On the other hand, conductors such as metal are poor insulators because energy flows through them. This is the sort of question that I'd usually answer with a link to LMGTFY, but in this case you get a pass, because you need to know what styrofoam is before you can get a good answer out of google. As Styrofoam is made from plastic, the hot glue gun can actually cause it to melt, potentially damaging your designs. Polystyrene foam is much more heat-sensitive than polyurethane foam .. it softens already at 90°C (193°F), while the temperature of hot-melt glue is around 180°C or more. Styrofoam is made of polystyrene beads. Therefore, reusing it is a great way to be eco-friendly and sustainable. You can also use liquid Elmer’s glue and Liquid Nails as alternatives. Styrofoam (Polystyrene) is very bad for the environment, and yet it can’t be recycled in most places (including a large part of the US). Melting styrofoam can become liquidy and get onto the skin, causing burns or irritation. 'Styrofoam' is actually a polymer of styrene (vinyl benzene --- C6H5-CH=CH2). So, the correct question is: Why does acetone dissolve styrofoam? If this happens in the case of the first Styrofoam that we just talked about, you are likely to end up with the broken or melting Styrofoam. Traditional Styrofoam. Hot glue guns should only be used to attach materials which are not affected by heat. While the food-grade Styrofoam has been designed to work with microwaves, it is not much able to withstand heat. The melting point (for lack of a better phrase) of polystyrene appears to be quite high, higher than most heat lamps would get, is this a legitimate concern? 2) I've seen numerous reports online of a heat lamp or a heat pad causing the nice styrofoam backgrounds to melt, but no pictures or substance. High heat or prolonged exposure to heat can make the Styrofoam to melt or break. Also, when melting or otherwise exposed to heat, styrofoam can release carbon monoxide which is potentially toxic. It traps the air in small pockets, blocking the flow of heat energy. Make sure the glue gun has a low-heat setting because high heat will melt the foam. Styrofoam is made mostly of air, meaning it is a poor conductor of heat, but an excellent convector. Styrofoam dissolves in acetone, it doesn't actually melt - melting requires heat. But, how the heck can you reuse styrofoam into useful things that you … The acetone (formula (CH3)2CO) breaks the bonds that hold the polystyrene together. Remember that polystyrene is made up of many smaller molecules called monostyrene. The DOW is trying to eliminate the use of styrene as it is because it smells so bad and is very toxic hence the company is trying to resort to co-polymerization (adding other monomers along with styrene in the polymerization process). 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