... to be oxidized 4.non-expolosion 5.non-cleavag Protective sleeve and inner liner used for ... 20mm, Φ25mm, Φ32mm, Φ38mm, Φ42mm, Φ50mm, Φ100mm and other dimensions protective sleeve of the crystallizing dish for various ... ), not easy to be oxidized, non-expolosion, non-cleavage, and can be used repeatly.It is ... but also the defect of being preheated and explode easily.Using methodWhen the protective sleeve ...