Аннотация
The standard closed testers for flash point measurements may not be
feasible for measuring flash point in special atmospheres like oxygen
because the test atmosphere cannot be maintained due to leakage and
the laboratory safety can be compromised. To address these limitations
we developed a new "equilibrium closed bomb" (ECB). The ECB generally
gives lower flash point values than standard closed cup testers as
shown by the results of six flammable liquids. The present results
are generally in good agreement with the values calculated from the
reported lower flammability limits and the vapor pressures. Our measurements
show that increased oxygen concentration had little effect on the
flash points of the tested flammable liquids. While generally regarded
as non-flammable because of the lack of observed flash point in standard
closed cup flash point testers, dichloromethane is known to form
flammable mixtures. The flash point of dichloromethane in oxygen
measured in the ECB is -7.1 degree signC. The flash point of dichloromethane
in air is dependent on the type and energy of the ignition source.
Further research is being carried out to establish the relationship
between the flash point of dichloromethane and the energy of the
ignition source.
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