The PAII Label – disposable photocatalytic activity indicator NEW!!! – pack of 6

First photocatalytic activity indicating label in the world


VIDEO: Our brand new Paii label in action

Check out our new instructional video detailing how to use the new SunCatalyst Laboratories photocatalyst activity indicating sticky label, which demonstrates the label being used both on a smooth glass surface, and on a rougher cement surface in conjunction with our Paii label binding enhancement spray. You can see the video here:

This label has been developed in conjunction with our customers that demanded an indicator that would be easy to use and understand for the end-users (especially those who only need to do a few tests, and so don’t require a pen or ink), yet applicable to most surfaces – as well as fast to respond to UV light.

The label shows a striking colour change from blue to pink when exposed to UVA light/sunshine after being stuck to a photocatalytic surface. The label doesn’t stain the surface as much as an ink and any residue is easily washed away with water.

It is most suitable for smoother surfaces like glass, tile, ceramic or paint, but can also be applied to less smooth surfaces such as concrete or cement when used in conjunction with our PAII Label Binding Enhancement Spray.  It is very sensitive and detects even low photocatalytic activity.

The label is unsuitable for reactively-coated surfaces which have chemicals present that may acidify or otherwise chemically alter the ink.  Although not common, this false colour change is usually seen in the dark (i.e. without irradiation) and in such cases none of the photocatalytic indicator inks are likely to be appropriate.  If in doubt which ink to choose to test your substrate – please send a sample of the material and we’ll be happy to advise on the most appropriate ink to use.

How it works:

  1. Peel the indicator label from its protective covering sheet.
  2. Attach the label to the photocatalytic surface under test, and try to break up any air bubbles trapped under the label. This ensures a fuller contact and enhances the colour change.
  3. Expose the label to sunlight or artificial UVA radiation.
  4. Note the amount of time taken for the label to complete its colour change to pink. Due to the high sensitivity of the label, any surface which takes longer than 60 minutes to complete this colour change can be regarded as inactive.

If you have trouble affixing the label to a surface, or if the response seems dull and/or spotty, it may be that your surface is too roughly textured for the label to be used alone. In these cases, we recommend using our PAII Label Binding Enhancement Spray – simply spray the surface 1 -2 times from a distance of around 10 cm a few seconds before applying the label, and follow above steps 2-4 as normal.