipation and high moisture retention capacity.
Specially developed particle size distribution
Bestone® is mined in Bremanger Quarry in Norway. The unique mineralogy of the rock provides high thermal conductivity even in completely dry condition. The thermal backfill sand is produced at the Bontrup terminals Graniet Import Amsterdam and Antwerp Stone Terminal in Belgium. The specially developed grain size distribution ensures good compactability and dense packing, forming a stable bed around the cable and allowing it to retain moisture for a long time.
Extensively tested
The product has been extensively tested in laboratory trials. Because of the Bestone® homogeneity and the closely controlled manufacturing process, the product delivers consistent performance. This combination of properties makes Bestone® thermal backfill sand ideal for applications where reliable heat dissipation and moisture control are critical.
