<Li> A siphon blast system (suction blast system) uses the compressed air to create vacuum in a chamber (known as the blast gun). The negative pressure pulls abrasive into the blast gun where the compressed air directs the abrasive through a blast nozzle . The abrasive mixture travels through a nozzle that directs the particles toward the surface or workpiece . </Li> <P> Nozzles come in a variety of shapes, sizes, and materials . Tungsten carbide is the liner material most often used for mineral abrasives . Silicon carbide and boron carbide nozzles are more wear resistant and are often used with harder abrasives such as aluminum oxide . Inexpensive abrasive blasting systems and smaller cabinets use ceramic nozzles . </P> <Ul> <Li> In a pressure blast system, the abrasive is stored in the pressure vessel then sealed . The vessel is pressurized to the same pressure as the blast hose attached to the bottom of the pressure vessel . The abrasive is metered into the blast hose and conveyed by the compressed gas through the blast nozzle . </Li> <Li> Wet blast cabinets use a system that injects the abrasive / liquid slurry into a compressed gas stream . Wet blasting is typically used when the heat produced by friction in dry blasting would damage the part . </Li> </Ul> <Li> In a pressure blast system, the abrasive is stored in the pressure vessel then sealed . The vessel is pressurized to the same pressure as the blast hose attached to the bottom of the pressure vessel . The abrasive is metered into the blast hose and conveyed by the compressed gas through the blast nozzle . </Li>

What type of sand is used in sandblasting