Pob zeb hauv ob sab phlu board domestic maj mam hloov los ntawm alloy steel phaj nyob rau hauv siab manganese hlau, tab sis raws li cov hlau phaj nyob rau hauv daim ntawv thov tas mus li ntawm pob zeb liner, tau maj hloov cov manganese hlau thiab lwm yam hauv ob sab phlu board los ua lub mainstream kev lag luam.
Lub tog raj kheej liner ntxiv rau kev tiv thaiv lub cev, kuj tseem muaj kev cuam tshuam rau kev txav ntawm kev sib tsoo nruab nrab, txhawm rau hloov mus rau kev ua haujlwm sib txawv (sib tsoo thiab sib tsoo zoo), cov duab.