OSZS Teflon FEP gas sampling bag w/Side-opening stopcock valve & septum fitting 1L capacity, 7*8 inch 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 side-opening stopcock valve on the Tedlar PVF 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 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.
