What temperature should the heat gun be to remove back glass?

adam  I don’t think that is is an exact temperature issue but a consistent temperature across the whole back. Your blow dryer may not supply enough heat over the whole back panel. Check this guide Samsung Galaxy S7 Rear Glass Replacement and consider step 2 “If you have trouble, apply more heat to further soften the adhesive, and try again. The adhesive cools very fast, so you may need to heat it repeatedly. “

"Refer to this guide on how to do a back glass replacement on the S7:

Samsung Galaxy S7 Rear Glass Replacement

I use guitar picks, suction cup to lift up a corner of glass a bit after heating the adhesive then go around the adhesive with the guitar pick to lift the glass up safely.

I think the key is to get the guitar pick under the whole adhesive if possible as it gives the best result when prying the back glass off."

I found an easy way: use an electric iron. The one for clothes I mean. It has to be an adjustable one, to the low setting. NOT a steam iron. Works like a charm.

Hi Adam! Surely a hair dryer can do the job, altough a heat gun would be recommended, The phone Needs arround 80-100c, You can adjust a heat gun to 1 if you want to maintain a great temperature, Good Repairs!

I’ve read that it should be hot enough to the touch that you can’t leave your finger on the heated area. I would apply even heat and test frequently until the temperature becomes too hot to touch. That way you lessen the chance of over-heating and damaging the components. I hope that helps.

225 degree Celcius is critical failure for microchips. It's extremely unlikely you'll damage it with a blow dryer at any point. If we still had LCD displays it would be a concern but it's now oled displays so it's pretty safe to just blast.