Lus piav qhia luv luv:

Dej-permeable Khiav khiav muaj dej zoo permeability, nruab nrab hardness thiab elasticity, ruaj khov lub cev muaj zog, thiab zoo heev applicability nyob rau hauv high humidity ib puag ncig, uas muaj txiaj ntsig zoo rau cov neeg ncaws pob 'ceev thiab thev naus laus zis, txhim kho lawv cov kev ua si kis las thiab txo tus nqi poob.Tus nqi ntawm qhov chaw no yog qhov qis tshaj plaws, thiab kev pabcuam lub neej feem ntau yog 5-6 xyoo.