OSZS Devex Multi-layer gas sampling bag w/Side-opening stopcock valve & septum fitting 1L capacity, 7*8 inch 10-PK.
The OSZS Devex Multi-layer gas sampling bag is a high-performance upgrade to aluminum-plastic composite gas sampling bags. The Devex multilayer film, developed by our company in collaboration with several renowned specialists, uses advanced international film production technology to create a specialized film for gas sampling bags. This film consists of a polyurethane (PET) film, nylon (PA) film, aluminum foil (AL), and polyethylene (PE) film, all bonded with an eco-friendly adhesive. The outer layer is made of polyurethane (PET) and the inner layer is polyethylene (PE), with a thickness of 130 μm.
The Devex multilayer film is fundamentally different from aluminum-plastic composite film. It has lower adsorption, greater chemical stability, excellent mechanical strength, superior chemical and corrosion resistance, a lower permeability rate, and its gas barrier properties are 1,000 times better than those of aluminum-plastic composite film. As a specialized film for gas sampling bags, the overall performance of the Devex multilayer film surpasses that of PVDC film (marketed as Saran by Dow Chemical Inc.). The inner layer of the Devex multilayer film uses an eco-friendly adhesive, leaving no residual organic compounds such as benzene, ketones, ethers, or esters, and does not release volatile organic compounds (VOCs), ensuring that gas samples inside the bag remain uncontaminated.
The Devex gas sampling bag is suitable for environmental monitoring, odor analysis sampling, and high-precision ppm-level sampling. It can be used to contain gases with stable chemical properties and low chemical reactivity, such as petroleum cracking gas, natural gas, coalbed methane, flue gas, ambient air, process gases, and inorganic gases like nitrogen, hydrogen, oxygen, and argon. However, for gases with high chemical reactivity, such as sulfides, nitrogen oxides, and halogen gases, particularly at low concentrations like ppb levels, it is not recommended for use.
Standard sizes for the Devex Multi-layer gas sampling bag range from 0.5L to 6000L, with custom sizes and configurations available upon request.
The OSZS side-opening stopcock valve on the Devex Multi-layer gas sampling bag features inlets and outlets that are parallel to the film plane, with an external sampling tube having an outer diameter of 6.3 mm.
The valve includes a sampling cap with a silicone rubber septum, which is isolated from the gas inside the sampling bag by the valve mechanism. The silicone septum is exposed to the gas only when the valve is in the open position. To extract a gas sample using a sampling needle, rotate the valve handle to align it with the sampling cap, allowing the gas inside the bag to come into contact with the silicone septum. Once sampling is complete, rotate the valve handle 90 degrees to close the valve, thus isolating the gas inside the bag from the septum.
This design ensures that the silicone rubber septum does not remain in extended contact with the gas, thereby mitigating the risk of septum corrosion or sample contamination.
OSZS provide gas sampling bags free of charge for testing, but the shipping costs are the responsibility of the customer. To ensure you have accurate information on the shipping fees, please send your detailed shipping address and related information to max@oszs.com. We will promptly respond with the relevant cost details.
For all international orders, OSZS requires payment in advance. You can choose to pay via PayPal or wire transfer. Please email max@oszs.com to obtain our account information and further payment instructions. We are committed to providing you with a fast and secure payment service, ensuring your order is processed smoothly.
