Graymont New Zealand sites manufacture thermally rated chip. This material has been tested to meet relevant standards as a high voltage cable bedding material.
Other specialised materials are available including stemming stone and selected fill.
Thermally Rated Chip
Did you know?
There are three distinct types of limestone, defined by their magnesium carbonate (MgCO3) concentrations. These types are Dolomitic (35 to 46% MgCO3), Magnesian (5 to 35% MgCO3) and High calcium (less than 5% MgCO3).