SPP Exterior Birch

Technical characteristics:

• Humidity and application to BS EN 636: Class 3 - Interior, humid and exterior conditions (Non-fire rated).

• Bonding class to EN 314-2: Class 3.

• 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) listed where applicable:

• 3 mm.

• 4 mm (3-ply).

• 6 mm.

• 6.5 mm (5-ply).

• 9 mm (7-ply).

• 12 mm (9-ply).

• 15 mm (11-ply).

• 18 mm (13-ply).

• 21 mm (15-ply).

• 24 mm (17-ply).

• 27 mm (19-ply).

• 30 mm (21-ply).

• 32 mm.

• 35 mm (25-ply).

• 40 mm (29-ply).

• 45 mm (33-ply).

• 50 mm (37-ply).