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Why does the tees need to do the blasting before painting?

Why does the tees need to do the blasting before painting?
Update Time:2019-09-25

Why does the tee need to do the blasting before painting?

Sandblasting Equipment
tees after painting
Before painting, pipe tees must do the blasting. The blasting process adopt compressed air to form a high speed jet beam, spraying the material on the surface of the tees, make the appearance of tees changes. Due to the impact and cutting from spraying material, the surface of tees will gain some cleanness and different roughness, improving the mechanical properties of tee surface.

The quality of blasting will affect the adhesion and appearance of the coating, the moisture resistance and corrosion resistance of the coating. If the blasting not done well, the rust will continue spread under coating, causing the coating falling off. After carefully cleaning the surface, the coating life will be 4-5 times longer than that only simple cleaning.
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