TASK 70-18-00-330-801
1 . General.
CAUTION:
PRESSURE SENSITIVE TAPE ADHESIVE RESIDUES ON PARTS CAN CAUSE SURFACE ATTACK AT ROOM TEMPERATURE AND SEVERE PENETRATING ATTACK AT ELEVATED TEMPERATURE. WHEN TAPE HAS BEEN USED, MAKE SURE THAT ALL ADHESIVE RESIDUES HAVE BEEN COMPLETELY REMOVED FROM PARTS BEFORE SUBJECTING THEM TO ELEVATED TEMPERATURES SUCH AS THOSE ENCOUNTERED IN WELDING, BAKING, HEAT TREATING OR NORMAL ENGINE OPERATION.
A.Masking is used as a protection for areas of a part which must not be exposed to chemical or electrolytic processes. Masking is required for parts to be processed by electrolytic processes such as phosphating (granodizing), sulfuric anodizing, nickel plating, silver plating, cadmium plating, copper plating, chromium plating or chemical processes such as cleaning, stripping and painting.
B.This chapter provides the requirements relating to the application of the different forms of masking together with the various precautions and instructions required prior to starting any operation.
2 . Choice of Masking Method.
Subtask 70-18-00-330-001
A.The selection of a masking method depends on the nature of the process and the conditions of its application.
B.The masking used should be adequate to prevent chemical or electrolytic attack to the base metal. The masking should not peel off or be damaged by solutions and abrasive blasting operations.
C.Masking must always be applied to a surface free from contamination: grease, oil, dust, oxide, etc.