Would you like to use a Tedlar bag (or another type of gas bag such as Kynar, Multi Foil or Teflon) for taking air samples? There are various measuring methods, on this page we explain the simplest method using a Tedlar gas bag and an air sampling pump.
In addition, we have collected the most frequently asked questions for you at the bottom of this page. Do you have any additional questions? Please let us know via the contact form or send us an email at firstname.lastname@example.org. Do you know enough and do you want to order the Tedlar bags directly? Then you can easily do this via our webshop (also on account!).
Instruction for filling Tedlar bags
- Determine how many liters the Tedlar bag should be and take this bag to the sampling area.
- Make sure that the bag is not contaminated in any way.
- Keep an air sample pump or hand pump available with the necessary accessories such as suitable tubing (3/16″ internal diameter).
- Connect the tubing to the valve of the fitting. Then turn the fitting counterclockwise to open. Make sure you handle the bag with care, when opening (and closing) you should hold the fitting at the bottom while turning and not by the bag. This is to prevent too much force being applied to the bag, causing the fitting to become detached from the bag and causing leakage.
- Start by filling the Tedlar bag to 90% of its total capacity. Never fill the bag more than 90% to avoid leakage and bursting of the bag. Max. pressure for the bags is 2 PSI, at a higher pressure there is a risk of leakage.
- Once the bag is filled to its limit, close the fitting by turning it clockwise. If the fitting is closed, carefully remove the hose from the fitting.
- The air sample in the bag is now ready for analysis. How long the gas remains stable in the bag varies greatly per gas. Our advice is always to analyze the sample as soon as possible, preferably within the first 48 hours. For more information about the stability of the gases in the gas bags, please refer to this page.
- You can use a syringe and insert it through the septum to take a sample. You can find this septum through the hole at the top of the fitting. You can now use the sample for sampling in gas chromatography or other devices.
- Do you want to reuse the bag? Our advice is to use the bags once for reliable results. For example, you should not reuse the bag after sampling compounds found in parts per billion (ppbv) concentrations, reactive compounds, or compounds known to adhere to the surface of the bag. If you do want to reuse the bags, the bags must be thoroughly cleaned after use and flushed with purified air or nitrogen before they are used again.
FAQ Tedlar bags
How much can I fill the bag?
Never more than 90% of the bag’s capacity. This is to prevent leakage or the bag bursting.
What is the maximum allowed pressure for the bags?
The maximum pressure is 2 PSI. At a higher pressure there is a risk of leakage. Each Tedlar bag is tested for leakage in our production. The pressure in a fully inflated bag is about 2 PSI, we leave them overnight and check if there’s any leakage. To test the air pressure in bag a pressure gauge is connected to the fitting.
With which fittings are the Tedlar bags available?
We can supply the Tedlar bags with various fittings such as polypropylene, PTFE and stainless steel. All our Tedlar gas bags feature a patented 2-in-1 fitting that combines the valve and septum into one. You can simply turn the fitting open and closed. You can connect a hose (tubing) of 3/16″ (internal diameter of the hose) to the fitting. After sampling, you can pierce the septum with a needle to remove a sample from the bag.
Which fitting is most suitable for you depends on the temperature at which you want to use the bags. The polypropylene fitting is suitable for temperatures up to 93.3 degrees Celsius. The PTFE and stainless steel fitting are suitable for temperatures up to 107.2 degrees Celsius. Is there a chance that the fitting will be exposed to corrosive materials? Then we recommend the use of a PTFE or stainless steel fitting as they offer a high corrosion resistance.
We can also install different fittings on request, such as a Swagelok fitting or other customer-specific valves. Feel free to contact us for more information.
Which liters are available and what is the size of the bags?
See below an overview of the contents and dimensions:
- 0,5 liter, 12,7 x 22,86 cm
- 0,7 liter
- 1 liter, 22,86 x 17,78 cm
- 3 liter, 22,86 x 33,02 cm
- 5 liter, 40,64 x 25,40 cm
- 10 liter, 40 x 41,91 cm
- 25 liter, 50,8 x 60,96 cm
- 50 liter, 50,8 x 76,20 cm
- 100 liter, 50,8 x 121,92 cm
- 200 liter, 121 x 67 cm
- 500 liter, 121,92 x 168,64 cm
- 1.000 liter, 121,92 x 274,32 cm
At what temperature can the Tedlar bags be used?
The Tedlar bags can be used at high temperatures, depending on the fitting, the maximum temperature is 93.3 degrees Celsius (with polypropylene fitting) to 107.2 degrees Celsius (with stainless steel and PTFE fitting). The minimum temperature is -72 degrees Celsius.
For which gases are the Tedlar bags suitable?
The Tedlar gas bags are used for sampling a wide variety of gases. On this page we have made an overview of the different gases and which gas bags are most suitable. The Tedlar bags are a simple, cost-effective and convenient way to sample volatile organic compounds (VOC), inert gases, organic solvent gases and permanent gases. They are therefore suitable for sampling ambient air, indoor air and stationary source emissions.
How do you fill a Tedlar bag?
See the instruction at the top of this page 🙂
What is the thickness of Tedlar film?
The Tedlar bag bags are made of 2 mil (0.0508 millimeter) Tedlar® film from the company DuPont®. This material is strong, durable and chemically inert to a wide range of gases.
What material is Tedlar made of?
Tedlar is made of Polyvinyl Fluoride (PVF) film.
Are Tedlar bags also suitable for sampling breathing air?
Yes, we have special bags in our range for taking breath gas samples.
What type of hose/tubing can I connect to the fitting?
We recommend the use of PTFE tubing with an internal diameter of 3/16″ (4.8 mm). You can connect this tubing to the polypropylene, PTFE and stainless steel fitting. We can also supply the tubing if desired.
How long do gases stay stable in the Tedlar bags?
This differs per gas and we cannot give an unambiguous answer to this. Our advice is always to analyze the sample as soon as possible, preferably within the first 48 hours. For more information about the stability of the gases in the gas bags, please refer to this page.
Are the Tedlar bags suitable for slightly sensitive samples?
No, in that case we recommend the use of multi foil bags that are provided with aluminum foils that protect the samples from light.
Can I use Tedlar bags more than once?
Our advice is to use the bags once for reliable results. For example, you should not reuse the bag after sampling compounds found in parts per billion (ppbv) concentrations, reactive compounds, or compounds known to adhere to the surface of the bag. If you do want to reuse the bags, the bags must be thoroughly cleaned after use and flushed with purified air or nitrogen before they are used again.
Are other gas sampling bags available?
Can I order custom made bags?
Yes, we can also make Tedlar (or other type) bags to your requirements. We often get the question whether the bag can remain open on 1 side, that is certainly possible. We can also install multiple (or other) fittings on a bag. In addition, we can also supply extremely large bags that are used, for example, in SHED chambers for emission measurements. Please feel free to contact us so that we can see if we can help you with your issue.
Below is a photo of a large SHED chamber bag with internal tubing and custom connections. And also an image of a 3 liter Tedlar bag with a PTFE fitting and Swagelok fitting. These are just 2 examples of the bags we can produce.
What are the differences between Tedlar, Multi Foil and FEP bags?
On this page we have made an overview of the differences between the bags.
What is the delivery time if I place an order?
Which carrier are orders shipped with?
We use DPD and FedEx to ship our packages.