• Excellent masking protection
• Available in tape and die-cut discs
• Easy removal in standard aqueous cleaning systems
• Operates in low pressure washing systems
• Environmentally safe
• Replaces INT 768

Description
INT 769 is a masking tape for the protection of printed circuit boards during soldering. It consists of a water soluble adhesive and supporting base which enables easy removal from printed circuit boards by normal aqueous defluxing.

Application
Avoid air entrapment and stretching of film when placing on the pcb. Once the tape has been applied, it should be pre-heated for 1-2 minutes at 100-150°C to remove any absorbed moisture before soldering. Normal pre-heating during the wavesoldering process is adequate.

Removal
Washing time is dependent on a number of factors: the type of system, type and quantity of jets, water temperature and pressure. A temperature of at least 60-65°C is recommended to ensure complete dissolution of the tape. INT 769 is suitable for low water pressure systems. Optimum factors must be evaluated in each individual case. It is recommended that a saponifier or detergent be used where possible.

Specifications
Supporting base	Water soluble film
Base thickness	0.045 +/- 0.005 mm
Total thickness	0.060 +/- 0.008 mm
Colour	Translucent
Interliner	Siliconised paper
Adhesive strength	1 N/cm

See also! INT 701 Kapton Masking Tape & Dots TEC 2211 Wondermask P Temporary Solder Mask