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?
Lime is among the oldest and most vital materials used by humans. Most ancient languages have a word for calcium oxide. In Latin it is calx, from which the name of the element calcium is taken.