OSZS New Devex Multi-layer gas sampling bag w/Stopcock 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 stopcock straight valve on the Devex Multi-layer gas sampling bag is positioned perpendicular to the film surface, with an external sampling tube featuring an outer diameter of 6 mm. The stopcock straight valve is designed with a self-sealing mechanism, ensuring a secure seal without any rubber components coming into contact with the gas inside the collection bag, thereby eliminating the risk of sample contamination.
The valve includes a sampling cap fitted with a silicone rubber septum, with the septum's exposure to the gas inside the sampling bag regulated by the valve. The silicone septum only interacts with the gas when the valve is in the open position. To extract a gas sample using a sampling needle, rotate the valve handle so that it aligns with the sampling cap. This action allows the gas inside the bag to come into contact with the silicone septum. After completing the sampling process, rotate the valve handle 90 degrees to close the valve, effectively isolating the gas inside the bag from the septum.
This design minimizes prolonged contact between the silicone rubber septum and the gas sample, reducing the risk of septum corrosion by the gas or contamination of the gas sample by the septum.
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.
