... be oxidized 4.non-expolosion 5.non-cleavag Protective sleeve and inner liner used for oxygen-free copper producing facilityIt is ... 14.4mm, Φ17mm, Φ20mm, Φ25mm, Φ32mm, Φ38mm, Φ42mm, Φ50mm, Φ100mm and other dimensions protective sleeve of the crystallizing dish for various ... also difficult to damage the protective sleeve. Protective sleeve and inner liner usde for oxygen-free copper producing facility