IML-FEV31 Mud Logging FEP film gas sampling bag
Introduction:
FEP film has excellent chemical resistance, strong acid and alkali corrosion resistance, organic solvent resistance, and low adsorption. The water vapor permeability of Teflon FEP membrane is 1.3g / m2.24h.0.1MPa; the oxygen permeability is 2400cc / m2.24h.0.1MPa (this data is a measured value, not a guaranteed value).
Scope of application:
FEP has the best chemical resistance and corrosion resistance among fluoropolymers and has low adsorption. Teflon FEP gas sampling bag is suitable for high-precision ppm and ppb level analysis and sampling. It can collect and store a variety of highly corrosive, highly chemically active gaseous and liquid samples, as well as samples of organic volatile VOCs.
Noted:
• For sulfide and halogen gas, high content such as percentage level or low content such as ppm level is not recommended.
• Because the two-component adhesive used in the aluminum-plastic composite film can volatilize organic substances such as benzene, ketones, ethers, esters, etc., it should be noted that the organic compounds remaining in the aluminum-plastic composite film can precipitate and can pollute the gas in the sampling bag Samples can cause interference with analytical data.
• If the gas sampling bag is reused, it should be replaced and cleaned multiple times.
• The storage time of the gas sample in the sampling bag should not be too long. The specific storage time has a lot to do with the detection time required for experimental analysis, the type of gas composition, temperature and humidity, and pressure. Generally speaking, inert pure gas can be used as Temporary storage containers are recommended to be stored for no more than 72 hours; for common standard gases, flue gases, ambient atmosphere, etc., it is recommended to be stored for no more than 24 hours.
• To reuse the sampling bag, it must be washed and replaced many times. It is recommended to collect the same sample in the same sampling bag, and do not mix them.
• The sample bag is heated and replaced with high-purity nitrogen to reduce the interference of organic precipitates.
• The inflation pressure does not exceed 6KPa. Visual observation is that the airbag is fully bulged, but it is not taut when pressed with fingers. Overpressure filling can cause burst damage to the gas sampling bag.
• During storage and use, keep away from fire and high temperature, and avoid puncture by sharp objects.
• When sampling and cleaning, please do not exceed 80% of the calibration volume. Taking a 1L sampling bag as an example, it is recommended that the sampling volume does not exceed 0.8L.
• For precise experimental analysis, a blank sample bag must be used for comparison and background deduction.
• For high-pressure and high-temperature gas should be sampled under normal temperature and pressure, the specific treatment method depends on the actual situation.
• For negative pressure gas, a vacuum pump with appropriate power and flow rate should be used for sampling.
• For the gas containing particles, dust and aerosol, a filtering device should be used to prevent contamination of the sampling bag, which will make cleaning difficult.
