High quality Boron carbide sandblasting nozzle with PU Jacket 1) Length :from 135-175mm 2) Bore diameter :6/8/10mm 3) Thread :Fine thread or coarse thread 4)Alunimum jacket & PU jacket Production process 1.Boron carbide and other raw materials grind in ball crusher(72 hours) 2.die-filling 3.hot press molding(2500°C) 4.natural cooling 5.Mould unloading 6.end preparation 7.Shell processing and surface treatment 8.Assemble 9.Inspection and storage Technical data Hardness:HRA92-94 Density:4.50-4.60g/cm3 Bending strength:40kg/cm3 Compression strength:240kg/cm3   Appearance: carbon steel shell after sand blasting and plating, aluminum shell after sand blasting.