Rosin Fluxes 640 Non-Activated

BOW ELECTRONIC SOLDER
TECHNICAL BULLETIN
BOW # 640
ROSIN FLUX (NON-ACTIVATED)

Description :

Bow #640 is a non-activated rosin flux, composed of pure water-white gum rosin and isopropyl alcohol. This flux meets all the requirements of Type R flux per MIL- F-14256D. It also meets J-STD - 004 Type ROLO.

Application :

BOW #640 can be used on all critical and sensitive electronic assemblies where flux residue removal is not feasible. These fluxes are recommended for use in tinning stranded wire, component leads and touch-up work for printed circuits. They can also be used as solderability test flux for quality control of incoming PC boards and component leads. BOW #640 can be applied by brushing, dipping or spraying. Should the fluxes become viscous due to solvent loss, simply thin down by adding isopropyl alcohol or BOW 1000T Thinner.

Residue Removal :

The flux residue is non-corrosive, non-conductive, and non-
hygroscopic, thus can be left on. If cleaning or removal of
the residue is necessary, it can be accomplished using
saponifier in an aqueous cleaning system.

Physical Properties :	#640
Color and Appearance	Amber Liquid
Solids Content (% by wt.)	40
Specific Gravity @ 20°C	0.880
Density (lbs./Gallon)	7.34
Flash Point (°F)	53
Water Extract Resistivity	200,000 ohm-cm

Storage :

Store in cool, dry place away from ignition sources.