Specification

Page 2 of 2 2020-11-23
3.1. Characteristics of grade
Classification according to EN 13489: Free class
Knots
healthy, integrated ≤ 8 mm;
black, unsound (filled with beige putty. May be covered with light grey color) ≤ 4 mm
unfilled knots (brushing effect) acceptable up to 3 mm
Sapwood
unacceptable
Surface splits, non
penetrating
unacceptable
Bark pockets
unacceptable
Lightning shake
unacceptable
Slope of grain / curly
grain
acceptable
Heart of tree
acceptable
Colour variation
acceptable
Medullary rays
acceptable
Sticker marks
unacceptable
Biodegradation
unacceptable
According to EN 13489, 3% of the strips in a batch may be from other classes
4. Product characteristic
Lipping
(between elements) [mm]
≤ 0,2
Deviation of rectangularity
(on the item width) [mm]
≤ 0,36
Crosswise warping
(across the item) [mm]
≤ 0,36
Spring (along the element)
[mm]
≤ 2,19
Moisture content [%]
7 +/- 2
4.1. Finishing surface
Slipperiness
USRV 46
Adhesion to wood SC3
Grindability min 100 (Taber method, S-42)
4.2. Physical and chemical properties
Reaction to fire
D
fl
– s1
Emission of formaldehyde E1
Content of
pentachlorophenol
NPD
Thermal conductivity 0,11 W/mK
Biological durability class 1
5. Product marking: CE