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To prevent scratching or chipping, especially when your cast iron pieces are nesting within each other, use cloth or paper towels to create a buffer. Place these in between multiple pieces to prevent them from clanging together during transit.
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HPMC, on the other hand, is Hydroxypropyl Methylcellulose. It is produced by alkali treatment of refined cotton and further etherified using epichlorohydrin and chloromethane as etherifying agents, resulting in a nonionic mixed ether of cellulose. The degree of substitution is typically between 1.2 and 2.0, and its properties vary based on the ratio of methoxy and hydroxypropoxy groups.


