When exposed to extreme heat, plastics will begin to melt. For most plastics, the temperature only needs to reach around 212 degrees Fahrenheit to begin showing signs of deterioration. Most house fires will burn at a temperature of 1,100 degrees Fahrenheit, leaving all plastic material in the area left looking like the Wicked Witch Of The West. So for those precious family photos hanging on the wall wrapped in a cheap plastic frame, you may want to consider switching to something a little more heat resistant.