OSZS Devex Multi-layer gas sampling bag w/Daul twist-type straight 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, and 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 dual twist-type straight valve on the Devex Multi-layer gas sampling bag is constructed from ABS material. The valve stem, which has an outer diameter of 5 mm, functions as the gas conduit.
Rotating the valve stem clockwise causes it to move downward, engaging the lower O-ring and sealing the valve seat, thereby closing the valve. Conversely, rotating the valve stem counterclockwise moves it upward, sealing the upper O-ring against the valve cap, which allows gas to flow through the valve stem and opens the valve.
The travel distance of the valve stem during this operation is minimal. During the transition between open and closed positions, the valve briefly connects with the external environment, causing the gas inside the sampling bag to flow from the valve seat hole into the valve cap chamber and then escape through the valve cap hole. Therefore, it is essential to rotate the valve stem quickly and avoid leaving it in an intermediate position.
When performing gas exchange operations with the sampling bag, the valve must be fully opened, and the valve stem should not be rotated during the process.
The twist-type straight valve is designed for ease of use and is ideal for collecting and preserving inorganic and organic gas samples that are non-corrosive to ABS or silicone rubber.
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.
