How heat guns work
Temperature Range: 50ºC~350ºC
Power Input: AC 230V-50Hz
For removing old paint, defrosting pipes and shaping plastic
Heat guns look a lot like hair dryers - but, as many instructions thoughtfully point out, should never be used for drying hair! The method of operation of a hot air gun is similar to a hair dryer: a fan pulls air into the body of the tool and drives it across an electric heating element and out through a nozzle.
For stripping paint, the heated air is directed onto the painted surface, causing it to soften so that it can be easily stripped off - either by using a stripping knife or hook. For best results it is best to work up the surface with the heat gun above the stripping tool, softening the paint just before the stripping tool reaches it. The tool is used one-handed, with the other hand to hold the stripping tool.
The effective temperature of any heat gun can be reduced by holding it further away from the surface, but having variable settings gives more choice.
For paint stripping, the maximum speed and the maximum air flow is generally required - these settings are also needed for other jobs such as soldering plumbing joints and freeing rusty nuts. There are other uses of the heat gun where having lower air flows and/or lower temperatures can be useful. Other uses for the heat gun include:
drying paint or varnish - 30 to 130 °C - care has to be taken as dust particles may be blown onto the paint/varnish.
drying out damp wood (before filling or painting) - around 100 to 200°C.
softening adhesive (such as when applying worktop edge trim or lifting floor tiles) - 300 to 400°C.
bending plastic pipes - 200 to 300°C.
heat-shrinking plastic film - 200 to 300°C.
welding some plastics - 330 to 400°C.