This standard BS 3958-1:1982 Thermal insulating materials is classified in these ICS categories:
91.100.60 Thermal and sound insulating materials
This Part of this British Standard specifies composition, moisture content, physical and chemical requirements for magnesia preformed insulation slabs, lags and pipe sections, generally for use up to about 315 °C.
Deals with properties and dimensions of preformed slabs, lags and pipe sections for use up to about 315°C.