Cure Time and Intensity
One Joule
of energy = 1,000 milliWatt seconds = 1,000,000 microWatt seconds
The formula you use to find out how many seconds
you need to cure the adhesive is listed below.
Time for Cure x UV intensity at adhesive = Light
Energy needed to cure converts to:
Time for Cure = (Light Energy needed to cure) divided
by (UV Intensity at adhesive)
This calculation is for adhesive thicknesses from
1 to 10 mils.
EXAMPLE:
Calculating the time needed to cure the NEA 123 using
a light source that generates an intensity of 6,000
microWatts/sq. cm at adhesive.
1: To fully cure the NOA 123 you need 4.5 Joules/sq. cm of light
energy.
a: Time = (4.5 Joules/sq. cm) divided by (6,000 microWatts/sq.
cm)
b: 4.5 Joules/sq.
cm = 4,500,000 microWatt seconds/sq. cm
c: Time = (4,500,000 microWatt seconds/sq. cm) divided by (6,000
microWatts/sq. cm)
Answer: Time for
cure = 750 seconds = 12 minutes, 30 seconds
