Our company HedeTech Co., Ltd. and professional companies together researched anddeveloped DEVEX with international advanced technology specifically for making high quality gas sampling bags.DEVEX is very low background,little contamination and good elasticity ,can satisfy foreign customers high requirements.
     New DEVEX film is composed of total 11 layer films (PET, PA, Aluminum, PE, etc) with thickness around 75um thinner than Aluminium-plastic(multi-layer)gas sampling bags and better elasticity,can't become hard-brittle when cold like Aluminium-plastic(multi-layer)gas sampling bag, it has superb strength and low permeability,meanwhile it possesses excellent chemical inertness and stability.Especially when Aluminium-plastic(multi-layer)gas sampling bag cannot meet the requirements and using fluorine polymer cost too much,DEVEX gas sampling bag is the best choice.Being detected by authoritative organizations DEVEX film is superior to Aluminium-plastic composite film,so DEVEX gas sampling bags are of the most value for money at home and abroad,and widely used by customers abroad.
 

Multi-Layer Foil

     Ideal for sampling and storing H2S, and for low molecular weight compounds such as Methane, CO/CO2, Hydrogen, and inert gases which are not stable in Tedlar, Kynar, or FEP. Water- and vapour-proof, these flexible bags protect light sensitive compounds. Bags are available with several fitting and valve options. They provide up to five day sample stability with minimal absorption.

Features:
•composed of total 11 layer films
•very low background,little contamination and good elasticity
•superb strength and low permeability
•excellent chemical inertness and stability
•wide range of applications
•low price and good value for money
•Normal Aluminium-plastic composite film is glued of solvent adhesive,can volatile alarge number of organic volatile impurities that can pollute the sample gas no doubt,DEVEX film is glued of environmental protection adhesive,precipitationamount of organic volatile chemicals(VOCs)by inner layers is extremely low,thereby avoid sample gas inside the bag being polluted and prevent the interference of analysis data.The organic solvent remnant amount of DEVEX film is 0.1mg~0.3mg/㎡,which is 5% of Aluminium-plastic composite film,so DEVEX film is the ideal high performance substitute for Aluminium-plastic composite film.
•Standard Devex Gas Sampling Bag Sizes:0.5L,1L,2L,3L,4L,5L,8L,10L,15L,20L,30L, 40L～6000L or customized size.
Select from a variety of sizes to suit your needs.

Contact:

Judy  ▕ Foreign Trade Dept Manager 

Applicable scope:
•Devex gas sampling bags can fill the gas being of stable chemical properties,such as: pyrolysis gas, natural gas,coal bed gas, smoke dust gas, ambient atmosphere, technological process reaction gas.It is widely used in petrochemical industry and environmental monitor etc. for gas sampling and save. Devex gas sampling bags can ensure that the low concentration(PPM)component is constant for 1-3 months.
•Devex gas sampling bag can be used in sampling and detection for non-methae total hydrocarbon gas.
•Devex gas sampling bags can fill low level of hydrogen(H2),oxyen(O2),nitrogen(N2),argon(Ar),methane(CH4),carbonic oxide(CO), carbon dioxide(CO2).
•Devex gas sampling bag is not recommended to use for the gas with high chemical,corrosivity and strong oxidizing property such as: hydrogen sulfide, nitrogen oxides,strong basicity gas and halogens at low ppb level.
•Devex gas sampling bags apply to lucifuge sampling for Photosensitive gas.
 

Operating guide & Precautions:
• Avoid filling pressure higher than 6000Pa. Fill gas until the bag is fully expanded, however, it is not so tense when you press it using your finger.The overpressure filling can cause gas sampling bag burst damage.
• Operating temperature: －15℃～＋60℃.
• Keep away from flame and high temperature when filling and storage. Avoid contacting sharp stuff.
• Before use, flush sampling bags three times with the gas you want to fill.
• The connection of valve and instrument or the equipment best be adopted correspongding latex tube or silicone tube transition.
• For sulphide and halogen gas ,high content such as the percentage level or low content such as PPM level are not recommended to use
• As the composite membrane using two-component adhesive when composition,it can volatilize benzene, ketones, ethers, esters and other organic matter,So we should pay attention to the Aluminium-plastic composite membrane separating out the residual organic matter can pollute the sampling gas inside the bag,analysis data can cause interference.
• The gas sampling bag should be cleaned repeatedly replacement if it is reused. Suggest the same sample bag collecting samples of the same kind gas, don't mix
• The sample gas in sampling bag to save time should not be too long,specific saving time depend on detection limit of experimental analysis requirement,gas component species,temperature and humidity,pressure,etc:generally,for pure inert gas,sampling bag can be used as a temporary storage container and recommended storage time less than 72 hours;for standard gas,flue gas,ambient atmosphere,recommended storage time less than 24 hours.
• High purity nitrogen gas heating replacement can reduce the interference of organic deposition
• When sampling and cleaning,please do not exceed 80% of the calibration volume,take 1L sampling bag for example,suggest sampling volume is less than 0.8 L.
• There must be a blank sample compare for precise experimental analysis to do background deduction.
• For high-temperature high-pressure gas should be down to normal temperature and pressure to sample,specific treatment method according to actual situation.
• For negative pressure gas, should be sampled by appropriate power and flow rate vacuum pump.
• For the gas containing particulate matter,dust and aerosols,should adopt filter to prevent polluting the sample bag,then difficult to clean.
 

Packaging & Shipping:
• Reply your inquiry within 24 hours
• Experienced staffs answer all your questions in fluent English
• Exclusive and unique solution can be provided to our customer by our well-trained and professional engineers and staffs.
• Special discount and protection of sales area provided to our customers