Absorption Tube devised for the determination of the content of harmful substances in the air.Mainly collect gaseous,vapor species, aerosol mist and a variety of toxic and harmful gases in the air,collection efficiency is more than 97%. ● Material:Borosilicate Glass ● Color:White/Brown ● White absorption bottle (tube) is made of high quality boron glass,high mechanical strength,resistance to high temperature,high pressure,also can be used repeatedly ● Brown absorption bottle (tube) is made of brown glass which shading performance good,when ordinary light state,without having to light shielding