NTR Wood Durability Quality System issue several categories of certificates:
- Wood preservatives and modification methods, The NWPC technical group issue certificates and publishes a list of given certificate holders in “The Approval list”
- Control body that operates third party control scheme, The NWPC Board Approves a control body that conforms with the NTR requirements.
- Wood producers that operates according to the NTR-documents. Wood producers receives a NTR-certificate from the Control body. If all requirements from NTR-documents and the NWPCs policy are met the wood producer can produce NTR-marked wood products.
In this section you will find current and revoked approvals and certifications.