Backflash - Cause
Backflash will occur when on vaporization, the volume of the expanded gas sample expands to a greater volume than that of the inlet liner. The result of flashback is that solvent and sample can flow back into the inlet and purge gas lines causing contamination of your system. A really bad case can result in the need to rip out the plumbing and replace the inlet lines - maybe a hair dryer or a hot air gun could help. This effect is much more prevalent in splitless mode.
At 250° C and 10 psi inlet pressure 1.0 µL of the following substances will expand:
|methylene chloride||-> ->||0.39 mL|
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