Barrier Property Testing of Organic Gas (Vapor)

With the growing demand for barrier property testing, organic gas barrier property testing has already been an important part of it.

Only a few organics are gaseous under normal temperature, such as methane; most of organics are liquid with volatility, such as ethanol. Therefore, the testing gas mentioned here are organic vapor.

Organic gases can lead to swelling of high polymer materials, and further affect their permeability obviously. Therefore, the testing methods of organic gases are quite different from that of inorganic gases. The biggest difference is the quite low gas concentration when testing. Considering the characteristics of organic gases, there should be an organic gas generating system to provide test gas of accurate concentration. For inflammable and non-toxic inorganic gas, the high concentration side should be of 100% concentration of testing gas; for flammable or toxic inorganic gases, the high concentration side should be controlled within the safe concentration scope; as to organic gas test, only when high concentration side is no higher than 100ppm, can we regard specimen swelling by organic gas as being no influence to specimen permeability.

Organic gas transmission rate can be tested with iostatic method. Labthink has developed professional iostatic method organic gas transmission rate testing device - PERME?OR2/410 Organic Gas Transmission Rate Testing System. This instrument is of patent design, and consists of transmission chamber, organic gas generator, timed sampling valve, isolation room and FID (flame ionization detector). It’s easy to operate, and it’s the organic gas transmission rate tester with highest automation.  The drafting of relevant national standard of this method has begun.

Though iostatic method should be applied for organic gas transmission rate testing, some applies differential pressure method (also widely applied in documentations) for some specific purposes. In fact, differential pressure method can be used for the organic gas transmission rate testing of certain organic gases. But, the testing instruments must be customized as that of flammable or toxic inorganic gases.

Further information please feel free to contact Shirley Wu via trade2@labthink.cn, skype:shirley-labthink, MSN:shirleywu_labthink@hotmail.com or (tel)0086-531-85068709.

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