Regulation 38
(1)
Weights shall be made entirely of metal, other than lead or other soft metal or soft alloy:
Provided that lead may be inserted into a weight for the purposes of adjustment.
(2)
No weight of a purported value of less than 4 ounces in the imperial system, or less than 100 grammes in the metric system, shall be made of iron.
(3)
Avoirdupois weights shall not be made of aluminium or of any other metal or alloy of low density.
(4)
Subject to regulation 44(1), no weight shall be made of two or more different and unalloyed metals.