I need to find the hardest PC out of all the brands. I want to form
the clay around a long threaded rod, which will turn inside it. I
expect the clay to wear down after a while (even though it will be
lubricated), but would like to delay that for as long as possible.
Can someone tell me which brand would be the most suitable?
Antispamming invoked to protect the innocent.
XXX = com