34 Pa. Code § 35.33 – Packages over l00 pounds in weight.

The following shall be carried on by means of an approved type of enclosed packing machine:

(1) All packing of lead carbonate, basic lead sulphate, lead oxides, lead chromate, or other lead compounds where the mixture contains more than 10% of such lead compounds in packages over 100 pounds in weight.
(2) All packing of any dry substance containing arsenic in packages over 100 pounds in weight.

This section cited in 34 Pa. Code § 35.31 (relating to applicability).