SPP Interior Birch

Technical characteristics:

• Humidity and application to BS EN 636: Class 2 - Interior conditions.

• Bonding class to EN 314-2.

• Moisture content to EN 315 and DIN 68705: 10% (±2%).

• Formaldehyde: In accordance with the standard EN 13986 the formaldehyde emission meets the Class E1 requirements (test method EN 717-2).

Material:

- Grade B:

The highest quality plywood slight discolouration permitted, no external defects pin knots permitted, maximum of three repair patches (plugs) per m².

- Grade BB:

• High-quality plywood.

• Predominantly unfilled and sanded veneer.

• All major defects replaced with wood patches.

• A restricted number of solid minor knots are admissible along with small, closed splits.

• Some brown stain permitted.

• Allow for colour variations.

- Grade C:

• The lowest grade plywood. Not sanded, open defects of wood structure and processing defects are allowed.

• For construction purposes when face grade is not important i.e. packaging.

- Grade CP:

• Discolouration and plugs are allowed without limits.

• Putty repairs.

• Larger defects.

- Grade WG:

• For use where surface appearance is not important, reverse grade.

• Sound knots permitted.

• Open splits and checks up to 4 mm wide. Discolouration, streaks, roughness, glue penetration and plugs permitted.

Thickness:

- Number of plies (laminations - 1.4 mm-thick veneers, cross bonded):

• 4 mm: 3-ply.

• 6.5 mm: 5-ply.

• 9 mm: 7-ply.

• 12 mm: 9-ply.

• 15 mm: 11-ply.

• 18 mm: 13-ply.