Rothenberger Butane/Propane Mix Butane / Propane Mixed Gas Cylinder 175g (72905)

Rothenberger Rofire 35770 will fit our propane and map/pro gas cylinders only. Unfortunately, it will not fit the butane / propane Mixed gas cylinder. Hope this helps.

Pure propane has a boiling point of -43 °F (-42 °C), which means that it has a high vapour pressure at common ambient temperatures, and therefore requires a heavy steel canister to safely contain it. So canisters of pure propane are too heavy. Butane is easy to contain because it has a boiling point of 31 °F (-1 °C), but it doesn’t vaporize well when the temperature drops below freezing. Thus, pure butane has major limitations for cool-weather. The solution is to use a blended fuel consisting of propane, n-butane, and iso-butane. The thinner canisters can handle up to about 30% propane, with the remainder being n-butane and/or iso-butane (boiling point 12 °F/-11 °C). The propane/ iso-butane mix vaporizes well at lower temperatures and provides enough vapour pressure for adequate performance at colder temperatures.

Our 35510 BUTANE / PROPANE mix cylinder has a 7/16” EU connection, which is the same connection as the go system cylinders, so it is possible to use their torch on our cylinder and vice versa. I hope this helps answer your question.

This, alongside the other 65mm diameter Rothenberger cylinder, will fit my Taymar LG870 blowlamp which takes RF80 and RF89 range of cylinder/cartridge. I went for the 65mm version so my base stabilizer would fit, instead of the 40mm type also on sale. Thing is, if like me you have had that now obsolete torch (I have had mine for twenty six years and still on original cylinder!), the o ring seal within the torch which provides sealing may not be good anymore, so check this too, to be safe.