PC Flex Mask
Q: How long does it take to cure PC Flex Mask?
A: Since PC Flex Mask is a water-based product, we are talking about removing the water from PC Flex Mask. This means the cure time depends on the surrounding temperature, relative humidity, and mask thickness. With a ten mil thickness at 72°F and a relative humidity of 40%, it would take about 40 minutes to cure.
Q: Can the time to cure PC Flex Mask be decreased?
A: Yes, the curing time can be reduced with warm, dry, moving air. In a convection oven at 150°F where all of these conditions exist, you can reduce the drying time by 50%. If an oven is not available, introducing a simple fan to keep the air moving over the PC Flex Mask will decrease the cure time by about 30%.
Q: Can PC Flex Mask be cured even faster at a higher temperature?
A: We have found with many years of trial and error that PC Flex Mask will boil in the oven if heated beyond 150°F. Our recommendation is to keep the oven at a maximum of 150°F.
Q: How can you tell if PC Flex Mask is cured?
A: The curing process changes the color of PC Flex Mask from a dark color to a lighter color. When you see the change to a light color, the PC Flex Mask is cured.
Q: After curing, how high of a temperature can PC Flex Mask withstand?
A: PC Flex Mask was designed to withstand molten solder during the wave solder operation for about five to seven seconds. The temperature of molten solder during is 450° to 515°F. For longer periods, PC Flex Mask will resist a temperature of 220°F for three hours.
Q: Can PC Flex Mask be used over bare copper and other sensitive metals?
A: Yes. We do make a Non-Ammoniated PC Flex Mask that is designed to be applied over copper and other sensitive metal surfaces. Our Regular PC Flex Mask is not formulated to be applied over copper.
Q: Does PC Flex Mask have any reaction to low temperatures?
A: In an uncured (wet) state, PC Flex Mask should not be exposed to freezing conditions. If PC Flex Mask becomes frozen in storage or transit, it will coagulate and become unusable. In a properly cured and dried state, PC Flex Mask will not be affected by low temperatures.
Q: Is PC Flex Mask Hazardous?
A: No, PC Flex Mask is not hazardous. It does contain up to two-tenths of one percent of ammonia, but this does not classify it as hazardous.