Sab hauv ntawm lub qhov rooj nplooj ntawm lub qhov rooj hluav taws steel yog muaj ib hom tshiab ntawm ib puag ncig tus phooj ywg nplaim taws retardant thiab rwb thaiv tsev kub, uas yog non-toxic thiab harmless rau tib neeg lub cev. Nws yog lub qhov rooj hluav taws kub steel nrog qee qhov hluav taws kub tsis kam ua los ntawm cov khoom siv hluav taws kub tsis zoo.

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