(2)
Maintain solution at 160 to 200F (71 to 93C) in an air agitated tank.
F. Method No. 202F: Magnesium Touch-up Mixing Instructions
WARNING: USE EXTREME CAUTION TO PREVENT CONTACT WITH SKIN. IF POWDER OR MIXED SOLUTION COMES IN CONTACT WITH SKIN, FLUSH OFF IMMEDIATELY WITH WATER. DO NOT INHALE DUST FROM POWDERS OR VAPORS FROM THE SOLUTION.
Prepare magnesium touch-up solution as follows:
WARNING: USE CORRECT PERSONAL PROTECTION. THIS CHEMICAL SOLUTION CAN CAUSE SKIN, EYE AND LUNG DAMAGE. THE DANGER AND PRECAUTIONS FOR EACH CHEMICAL IS DIFFERENT.
(1)
Add 1.3 ounces (38,44 ml) of chromic acid flake (SECTION VII) to slightly less than one gallon of distilled or de-ionized water, mix until completely dissolved.
(2)
Add one ounce of calcium sulfate (SECTION VII).
(3)
Stir vigorously for at least 15 minutes to ensure saturation of the solution with calcium sulfate.
Cleaning
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G. Method No. 202G: Electrocleaner Mixing Instructions
WARNING: USE CORRECT PERSONAL PROTECTION. ELECTROCLEANER SOLUTIONS ARE HAZARDOUS. AVOID INHALING FUMES, DUST, OR MIST. AVOID CONTACT WITH SKIN. AFTER PREPARATION, WASH HANDS AND FACE THOROUGHLY.
Prepare electrocleaner solution as follows:
(1)
Combine nine ounces of electrocleaner (Wyandotte FS) (SECTION VII) to each gallon (3,78 L) of distilled or de-ionized water.
(2)
Maintain solution at 160 to 200F (72 to 93C).
H. Method No. 202H: Sodium Hydroxide Mixing Instructions.
WARNING: USE THE CORRECT PERSONAL PROTECTION. THIS CHEMICAL SOLUTION CAN CAUSE SKIN, EYE AND LUNG DAMAGE. THE DANGER AND PRECAUTIONS FOR EACH CHEMICAL IS DIFFERENT.
(1) Mix sodium hydroxide 20 percent by weight with water and maintain at room temperature.
3. Standard Cleaning Methods
CAUTION: SPECIFIED CLEANING METHODS OUTLINED MUST BE FOLLOWED. THE VARIOUS SOLUTIONS AND MATERIALS SPECIFIED IN THE CLEANING METHODS CAN BE USED ONLY ON THE PARTS AND MATERIALS INDICATED. FAILURE TO USE THE PROPER CLEANING METHOD MAY RESULT IN IRREPARABLE DAMAGE TO THE PART BEING CLEANED. REFER TO APPLICABLE MANUAL FOR UNIT IN WORK FOR SPECIFIC MATERIAL AND INSTRUCTIONS.
A. Method No. 203A: Using Petroleum Solvent
Degrease parts using petroleum solvent as follows:
WARNING: SOLVENT VAPORS ARE TOXIC AND FLAMMABLE. DO NOT INHALE VAPORS. OBSERVE FIRE PRECAUTIONS.
(1)
Place solvent (Federal Specification P-D-680, Type I) (SECTION VII) in dip tank or use as a spray in a positive outside-ventilated spray booth.
(2)
Dip, soak, agitate or spray parts to be cleaned until oil and grease have been removed.
(3)
Remove caked grease or soft carbon deposits using stiff plastic fiber bristled brush.
WARNING: USE CORRECT PERSONAL PROTECTION. COMPRESSED AIR WILL CAUSE LOOSE PARTICLES THAT CAN GET IN YOUR EYES. COMPRESSED AIRFLOW CAN CAUSE CUTS, DO NOT POINT IT AT YOUR SKIN.
(4)
Air dry parts with low-pressure compressed air (20 psig (137,895 kPa) maximum).
Cleaning
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B. Method No. 203B: Using Vapor Degreasing
NOTE: Aqueous degreasing per Method No. 203V is an acceptable alternate for vapor degreasing.
Degrease parts using vapor-degreasing method as follows:
WARNING: AQUEOUS CLEANER/DEGREASING SOLUTION IS A MILD IRRITANT. AVOID DIRECT EYE CONTACT OR EYE IRRITATION AND REDNESS MAY OCCUR. SAFETY EYEWEAR IS RECOMMENDED. DIRECT SKIN CONTACT CAN CAUSE SKIN IRRITATION. WEARING PROTECTIVE GLOVES IS RECOMMENDED. AVOID INHALING SPRAY MIST VAPORS, MAY CAUSE IRRITATION.
(1)
Use 1,1,1-trichloroethane (in accordance with MIL-T-81533), trichlorotrifluoroethane (in accordance with MIL-C-81302), trichloroethylene (in accordance with ASTM D 4080), n-propyl bromide or perchloroethylene (in accordance with ASTM D4376) in vapor degreaser at a temperature range in accordance with manufacturer’s recommendations.
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