MIL-STD-1504C
d. Ventilation and personal protective equipment. Ventilation
and personal protective equipment requirements shall be in accordance with OSHA CRS
1910.
5. DETAILED REQUIREMENTS
5.1 Masking. Sections or areas of a part that are not to be abrasive blasted shall be masked off. Threaded holes and blind holes in parts shall be protected from abrasive deposits and physical damage by the insertion of appropriate bolts, plugs, or rubber stoppers.
5.2 Distortion and warpage. Blasted parts shall show no evidence of distortion or warpage. Use care in blast cleaning to avoid excessive local blasting. Use fine abrasive and low air pressure on thin or low strength sections.
5.3 Compressed air. The compressed air used for blowing off dust or drying parts for dry abrasive blasting shall be essentially free from moisture, oil and solid particles. The air shall be filtered at the point of use or be supplied by facilities designed to deliver clean air. Clean and replace the filters or maintain the equipment as
necessary to meet these requirements.
5.4 Process flow. (Typical)
a. Clean in accordance with paragraph 4.2. b. Mask as required, paragraph 5.1.
c. Clean by abrasive blasting. d. Clean with air as required.
e. Continue processing as soon as possible.
5.5 Glass bead blasting.
a. Precision cleaning requires spherical blast beads. Broken beads are abrasive and accelerated the removal of base metal during blast cleaning.
b. The nozzle should be held at an angle close to perpendicular with surface being cleaned.
c. The nozzle should be held 8 to 30 centimeters (cm) (3 to 12 inches)
from the surface.
d. The recommended air pressures are:
Ferrous Alloys 2.8 x 108 to 4.2 x 108 PA
(40 to 60 pound force per square inch (psi)
Aluminum Alloys 2.1 x 108 to 3.5 x 108 PA (30 to 50 psi)
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