Cov yam ntxwv ntawm polyurethane khoom:

1. Tsis muaj khawb lossis suab nrov. Lub neej ua haujlwm ntev thiab txo cov nqi.
2. Qhov ntsuas kub tsis kam yog los ntawm -20 degree C txog 120 degree C.
3. Cov khoom siv polyurethane tsis muaj kuab paug, tsis muaj tshuaj lom, thiab tsis muaj ntxhiab tsw.