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Closed cup vs. Open cup flash point

Closed cup vs. Open cup flash point

(OP)
Can someone help a non-chemical engineer? Building codes define combustible and flammable liquids based on their closed cup flash point. If provided MSDS information lists open-cup flash point, is their any way to correalate the two?

RE: Closed cup vs. Open cup flash point

Quoting from wikipedia:

Closed cup testers give lower values for the flashpoint than open-cup testers (typically 5–10 K) and are a better approximation to the temperature at which the vapour pressure reaches the "lower flammable limit" (LFL).

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