De hurdens fan glês is heul heech, as it gebrûk net maklik is om te krassen en te krassen, is de algemiene natriumkalciumglês vickers hurdens (HV) 400 ~ 480MPa, en de hurdens fan plestik binne relatyf leech, maklik te krassen, lykas polyvinylchloride (PVC) HV is 10 ~ 15MPa, thermoset polyester (PET) ...
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