Plastic welding can be applied to the creation of inspection windows. The transparent materials are easy to clean and maintain making them ideal for inspection windows. Plastic welding is particularly valuable in this application due to its ability to create a seal which prevents any gases/dust etc. escaping through the inspection window.
This type of inspection window lays flat within the rest of the wall and is ideal for certain product testing. For example if harmful gases may potentially be released in the trailing of a product. The seal created by the welded inspection window would totally protect any staff conducting the test.