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Delta 691 no-clean solder paste is reportedly formulated to provide excellent tack force, a tack time greater than 48 hours, 24-hour stencil life, 72-hour open time and prints up to 8" per second. Post-soldering residues are clear and pin testable. It has a nine-month refrigerated shelf life and can be used in an air or nitrogen reflow environment.
Qualitek International Inc.