Plastics, Polymers and Paints

The Sagitto system can be used to identify plastics, measure paint coating thickness, and help determine the curing point of epoxy resin mixes.

Plastic Polymer Recycling Codes

This demonstrates a classification model for plastic polymers, using near-infrared (NIR) spectroscopy data. As you can see from the graph at right, different types of plastic polymers have quite different absorption spectra in the 900nm - 1700nm wavelength range. Sagitto is able to use these differences to build very accurate classification models, using sophisticated machine learning techniques.

Recycling Number Abbreviation Polymer Name
1 PET Polyethylene terephthalate
2 HDPE High-density polythylene
3 PVC Polyvinyl chloride
4 LDPE Low-density polythylene
5 PP Polypropylene
6 PS Polystyrene



NIR is an excellent technique for identifying plastic polymers for recycling purposes.

Identify Paint Types and Coating Thickness

Sagitto's miniature NIR provides a very rapid, portable and accurate technique for identifying the composition of paints and liquid polymer coatings, as well as measuring their thickness.

NIR is an excellent technique for measuring the thickness of paint and polymer coating.
NIR is an excellent technique for measuring the thickness of paint and polymer coating.

Monitor Curing Process for Epoxy Resin Polymers

Sagitto's miniature NIR provides a very rapid, portable and accurate technique for measuring the curing process of epoxy resin polymer mixtures. Below we show the change in absorbance spectra of two different formulations of Aralditeā„¢.

NIR is an excellent technique for measuring the curing process of epoxy polymers.
NIR is an excellent technique for measuring the curing process of epoxy polymers.