OSZS New Devex Multi-layer gas sampling bag w/Daul twist-type straight valve & septum fitting, 7*8 inch 10-PK.
OSZS New Devex Film is a specialized membrane developed by our company for use in sampling bags. Tailored to meet specific customer needs, this film is created in collaboration with several specialized companies using internationally advanced film-making technologies. With a thickness of approximately 75µm, it is thinner than aluminum-plastic composite films, yet offers significantly better elasticity, preventing issues of hardening and brittleness in cold conditions. Most importantly, the New Devex Film has a low background, resulting in minimal contamination of gas samples, thus satisfying high customer standards for sampling bags. Compared to aluminum-plastic composite films, New Devex Film boasts advantages such as lower background, reduced contamination of filled gas samples, superior elasticity, affordability, and high cost-effectiveness. Testing by authoritative institutions shows that the performance of New Devex Film greatly exceeds that of aluminum-plastic composite films, making it the ideal specialized membrane for gas sampling bags, widely adopted by customers and currently the most cost-effective option worldwide.
Standard aluminum-plastic composite films are made from solvent-based adhesives that release a significant amount of volatile organic compounds (VOCs), undoubtedly contaminating gas samples. In contrast, the inner layer of New Devex Film uses eco-friendly adhesives, resulting in low VOC emissions that prevent contamination of gas samples and avoid interference with analytical data. The residual organic solvent content in New Devex Film is between 0.1mg and 0.3mg/m², which is only 5% of that found in aluminum-plastic composite films, making it a high-performance replacement.
Applications of New Devex Gas Sampling Bags:
Suitable for stable, low-reactivity gases such as petrochemical cracking gas, natural gas, coalbed gas, flue gas, ambient air, and process reaction gases, widely used in petrochemicals and environmental monitoring for gas sample collection and preservation. These bags ensure stable low concentrations (ppm levels) for 1 to 3 months.
Applicable for the collection and detection of total non-methane hydrocarbons.
Can hold low concentrations of industrial gases such as hydrogen (H2), oxygen (O2), nitrogen (N2), argon (Ar), methane (CH4), carbon monoxide (CO), and carbon dioxide (CO2).
Not recommended for highly reactive, corrosive, or oxidizing gases such as nitrogen oxides, strong alkaline gases, and halogen gases; also not advisable for very low concentrations like ppb levels.
Suitable for light-sensitive gas sampling that requires protection from light.
Standard sizes for the Aluminum-Foil (Multi-Layer) Gas Sampling Bags 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 provides 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.
