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