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Posted By Dave Adams MIOSH
I am bit ignorant on this issue. There are two methods for ascertaining flash point (closed and open cup methods). Both the transport regs and CHIP refer to flashpoints for flammable liquids and neither (it seems to me) defines which method is to be used to determine these experimentally. Using the 2 methods can give a 5 - 8 degree difference. Hwen this is borderline this can affect the classification of material as flammable or not. Which do we use / quote on our msds's or transport paperwork.
Help!
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Posted By Oil Man
Hi Dave
I would have thought that there should be a standard advised flash point for each specific products (there are in the oild industry), You should be able to get them from the safety data sheet. If this doesn't help and you do end up having to do flash testing the seta flash instrument is very good. I would have thought you should use the lowest reading if there is any doubt.
Hope this helps.
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Posted By Gareth Williams
Flash points are determined experimentally by heating the liquid in a container and then introducing a small flame just above the liquid surface. The temperature at which there is a flash/ignition is recorded as the flash point.
Two general methods are called closed-cup and open-cup. The closed-cup method prevents vapours from escaping and therefore usually results in a flash point that is a few degrees lower than in an open cup. Because the two methods give different results, one must always list the testing method when listing the flash point. Example: 110 oC (closed cup).
Trust this helps
Gareth
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Posted By Descarte
^^ is that not just re-writing what he has already stated.
There are 2 methods
They give different results
Both methods can be shown on the MSDS sheet as both are legitimate tests
Question - which result do you use for classification of flammable materials, closed or open cup as will give different classifications of flammability
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Posted By Dave Adams MIOSH
Thanks everyone. I'll do what I normally do in these situations and just do what feels right!
Cheers
Dave
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Posted By Jack
I've not checked, but it is probably in the EU directive.
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