Styrofoam dissolves in acetone, it doesn't actually melt - melting requires heat. 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. In other words, the cutting edge will reach a higher temperature in the air than when it is cutting styrofoam, as the foam will absorb the heat. 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. 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? The acetone (formula (CH3)2CO) breaks the bonds that hold the polystyrene together. As Styrofoam is made from plastic, the hot glue gun can actually cause it to melt, potentially damaging your designs. Also, when melting or otherwise exposed to heat, styrofoam can release carbon monoxide which is potentially toxic. Make sure the glue gun has a low-heat setting because high heat will melt the foam. Melting styrofoam can become liquidy and get onto the skin, causing burns or irritation. 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). Styrofoam is made mostly of air, meaning it is a poor conductor of heat, but an excellent convector. It traps the air in small pockets, blocking the flow of heat energy. Styrofoam is made of polystyrene beads. The biggest concern when using styrofoam is to always be aware if it is melting. 'Styrofoam' is actually a polymer of styrene (vinyl benzene --- C6H5-CH=CH2). During normal use Styrofoam remains stable, but once it has been exposed to high temperatures the material begins to melt and break down, those toxic chemicals contained within can leech into your food. 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). In the following, you’ll learn which glue to use on Styrofoam, the difference between Styrofoam and polystyrene, and what exactly EPS and XPS foams are. On the other hand, conductors such as metal are poor insulators because energy flows through them. Therefore, reusing it is a great way to be eco-friendly and sustainable. Hot glue guns should only be used to attach materials which are not affected by heat. High heat or prolonged exposure to heat can make the Styrofoam to melt or break. 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