Electronics > Projects, Designs, and Technical Stuff

Flyback Transformer, Cracked Epoxy Repair

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wraper:

--- Quote from: JDW on March 11, 2020, 11:46:36 pm ---This fly back was manufactured around 1990 and the epoxy has become brown over time due to the arcing. Therefore, it does not appear that this solid rock of epoxy would in any way become softer if I heated it.

--- End quote ---
It's not epoxy and generally such sort of adhesive becomes soft when heated. And it became brown not due to arching but simply due to age and heat. Now you are simply inventing conclusion out of nothing.

Ian.M:
*DON'T* attempt to cure epoxy in any oven that will ever be used for food.   

You can improvise a low temperature curing or drying oven with a box and a variable temperature heatgun set really low, though some sort of temperature probe to check you aren't over-cooking the work is very much needed, and its hard on the heat gun to run it for an extended period.  Remember, the heat gun motor needs room temperature airflow for cooling so don't make the box airtight or put the heatgun inside the box.

JDW:

--- Quote from: wraper on March 12, 2020, 01:20:08 am ---
--- Quote from: JDW on March 11, 2020, 11:46:36 pm ---This fly back was manufactured around 1990 and the epoxy has become brown over time due to the arcing. Therefore, it does not appear that this solid rock of epoxy would in any way become softer if I heated it.

--- End quote ---
It's not epoxy...

--- End quote ---

Talk about "inventing"!  How do you know for certain it is not "epoxy" (as it is clearly described in Larry Pina's excellent Macintosh Repair & Upgrade Secrets)?  If it is not epoxy, why are we (at least, Ian and I) talking about an epoxy fix?

wraper:

--- Quote from: JDW on March 12, 2020, 01:38:08 am ---Talk about "inventing"!  How do you know for certain it is not "epoxy"?  And if not epoxy, why are we (at least, Ian and I) talking about an epoxy fix?

--- End quote ---
Have you ever seen how epoxy looks like? Or even know what epoxy is? It certainly does not look like anything that have signs of drying.

Ian.M:
Why epoxy fix?  Epoxy is merely the most commonly available two part resin that (if the right grade is used) will have decent electrical insulation properties, will bond strongly to existing surfaces, is forgiving enough for a DIYer to work with and that has low enough toxicity components that inadvertent skin contact is unlikely to cause significant health issues unless you have already been sensitised by previous occupational exposure, (usually repeated prolonged and excessive skin contact or by breathing significant quantities of dust from sanding 'green' cured epoxy).  There are other types of two part resin not in the general family of epoxy and modified epoxy chemistries, and various catalysed monomer resins, but they typically either are extremely nasty health hazards, or have poor adhesion or poor mechanical or electrical properties.

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