Kev tsim kho yog feem ntau raws li hauv qab no: Cov roj hmab hauv ob sab hauv yog cov ntaub ntawv pov thawj thiab ua los ntawm hluavtaws lossis roj hmab ntuj, nyob ntawm daim ntawv thov. Qhov no tseem siv tau rau sab nraud rubbercover, uas muaj cov haujlwm tseem ceeb los tiv thaiv cov canvass, nruab nrab ntawm lub hau thiab sab hauv hauv ob sab phlu, los ntawm kev puas tsuaj sab nraud. Cov polymers tshwj xeeb tuaj yeem muab tau los tiv thaiv cov tshuaj, roj, hnub ci, acidfumes thiab ozone. Lub siab txhawb nqa canvassconsists ntawm ntaub thiab hlau reinforcement, raws li wireor khoom rings.
