TASK 70-00-99-801-050
1 . Composition.
 
Consumable Product
Ref No.
Concentration (Initial Mix)
 
Abrasive grit
C04-220  
30 oz/US gal (225 g/l)
 
Anti-solidifying agent (optional)
C04-109  
0.4 oz/US gal (3 g/l)
 
Wetting agent (optional)
C04-110  
0.19 fl oz/US gal (1.5 ml/l)
 
Anti-rust agent (optional)
or potassium dichromate (optional)
C04-111  C04-108  
0.8 oz/US gal (6 g/l)
0.4 oz/US gal (3 g/l)
2 . Preparation.
Subtask 70-00-99-809-191
WARNING:
CHROMIC SOLUTIONS ARE VERY ACTIVE AND CAUSE SERIOUS BURNS. AVOID CONTACT WITH SKIN, EYES, AND CLOTHING. IF CONTACT OCCURS, WASH IMMEDIATELY WITH AN ABUNDANT QUANTITY OF WATER. AVOID BREATHING THE VAPORS.
WARNING:
THE OPERATOR SHOULD WEAR A FACE SHIELD, GLOVES, PROTECTIVE CLOTHING, AND PROTECTIVE SHOES.
A.Fill the tank one-third full with water.
B.Add the abrasive grit product C04-220   while you stir the solution to mix them together.
C.Slowly add the optional anti-solidifying agent C04-109   while stirring.
D.Add the anti-rust agent C04-111   or the potassium dichromate C04-108   if required by the vapor blast equipment manufacturer. Carefully add the product while stirring the solution.
E.Slowly add the wetting agent C04-110  , if necessary.
F.Fill the tank with water to working level.
G.Stir the solution again to mix.
3 . Check.
Subtask 70-00-99-809-192
H.Blasting Machine Mixture Check.
(1)Test the concentration by sedimentation:
(a)Operate the machine for at least 15 minutes to make sure the abrasive material has mixed equally.
(b)Remove a 250 ml sample of the abrasive mixture as it leaves the gun with a graduated test tube.
(c)Let the abrasive material collect at the bottom of the test tube for 15 to 30 minutes.
(d)If the abrasive material does not collect at the bottom of the test tube in 30 minutes, and/or it is hard to see the separation line of the sedimentation and the liquid in 30 minutes, the solution is contaminated. Thus, replace the solution.
(e)The average concentration must be 10 to 40 percent by volume.
(f)Change the mixture as required if the concentration is not correct.
4 . Regeneration.
Subtask 70-00-99-809-193
I.Add more solution as required.