... 2.Certifition:ISO9001,ISO14001 3.Material:wood and metal 4.Features:anti-acid,anti corrosion 1.The operation board surface:height is ... the additional enlargement,so it is resistant to the strong acid,alkali,frictions,fire,corruption,heat,high temperatures and scratches etc ... specially for experiments,which is flexible and resistant of the acid,alkali and the organic impregnant;3.Switch:in high quality ...