MIL-STD-1504C
Magnesium Alloys 6.9 x 104 to 2.8 x 108
(10 to 40 psi)
Titanium Alloys 2.8 x 108 to 4.2 x 108
(40 to 60 psi)
5.7 Silicon and aluminum oxide blasting.
WARNING
Avoid excessive inhalation of abrasive dust. Provide ventilation as required. (See: OSHA CRS 1910)
a. The nozzle should be held at an angle close to perpendicular with the surface being cleaned.
surface.
b. The nozzle shall be held at 8 to 31cm (3 to 12 inches) from the
c. The air pressure should not exceed 6.2 x 108Pa (90psi).
5.8 Plastic media blasting. Plastic media blasting is a good system for organic coating removal from metal surfaces.
WARNING
Plastic media blasting should not be used on fiberglass or other composite materials or on metals having a thickness of less than 0.064 inches without the authorization of the responsible engineering authority.
WARNING
Consult with equipment and media manufacturers on operational safety requirements as an example: Titanium and steel alloys will spark when blasted with plastic media.
a. Use media conforming to the requirements of MIL-P-85891. Media should have a particule size of US screen 20 to 40 mesh. Media having a high density particle contamination level greater than 0.02 percent by weight should not be used.
b. The nozzle should be held at an angle close to perpendicular with the surface being cleaned.
c. The blast nozzle should be held at 31cm to 62cm (12 to 24 inches) for media having Barcol hardness of 34 to 42 and 56 to 77cm (18 to 30 inches) for media having Barcol hardness of 54 to 72cm.
d. Pressure should be between 2.8 x 108 to 4.2 x 108 (40 to 60 psi) at the blast nozzle for media having a Barcol hardness of 34 to 42 and less than 4.2 x 108 (40 psi) at the nozzle for media having a Barcol hardness of 54 to 72cm.
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