Preliminary Requirements

Safety Requirements

WARNING

IT IS THE RESPONSIBILITY OF THE OPERATOR TO OBTAIN AND OBSERVE THE MANUFACTURERS MATERIAL SAFETY DATA SHEETS FOR CONSUMABLE MATERIALS INFORMATION SUCH AS, HAZARDOUS INGREDIENTS, PHYICAL/CHEMICAL CHARACTERISTICS, FIRE, EXPLOSION, REACTIVITY, HEALTH HAZARD DATA, PRECAUTIONS FOR SAFE HANDLING, USE AND CONTROL MEASURES AND ALSO TO TAKE LOCAL REGULATIONS INTO CONSIDERATION.

WARNING

SODIUM HYDROXIDE PRECAUTIONS

THE OPERATORS MUST ALWAYS WEAR THE PROTECTIVE CLOTHING SUPPLIED, WHICH INCLUDES RUBBER GLOVES AND EYE PROTECTION.

IF SODIUM HYDROXIDE SOLUTION GETS INTO THE EYES FULLY FLUSH THEM, WITH CLEAN WATER, THEN GET MEDICAL TREATMENT IMMEDIATELY.

A SUPPLY OF BUFFERED PHOSPHATE SOLUTION MUST ALWAYS BE EASILY AVAILABLE, TO APPLY TO BURNS.

CARE MUST BE TAKEN WHEN YOU ADD COMPOUNDS WHICH CONTAIN SOLID SODIUM HYDROXIDE TO WATER, BECAUSE HEAT IS GIVEN OUT WHEN THE COMPOUND DISSOLVES. MAKE MUCH MOVEMENT OF THE SOLUTION, WITH AIR OR MECHANICAL METHODS, AS YOU ADD THE COMPOUND TO THE SURFACE OF THE SOLUTION. DO NOT ADD LARGE QUANTITIES OF THE COMPOUND, TO ONE SMALL AREA OF THE TANK, BECAUSE THE SOLUTION WILL BOIL.

THE INSTRUCTIONS GIVEN BY THE SAFETY OFFICER MUST ALWAYS BE OBEYED.

Procedure

1. SUBTASK 70-33-87-200-001 Analysis of the Etching Solution

   1. Analyze the solution.

      1. The etching solution (refer to SUBTASK 70-33-87-100-001) must be analyzed frequently, twice daily when in continuous use, to make sure that the acid content is kept within the required range.

      2. The solution absorbs moisture from the atmosphere. Therefore, if it has not been in recent use, it must be analyzed, with its strength corrected, before the parts are etched.

         1. Use a pipet to transfer a 20 ml solution sample, into a standard 200 ml flask.

         2. Dilute to the mark, with CoMat 01-201 DISTILLED, DEIONIZED, DEMINERALIZED, OR REVERSE OSMOSIS (RO) WATER, then shake well.

         3. Use the pipet to transfer 20 ml of the diluted solution into a beaker.

         4. NOTE

            To calculate the amount of addition required, multiply the g/l low by the capacity of the tank (that is, in imperial gallons). Divide the result by 1803.2 to give the number of imperial gallons of sulfuric acid (SG 1.84) required.

            Add a few drops of CoMat 01-064 INDICATOR then titrate, with an N. solution of CoMat 01-008 SODIUM HYDROXIDE NaOH (CAUSTIC SODA), SOLID to a yellow end-point. The following will then apply:

            1 ml of N. sodium hydroxide = 0.049 g of sulfuric acid.

            Therefore, ml of N. sodium hydroxide x 0.049 x 500 = g/l of sulfuric acid.