Various f a c t o r s t h a t cause t h e r u s t i n g o f t a b l e t punches anddies by a hydrochloride s a l t were evaluated. r i c h i n n i c k e l content was found t o have t h e b e s t r e s i s t a n c e t o r u s t i n g by t h e hydrochloride s a l t . humidity, temperature and c o n t a c t time w i t h t h i s hydrochloride s a l t were a l s o found t o be responsible f o r r u s t i n g o f t o o l i n g Tooling m a t e r i a l Other f a c t o r s such as materi a1 . The hydrogen c h l o r i d e l i b e r a t e d from t h e s a l t was found t o A c o r r e l a t i o n between the be t h e cause of r u s t i n g o f t o o l i n g . s t a b i i i t y o f hydrochloride s a l t as determined by thermogravim e t r i c a n a l y s i s and i t s e f f e c t on r u s t i n g o f t o o l i n g m a t e r i a l was demonstrated. Optimization o f t o o l i n g composition d u r i n g p r e f o r m u l a t i o n i s recommended.
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