In the manufacture of our cups and plates, Dart uses a lubricant in the extrusion process of our polystyrene resin pellets which contains zinc stearate. Zinc stearate (C₃₆ H₇₀ O₄ Zn) is ultimately derived from tallow (animal fat). Because of the high temperature and purification steps, the tallow is, in effect, denatured (removed from the class of being "food"). Some religious authorities accept this idea and consider zinc stearate just another processing chemical.

Other religious authorities do not accept this argument of denaturing and further take the position that the presence of even small amounts of tallow-derived processing aids causes contained foods to lose Kosher/Halal status.

Since Dart does utilize these processing aids and given the current differences in theological opinion, we suggest that guidance is sought from your religious leader.