Tedlar Bags

Specification and Description of Tedlar Bag

Tedlar bags by us are designed to collect gas/air samples. These often required for analyzing air samples for VOCs (Volatile Organic Compounds), CO (Carbon Monoxide), H2S (Hydrogen Sulfide), sulfur hexafluoride, methane, mercaptans, radon, and other such gases.

The air sampling bags fitted with two components – a PVF (Poly Vinyl Fluoride) film and Teflon/PTFE valve fitting. Apart from these, we also provide SS (Stainless Steel) and PP (Polypropylene) valve fittings.

Making

The PVF/Tedlar film used in making the gas sampling bag has proven reliable from over five decades now, ever since DuPont discovered it in 1960. It’s excellent properties, including low absorption rate, higher tensile strength, chemical inertness, and resistance to corrosion and abrasion make it the best-suited material to capture samples of air/gas and store effectively for a significantly more extended period.

Apart from these properties, the material is exceptionally impermeable, meaning it restricts gases from within and outside from mixing and corrupting the gas/air sample. The content is also able to withstand extreme temperatures – cold and hot – making it efficient to use in extreme environments as well. The gas sampling bag is made to use in batch processing as well as continuous processing with equal efficiency.

Fittings

The Teflon valve fitting is a dual-purpose fitting. It fits perfectly with the Teflon hose which is attached to the valve. The silicon septum can be easily detached. The gas sampling involves using a special air-tight syringe to pour the gas sample through the septum port. The Teflon fitting equipped with a ball-valve type mechanism switch for ON or OFF operation; whereas there is a gate-valve mechanism in polypropylene fittings.

The combined valve and septum setting make it inherently more comfortable and more efficient to collect gas and air samples. Please take note that the Tedlar bags with the non-metallic fitting should be used to collect samples of sulfur compounds, as the SS valves are not suitable for it.

Technical Properties of Tedlar Bag

• Material (Film) PVF (Polyvinyl Fluoride)
• Material (Valve) PP (Polypropylene)
• Thickness (Film) 2 mil
• Optimal Operating Temperature 477 ˚ K
• Tensile Strength 7,980 psi
• Material’s Specific Gravity 1.69 g/ml
• Capacity: 500 ml, 1000ml, 2000ml, 3000ml, 5000ml and 10 liters

Applications of Tedlar Bag

A Tedlar bag is used to collect and store air and gas samples because it is light, stable, and chemically inert. It is widely used in indoor air quality monitoring to detect pollutants in homes, offices, and public buildings. In industrial areas, it helps quickly sample air during gas leaks or spills to assess worker safety. It is also used to collect gases from chimneys, flues, and ventilation systems for emission testing and regulatory compliance.

In hospitals, a bag is used to monitor anaesthetic gases in operating theatres to protect staff from long-term exposure. Environmental studies use soil gas and vapor sampling near landfills, fuel stations, and waste sites, where VOCs like benzene and formaldehyde are common. It is also useful for detecting leak from an underground storage tank.

Automotive and landfill emission testing relies on a bag to measure harmful gases that cause air pollution, smog, and health problems. In the laboratory, it is used for gas mixing, storage, and calibration. Overall, the bag is a reliable and practical tool for air and gas monitoring across health, safety, and environmental applications.

• Indoor air sampling
• Assessing the risk of exposure from gas spills/leaks
• Sampling air from flues/vents
• Measurement of anesthetic gases in operation theater
• Soil gas sampling
• Groundwater testing
• Grab sampling
• Gas blending
• Detecting leaks in underground storage tanks
• Sampling at hazardous waste disposal/management sites
• Chimney stack air sampling
• Calibrating gas standards

How to do Gas Sampling using a Tedlar Bag

• Select an unused Tedlar Bag and a hand-operated air sampling pump.
• Label the bag clearly with the sample code and the exact date and time of collection.
• Secure the pump tubing to the valve connector on the bag.
• Sealed the connection properly to prevent gas loss.
• Rotate the valve to the left to start gas flowing into the bag.
• Transfer the gas into the bag using steady pumping.
• Do not allow the bag to become full; leave some space to avoid pressure build-up and possible leaks.
• Once the required volume is collected, turn the valve to the right to seal the bag.
• Carefully detach the tubing after the valve is closed.
• Remove the gas sample through the valve sampling port.
• Use a gas-tight syringe to inject the sample through the septum for Gas chromatography (GC) analysis.

Safety Guidelines

• Keep sampling bag in a dust-free area, well away from chemicals or other possible contaminants.
• When a bag is intended for reuse, flush it thoroughly with nitrogen or another inert gas before collecting a new sample.
• Do not exceed 90% of the bag volume during filling under any circumstances.
• During air shipping, pack the filled bag into a sturdy, non-pressurized opaque container to prevent damage.
• Avoid using these bags for gases that are highly reactive or chemically unstable.
• Collect more than one bag of the same gas to ensure a backup sample is available in case of leaks or ruptures during transit.
• Store the filled bag away from direct sunlight and high temperatures to protect the integrity of the gas sample.
• A new Tedlar Bag should be used for each sample to ensure accurate, consistent results, thereby reducing contamination, error, and measurement uncertainty.

Tedlar Bag Not Recommended for

• Avoid the Tedlar Bag for samples tested 12+ hours after collection.
• Skip them for benzene or petrochemical samples.
• Don't use it for low-level contaminants; the bag background chemical may affect accuracy.

Why Shilpa Enterprises?

We are a leading name when it comes to manufacturing and supplying industrial-grade gas sampling bag. Our sampling bags are created using the finest of raw materials, thus ensuring completely clean air sampling in any condition and environment.

To learn more about buying bulk and customized Tedlar bags from India, drop an email using the contact details provided.