# Which plastic type is used inside dishwashers?

We have a drinking bottle made partly from polypropylene that wraps when washed in a dishwasher. We would like to change the plastic type so that it can withstand in dishwasher.

I know for a fact that my dishwasher at home has a lining inside made from polypropylene. After googling this I have found a few sources that suggest that dishwashers would use a filler material in the PP called "calcium carbonate".

I would like to hear from someone who actually with confidence can tell us:

What is the usual plastic type used inside dishwashers? How is this plastic different from "normal" PP? Will we be able to use the same mold for this kind of plastic as "normal" PP?

Along the polymer chain, there a methyl groups (marked as $\ce{CH3}$) occupying more volume than hydrogen atoms (marked by $\ce{H}$). It is imaginable that all of these methyl groups are attached on one side of the chain only (the upper picture), or consistently "once on one, the next time on the opposite side" (the lower picture). Not shown here, there may be a randomized distribution, too, where you can't predict on which side the next methyl group will be attached (not shown here) as an intermediate situation.