BAUX Acoustic Wood Wool
Yes, if adding stone wool (40mm) behind BAUX Wood Wool, you will be able to achieve A-Class. You can add stone wool to your BAUX order.

BAUX Acoustic Pulp
At the moment BAUX has not performed any acoustical tests to verify acoustical ratings for other installation methods than directly mounted to the wall. However, adding stone wool (40mm) behind BAUX Acoustic Pulp will increase the sound absorption. Tests will be conducted during 2019 to verify the exact result with stone wool backing.

BAUX Acoustic Felt
BAUX Acoustic Felt as a stand alone divider or deskstand does not offer any additional options to further increase the acoustic rating.