Rank: Forum user 
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I have recently undertaken exposure monitoring for Methyl Methacrylate, and have calculated the level to be 4mg/m3, which is well below the WEL.
Question - Can I use this figure to determine what this is in terms of volume in air, as I want to know where this value is in relation to the explosion limits
Barry
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Rank: Super forum user 
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Barry, your result will presumably be for the breathing zone of exposed workers. Depending on the specifics of your situation this result may be very different from the concentrations at other locations that may have ignition sources.
As a very general rule of thumb however, and I expect some indignant contradictions from others on this forum, if the concentration is well below WEL you are very likely to be even more below the LEL for the substance.
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Rank: Super forum user
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In theory I would agree broadly with stuff4blokes.
The lower explosive limit for methyl methacrylate is of order 2%, which is well above any exposure limit.
However (and its a big however) this substance has a high relative molecular mass - around 100, so it is about 3 times more dense than air. This means that a vapour cloud released from this material will tend to stay low in the room, and not mix fully with the air. There could easily be locations in a room where it reaches the explosive limit and, like diethyl ether, it is possible for a flame to flash through the vapour cloud back to the source of the material.
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