There are openly available databases which could be used for that.
For example pyroomacoustics contains a quite extensive database of absorption coefficients for various materials found here
Alternatively, a lot of data can be found in books such as M Vorländer - Auralization 2nd edition (Annex).
PTB also has a collection of data available at https://www.ptb.de/cms/ptb/fachabteilungen/abt1/fb-16/ag-163/absorption-coefficient-database.html
There are openly available databases which could be used for that.
For example pyroomacoustics contains a quite extensive database of absorption coefficients for various materials found here
Alternatively, a lot of data can be found in books such as M Vorländer - Auralization 2nd edition (Annex).
PTB also has a collection of data available at https://www.ptb.de/cms/ptb/fachabteilungen/abt1/fb-16/ag-163/absorption-coefficient-database.html