Schedule AUTHORISED FUEL
Thermac briquettes manufactured by Thermac Fuels Ltd at Shildon, County Durham which —
(a)
comprise anthracite (as to approximately 90% total weight) and self-setting organic binder (as to the remaining weight) converted into briquettes by roll pressing at ambient temperature;
(b)
are unmarked pillow-shaped briquettes with an average weight of 48 grams and a bulk density of 700 kilograms per cubic metre; and
(c)
have a sulphur content not exceeding 1.5% total weight.