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As Hairywol said, you should have nothing to worry about.

If the ambient temperature was 20 deg C ( 293 deg K absolute) and it rose to 30 deg C (303 deg C absolute) in the car, the absolute temperature and therefore the pressure in the bottle would only have risen by about 3%.

Quote: Originally posted by Bernie47 on 24/7/2012

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As Hairywol said, you should have nothing to worry about.

If the ambient temperature was 20 deg C ( 293 deg K absolute) and it rose to 30 deg C (303 deg C absolute) in the car, the absolute temperature and therefore the pressure in the bottle would only have risen by about 3%.

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Thats not the calculation for a liquid (which is the case for butane) and the vapour pressure comes into effect, butane is at zero pressure at 0C .  At 21.1C the vapour pressure is 16.9psig and at 32C its 29.8psig. A bit more than that more like a 76% increase but you need that pressure to get the gas out the tank! But the tanks are rated to 30bar which is 435psig so you have a long way to go before there would be an issue. I also ead that it is rated to 87C so I would only run for cover if your car is onfire.