Stabilised Sand is a controlled blend of sand, cement, and water designed to create a firm, semi-bound material that sits between loose sand and full concrete.
Thermal Sand
Screened Or Washed Sand Specified For High Thermal Resistivity And Conductivity. Thermal Sand is a specially processed, screened or washed sand designed for use around underground electrical cables, conduits, and utilities where controlled thermal performance is critical. It typically consists of fine to medium, rounded and evenly graded particles, with very low levels of impurities such as organics, stones, and oversized material.
Additional Information
Additional information
This engineered sand is selected and processed to achieve specific thermal resistivity and conductivity properties, helping manage heat dissipation from live cables and protecting them from thermal stress. Its consistent light tan to beige colour and uniform grain size reflect its high level of cleanliness and quality control compared to general-purpose sands or fills.
Key characteristics:
- Screened or washed for clean, uniform grading
- Fine-to-medium rounded grains with minimal impurities
- Engineered for high thermal resistivity and conductivity performance
- Ideal for specialist backfill around underground services
Usage
Thermal Sand is commonly specified by network operators, engineers, and contractors for critical underground installations where both protection and heat management are required:
Underground Power Cables
- Used as a bedding and surround material for LV, HV, and communications cables.
- Helps dissipate heat away from cables, supporting safe operating temperatures and cable longevity.
Electrical & Communication Conduits
- Placed around PVC, HDPE, and other conduits carrying electrical or data services.
- Provides a consistent, void-free envelope that protects conduits and assists with predictable thermal performance.
Substations & Cable Trenches
- Used in substation yards, joint bays, and cable trench systems, where engineered backfill is required.
- Supports compliance with design specifications and utility standards.
Specialist Backfill for Utilities
- Suitable where project documentation or standards specify a thermal backfill material rather than general sand or soil.
- Often used in conjunction with marker tapes, warning meshes, and protective covers as part of a complete underground service installation.
Application Tips:
- Install in layers and lightly compact to achieve a stable, uniform surround without over-compacting or segregating the material.
- Always follow the design engineer’s or utility provider’s specifications for depth of cover, thermal resistivity requirements, and installation methods.
- Keep the product clean and free from contamination on-site to maintain its specified thermal properties.
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