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5.5.2
Treatment systems for softwood
Treatment system 1:
The base coat may consist of a solvent or CO2 based preservative with the application method
employing vacuum or super critical impregnation.
Absorption must meet the requirements regarding critical value contained in EN
599-1.
Penetration must meet the requirements for Class NP3 in EN 351-1 (i.e. at least 6 mm lateral
penetration in sapwood).
The preservative used must provide effective protection against fungal attack and meet the
performance requirements when testing in accordance with Hazard Class 3, cf.
6.3 paragraph b) and Table 3 of EN 599-1 including blue stain testing.
The preservative used must further be approved by the Danish Environmental Protection
Agency.
The impregnation process must be performed in an impregnation plant subject to in-house and
external inspection under the rules listed in NTR document number 3: 1998 "Nordic
Requirements concerning quality control and labelling of preservative treated timber".
Surface treatment must be performed using products and methods resulting in a treatment
meeting the following requirements including performance requirements under EN 927-1:
 The use classification must be stable - cf. 4.1 and Table 1 (suitable for use on a stable base
such as windows and doors).
 The coat must have an average thickness greater than 60 m – cf. 4.2.1 d).
 The treatment must be opaque or semi-transparent - cf. 4.2.2 a) and b).
The surface must further meet the performance requirements listed in Annex 14 of these
Requirements.
It must be possible to trace the product used back to the tests on which the manufacturer's
product classification is based.
The wet film applied must be subject to systematic checks and the results recorded.
Treatment system 2:
The base coat may consist of a solvent or CO2 based preservative with the application method
employing vacuum or supercritical impregnation.
Absorption must meet the requirements regarding critical value in accordance with EN 599-1.
Penetration must meet the requirements for Class NP2 in accordance with EN 351-1 (i.e. at
least 3 mm lateral penetration in sapwood).
The impregnation solution used must provide effective protection against fungal attack and
meet the performance requirements when testing in accordance with risk Class 3, cf. 6.3
paragraph b) and Table 3 of EN 599-1, including blue stain testing.
The impregnation solution used must further be approved by the Danish Environmental
Protection Agency.
Technical Requirements, 7th Edition, Rev.4, 2013