34 Pa. Code § 11.43
Employment of minors under 18 years of age in establishments where black powder of any variety, dry gun-cotton, nitroglycerine, dynamite, chlorates, fulminates, picric acid, fireworks, any other substances which are subject to expansion by the aid of shock, friction, spark or heat are manufactured, handled or stored is prohibited. Smokeless powder, wet gun-cotton and wet nitro-starch, while not properly classed as explosives are also included. This, however, does not prohibit the employment of minors, male or female, between the ages of 16 and 18, in any establishment where such explosives are handled or stored. The minimum distance any minor may be so employed shall be 360 feet from the point of handling or storage of the explosives and maximum quantity of explosives for this distance shall be 200 pounds. Increase in the quantity of explosives handled or stored, where minors are so employed, shall increase the distance. The quantity and distance table of § 5.122 (relating to tables of quantity and distance) shall govern the distance.
34 Pa. Code § 11.43