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Owner of data set Pölkky Oy |
Technical purpose The declaration is made for average impregnated timber manufactured at Pölkky Oy’s production site
in Oulu. Impregnated timber is made of responsibly sourced pine (Pinus sylvestris) and spruce (Picea
abies). Log procurement and the manufacturing processes at Pölkky Oy are FSC® and PEFC certified.1
Dimensions and lengths of the products varies on a wide range as well as the end use of the product.
Impregnated wood is commonly used in outdoor applications, such as decking, fences, playgrounds,
and landscaping structures, where durability and resistance to weather, moisture, and pests are es-
sential.
Moisture content for impregnated timber after the process can be 50–60 %, but the water evaporates
in time until the wood reaches equilibrium. The density of treated wood in the end is one to two per-
cent higher compared to untreated wood. Impregnated products are mainly class NTR A or NTR AB.
Also, UC2 products are produced for UK market.
Impregnated timber is mainly made from the planed timber produced at Pölkky Oy’s production sites.
Also, a small portion of sawn timber is impregnated annually. Sawn timber is procured from Pölkky
Oy’s production facilities as well. Occasionally, a batch of raw material may come from a subcontrac-
tor. The treatment is carried out through pressure impregnation in a closed process, where all excess
preservatives are collected and reused in the next batch.
Planed timber procured from a subcontractor is modelled by the Finnish Sawmill association EPD
for the average planed timber in Finland (EPD of Finnish Sawn and planed timber 10.06.2021). Moisture content for impregnated timber right after the process can be 50–60 %, but the water evap-
orates in time until the wood reaches equilibrium. The density of treated wood in the end is 1–2 %
higher compared to untreated wood. The average density of impregnated timber in the modules A4-
A5, C and D is 490 kg/m³ in a moisture content of 20 %. |
