8.06.2017

I. Quality requirements - mechanical working:

  • Lamel's width 40-45 mm (or 18-20mm)
  • Sanding granulation 80-120
  • Right angle aberration 1 mm for each 1000 mm
  • Warping 5 mm for each 1000 mm
  • Humidity of the timber 8% ± 2%
  • Dimensional tolerance  -1 + 3 mm length,
    -1 +3 mm width,
    ± 0,3 mm thickness
  • Packing single use pallets, protected corners, wrapped with foil and fastened together with belt

Classes - quality requirements:

Class A

  • Sound knots, tight, light in color diameter up to 5 mm
  • Black, full knots, tight diameter up to 3 mm
  • Spots of up to 1 x 50 mm
  • Strips matched according to the color
  • Any other wood defect which is not mentioned to be excluded

Class B

  • Sound knots, tight, light in color  - acceptable
  • Black, full knots, tight diameter up to 8 mm
  • False heartwood acceptable up to 1/4 strip's width
  • Spots and sagging up to 3 x 100 mm  - acceptable
  • Spacer marks non numerous acceptable - as less visible
  • Putty repairs acceptable as "lens-shaped" or "cork-shaped" diameter up to 20 mm
  • Strip matching according to the color less precise than in the case of Class A
  • Any other wood defect which is not mentioned to be excluded

Class C

  • Sound knots, tight, light in color  - acceptable
  • Black, tight and decay knots  - acceptable
  • False heartwood  - acceptable
  • Spots, sagging, dye penetrations  - acceptable
  • Spacer marks  - acceptable
  • Putty repairs  - acceptable
  • Strip matching according to the color  - optional