Common temperature for mobile phone glue melting

Hello, I have an old question which makes me curious... Which temperatures are for:

1) Separating phone screenes from frame
2) Removing phone back covers

I am spekaing mostly about chinease brands, Xiaomi, Meizu, Huawei etc. They has IPS and AMOLED screens and plastic covers.

In most of dissasembiling guides it shown as heating up to 80° in general... I suppose that B7000 has melting poing about 85° C.

Theoretically, putting your phone on Separator machine, set there 80° C and heat for a 3mins should be enough for cover and screen...
I saw that someone also used heating gun from soldering station, with 300° C during 2-3 mins.
 
I just use an ifixit iopener, which is just a microwavable gel heat pack. I don't think it gets near 85' as you can handle it without being burned, but it works well.

I've used it on Xiaomi, Sony, iphones etc.
 
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