CHART I

Handy Flux as a Temperature Indicator

Temperature

 

°F/°C

Appearance of Flux

212/100

Water boils off

600/316

Flux becomes white and slightly puffy, and starts

 

to "work"

800/427

Flux lies against surface and has a milky appearance

1100/593

Flux is completely clear and active, looks like water.

 

Bright metal surface is visible underneath. At this

 

point, touch the solder to the joint area. If it melts, the

 

assembly is at the proper temperature for soldering.