BB/CC Face Grade – Regular Lumber Core Grade – Sound Sanded Back Grade

Product Name	Block Board
Grade	BB/CC – RLC - SSB
Face & Back Veneer	Okoume(0.35mm up) / Bintangor(0.3mm up)
Lumber Core	Paulownia / Pine / Falcatar
Glue Type	Type I WBP (Water Boiling Proof) Type II MR (Moisture Resistance)
Thickness	12mm / 15mm / 18mm
Size(mm)	1200 x 2400 / 1220 x 2440 / 1250 x 2500

BB/CC Grade for Face (Okoume)

Live Knots	25.4mm max. diam
Dead Knots	None for BB, Well puttied & color matched for CC
Knotholes	12.7mm max. diam. Puttied & color matched
Burls	Yes, Smooth
Color Variation	Very Slight
Stain & Mineral Streak	None for BB, Blending for CC
Dry Pitch & Bark Pockets	Well puttied & Color matched
Wormholes, Pinholes	11 per 1M2, 32 per 1220 x 2440. 1.6mm max. diam, Puttied
Worm tracks	Filled linear hole 15.9mm max. well puttied
Vane Marks	Blending, Smooth
Cross Breaks	No, Hairline 50.8mm max. length
Doze	Firm, Slight, well Puttied, Blending

Regular Lumber Core

Voids	Max. 1.0mm, Over 1.0mm Shim repaired
Edge Core Strips	Min. 15mm wide, Min. 1 finger joint
Width of Core Strips	Max. 45mm
Length of Core Strips	Min. 150mm or 6 Pcs in row
Grain of Core Strips	Not mixed

Laps	No
Voids	Three Max. 3.2mm x 102mm, Not visible on face
End Splits	Yes, Not visible on the face
Uneven Core Thickness	No

Boat, large symmetrical patches, bark, open bark pockets, wet pitch, grease/oil, colored chalk, surface with corrugated, wrinkled, delaminated, press marks and other mechanical defects are not allowed on both sides of Cross Band

Wood Strips shall be free of knots or other defects. Discoloration, Patches, Plugs and fillers in minority are allowed except puttied defects.

SSB Grade for Back Face (Okoume)

Live Knots	25.4mm Max. Diam
Dead Knots	None for BB, Well puttied & color matched for CC
Knotholes	12.7mm Max. Diam. Puttied & color matched
Burls	Yes, Smooth
Color Variation	Very Slight
Stain & Mineral Streak	None for BB, Blending for CC
Dry Pitch & Bark Pockets	Well puttied & Color matched
Wormholes, Pinholes	11 per 1M2, 32 per 1220 x 2440. 1.6mm max. diam, Puttied
Worm tracks	Filled linear hole 15.9mm Max. well puttied
Vane Marks	Blending, Smooth
Cross Breaks	No, Hairline 50.8mm Max. length
Doze	Firm, Slight, well Puttied, Blending

Manufacturing Standard

Items	Both BB/CC Face & Sound Sanded Back
Joint	Not allowed
Wrinkles & Corrugation	Not allowed.
De-lamination	Not allowed
Open Splits	Hair line, 302mm Max. on Panel Ends Only
Filled or Puttied Splits	At each ends only, Color Matched
Fill & Putty Smear	Color Matched
Rough Cut& Ruptured Grain	Sanded, Smooth
Knife Marks	No
Tape & Glue Residue	No
Sanding	Both Sanded

Physical Standard

Moisture Contents	Less than 12%
Adhesion	Type I : 4 hrs in boiling & 20 hrs drying at 60°C, 4 hrs in boiling again Type II : 2 hrs boiling & 3 hrs drying at 60°C, Both Min. 0.7 N/mm2
Thickness Tolerance	±0.5mm
Allowance in Width & Length	±2.0mm
Diagonal Allowance	Max. 3.0mm
Warp	0.1% (1.22mm against 1220mm width, 2.44mm against 2440mm length)