Potting Process
1) Pre heat resin to 120℉.
2) Mix resin / hardener at a volume ratio of 100:12.
3) Apply a 4 mm thick epoxy floor to bottom of can.(No Vacuum required)
4) Allow to harden. Approximately 24 hour.
5) Assemble Transformer into Can.
6) Place Can into vacuum chamber.
7) Pull a 10 to 40 torr vacuum for 5 minutes.
8) Fill can till transformer is covered with epoxy.(Under vacuum)
9) Total vacuum time is 20 minutes.
10) Apply 60 PSI for 6 minutes.
11) Remove part from vacuum and fill can to top and apply cover.
12) Allow to cure for 24 hour .
13) Over cure for 6 hours at 60 ℃.(Actual times mat vary as process is developed with new equipment)
Some facts
Total epoxy is approximately 9 lbs per unit(4100 grams)
This equayes to 150 cubic inches of epoxy.(2460 cu cm)
Epoxy flow rate of 123 cu cm per minute = 1 part in 20 minutes.
200 cu cm / minute is a better rate. |