Rank: Forum user 
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I'm currently performing a DSEAR for an extremely flammable aerosol (its UEL is 17.6 % and LEL is 0.7%.). This would generally be sprayed for a few seconds at most. The area in which it's used is basically a large office with a few PCs and no ignition sources. The area is well ventilated. Would you consider that there's a case for explosive atmospheres?
Cheers all!
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Rank: Super forum user
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Markeland
There are NUMEROUS ignition sources, not least the "few PCs". The answer to your question is probably not unless spraying close to the ignition sources, but what does it say on the tin?
When it comes out of the tin, it will be above the UEL, but soon be below the LEL, so it's the small area around the tin, where the concentration is between the two limits that needs your thoughts. It could well be the sort of material that you buy off the shelves in B&Q (other retailers are available) and use at home, when you wouldn't be thinking about DSEAR?
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 1 user thanked peter gotch for this useful post.
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Rank: Forum user
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Thanks Peter. On the ignition sources, just wanted to state that it's not as though there's naked flames in the area where the substance would be used. The tin says the usual such as shut off all ignition sources, ensure adequate ventilation etc. It's basically used as a degreaser so it'd be sprayed on something (generally an electrical appliance which is isolated) and then wiped down.
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Rank: Super forum user
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HSG 140 gives some advice on spraying of flammable materials it is orientated toward paint spraying and coating but it could give you some help... https://www.hse.gov.uk/pubns/priced/hsg140.pdf
From what you describe this is relatively low risk so long as you have good natural or machanical extraction..
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