The Technical Expert Group of the Nordic Wood Preservation Council has published the updated Approval List No. 106, effective as of 22 August 2025. This list outlines the wood preservatives and wood protection systems approved under the NTR scheme for use in industrial wood preservation across the Nordic countries.

What’s new in approval list 106?

The new list maintains the structure and categories as in List No. 105, with no new products added in this version. Only a few smaller adjustments are noted:

• Celcure M65 is renewed with a new “Approval valid until” date, 2029-12-31.

• impralit-ACQ 2100 have updated “Retention requirement… ” for Class A to 21 (18).

What has been removed?

No product has been removed from the approval list no 106 compared to list no 105.

Access the list

The full Approval List No. 106 can be downloaded directly from nwpc.eu.

For any questions regarding approvals, certificates, or transitions related to product changes, please contact the NWPC Secretariat.