Thank you Ahmed Y.Yassin. Your suggestions are much appreciated. Happy to find this.

Most IR spectrometer manufacturers offer IR database - but not for free. They are connected to the instrument software and produce % agreement with experimentally found spectra.

http://www.ftir-libraries.com/ - this one provides free trial version

http://www.infrared-spectra.com/

http://www.ir-spectra.com/

http://www.bio-rad.com/en-ch/product/ir-spectral-databases

http://www.ftirsearch.com/

http://guides.library.jhu.edu/c.php?g=202495&p=1335113

http://wwwchem.uwimona.edu.jm/spectra/IRIndex.html

I hope it helps

Gyorgy Banhegyi , Thank you so much for kind attention and valuable response for this.

Bio-Rad hosts the world's largest IR spectral database, with over 260,000 spectra. We have a very large number of polymers in the collection.

SpectraBase (https://spectrabase.com) is free, and you can look up the spectra of compounds by name, CAS Registry Number, or InChIKey. You can overlay your own spectrum with the reference spectra available on SpectraBase, zoom in, etc. If you want to use the spectrum in a publication or presentation, we have a "Cite" button that will tell you the preferred method for citing SpectraBase.

If you need to identify unknown spectra, you can do a free two-week trial of Bio-Rad's KnowItAll software and databases: http://www.knowitall.com/trial2018

Finally, there is a free Academic Edition of our KnowItAll software available as well: http://www.knowitall.com/academic

Best regards,

Greg

Thank you Gregory Banik for the wonderful information and very well appreciated.

This is a great reference for IR identification of polymer type:

Article Validation of ATR FT-IR to identify polymers of plastic mari...

Win Colton Cowger developed an open-access FTIR library for microplastics. Contribute! http://www.openspecy.org/

If you have any questions about Open Specy please feel free to PM me.

On the supplementary information of my papers you can find the virgin and weathered IR spectra of common polymer types, as well as common contaminants (e.g. wood, feathers, etc):

A new approach for routine quantification of microplastics using Nile Red and automated software (MP-VAT)

Identifying a quick and efficient method of removing organic matter without damaging microplastic samples

Hope this helps.

Try the Nicodom Libraries

I recommend these databases:

- https://www.bio-rad.com/

- http://www.ftir-libraries.com/

In the future, we need standard database (or library) for identify microplastics. Otherwise, we cannot compare the results each researcheres analyze.

Try this

https://www.bio-rad.com/