OSZS Teflon FEP gas sampling bag w/Stopcock straight valve & septum fitting, 1L, 10-pk
The film of OSZS Teflon FEP gas sampling bags is made from fluorinated ethylene propylene (F46), specifically FEP film, with a thickness of 0.07 mm. The FEP trademark is owned by DuPont Co under the name Teflon FEP. FEP is one of the most chemically inert materials used for manufacturing gas sampling bags, functioning effectively in extreme temperatures ranging from -400°F to 400°F. Its sealing difficulty is significantly greater than that of PVF (Tedlar) and polyvinylidene fluoride (PVDF) films. In 2003, our company successfully addressed the challenge of heat sealing FEP film, producing gas sampling bags for the first time with uniform, flat seals, minimal shrinkage, and high strength.
Teflon FEP film exhibits excellent chemical resistance, withstands strong acid and alkali corrosion, is resistant to organic solvents, and has low adsorption properties, making it inert to most chemicals while demonstrating low permeability that minimizes sample loss. The water vapor permeability of Teflon FEP is 1.3 g/m²·24h·0.1 MPa, and the oxygen permeability is 2400 cc/m²·24h·0.1 MPa (these values are measured, not guaranteed).
All four sides of Teflon FEP sampling bags are heat-sealed to ensure complete chemical resistance and leak-proof operation.
The chemical resistance and corrosion resistance of Teflon FEP are among the best in fluoropolymers, with low adsorption characteristics. Teflon FEP gas sampling bags are suitable for high-precision ppm and ppb level analysis, capable of collecting and preserving various highly corrosive and chemically active gaseous and liquid samples, as well as volatile organic compounds (VOCs). They can also be used for gas sample analysis, extracting air samples from chimney exhaust systems, monitoring air quality, or calibrating instruments in the field.
The OSZS stopcock straight valve on the Tedlar PVF 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.
