Fluoroplastic manufacturers

Case Study - Large capacity gas sample bags for a VOC testing project.

We have recently supplied Tedlar® bags for VOC testing of in-cabin automotive components.  These needed to be tested for volatile organic compounds (VOC's) and carbonyl traces at elevated temperatures.

The customers wish list was:

  • A large capacity gas sample bag suitable for VOC testing.
  • The gas sample bag needed to be open on three sides, so the components to be tested could easily be inserted.
  • The customer needed the ability to seal the bag once the components were inside.
  • The sample bag needed to large enough and robust enough for re-use.
  • The bag needed to be suitable for temperature cycling.

 

Solution

The design of the bag, material choice, orientation of the PTFE connectors and the closure mechanism was decided between Adtech and the customer.  This ensured the sample bag was easy to handle and that only minimal stress would be applied to the bag in the area around the connectors, whilst the sample was being taken.

It was agreed that Tedlar® film in 50 micron would be the best choice for this application as the film is robust, has a working temperature range of -70 °C to +107 °C and is already widely used for testing of VOC's.

Tedlar® film contains no plasticisers, so it has excellent aging properties and remains tough and flexible over a broad temperature range.

Using our specialist welding equipment, that's designed to weld long lengths of material, we were able to weld several sections of 50 micron Tedlar® film into large sheets.  Which enabled us to produce Tedlar® gas sample bags that measured 2500mm x 2500mm. 

Due to it's inertness FEP tubing was selected for transferring the sample from the large gas sample bag into smaller capacity Tedlar® gas bags, so that the sample could be transported for testing.