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ANSI/HPVA HP-1-2009 Standards©

ANSI/HPVA HP-1-2009 © 2009 By the Hardwood Plywood and Veneer Association

ASH, BIRCH, MAPLE AND POPLAR: ROTARY-CUT, QUARTER CUT, PLAIN SLICED (From Table 3.1©)
Natural Characteristics A Grade B Grade C Grade
Small Conspicuous Burls & Pin Knots – Comb. Avg. Number 10 per 4 x 8′ panel 16 per 4 x 8′ panel No limit
Conspicuous Burls – Max. Size 3/8″ 1/2″ No limit
Conspicuous Pin KnotsAverage NumberMax. Size: Dark PartMax. Size: Total 1 per 8 sq ft4 per 4 x 8′ panel1/8″1/4″ 1 per 4 sq ft8 per 4 x 8′ panel1/8″1/4″ No limit
Scattered Sound and Repaired KnotsComb. Average NumberMax. Size – SoundMax. Size – RepairedAvg. Number – Repaired No 1 per 8 sq ft4 per 4 x 8′ panel3/8″1/8″1 per 8 sq ft 1 per 4 sq ft8 per 4 x 8′ panel1/2″1/2″1 per 8 sq ft
Mineral Streaks Slight Slight Yes
Bark Pockets No Few to 1/8″ x 1″ Few to 1/4″ x 2″
Worm Tracks Slight Slight; Ash Yes Yes
Vine Marks Slight Slight Yes
Cross Bars Slight Yes Yes
MAHOGANY, ANIGRE AND SAPELE: ROTARY-CUT, QUARTER CUT, PLAIN SLICED (From Table 3.2©)
Natural Characteristics AA Grade A Grade B Grade
Small Conspicuous Burls & Pin Knots – Comb. Avg. Number 6 per 4 x 8′ panel 10 per 4 x 8′ panel 16 per 4 x 8′ panel
Conspicuous Burls – Max. Size 1/4: 3/8″ 1/2″
Conspicuous Pin KnotsAverage NumberMax. Size: Dark PartMax. Size: Total No 1 per 8 sq ft4 per 4 x 8′ panel1/8″1/4″ 1 per 4 sq ft8 per 4 x 8′ panel1/8″1/4″
Scattered Sound and Repaired KnotsComb. Average NumberMax. Size – SoundMax. Size – RepairedAvg. Number – Repaired No No 1 per 8 sq ft4 per 4 x 8′ panel3/8″1/8″1 per 8 sq ft
Mineral Streaks No Slight Occasional
Bark Pockets No No Few to 1/8″
Worm Tracks No No Slight
Vine Marks Slight Slight Yes
Cross Bars Occasional Occasional Yes
RED AND WHITE OAK: ROTARY-CUT, QUARTER CUT, PLAIN SLICED (From Table 3.3©)
Natural Characteristics A Grade B Grade C Grade
Small Conspicuous Burls & Pin Knots – Comb. Avg. Number 12 per 4 x 8′ panel 24 per 4 x 8′ panel No limit
Conspicuous Burls – Max. Size 3/8″ 1/2″ No limit
Conspicuous Pin KnotsAverage NumberMax. Size: Dark PartMax. Size: Total 1 per 3 sq ft10 per 4 x 8′ panel1/8″1/4″ 1 per 2 sq ft16 per 4 x8′ panel1/8″1/4″ No limit
Scattered Sound and Repaired KnotsComb. Average NumberMax. Size – SoundMax. Size – RepairedAvg. Number – Repaired No 1 per 8 sq ft4 per 4 x 8′ panel3/8″1/8″1 per 8 sq ft 1 per 4 sq ft8 per 4 x 8′ panel1/2″1/2″1 per 8 sq ft
Mineral Streaks Slight, Blending Few to 12″ Yes
Bark Pockets No Few to 1/8″ x 1″ Few to 1/4″ x 2″
Worm Tracks No Slight Few
Vine Marks Slight Yes Yes
Cross Bars Slight Yes Yes
HICKORY: ROTARY-CUT, QUARTER CUT, PLAIN SLICED (From Table 3.4©)
Natural Characteristics A Grade B Grade As agreed upon between buyer and seller
Small Conspicuous Burls & Pin Knots – Comb. Avg. Number 64 per 4 x 8′ panel No Limit
Conspicuous Burls – Max. Size 3/8″ 1/2″
Conspicuous Pin KnotsAverage NumberMax. Size: Dark PartMax. Size: Total 2 per 1 sq ft64 per 4 x 8′ panel1/8″1/4″ No Limit1/8″1/4″
Scattered Sound and Repaired KnotsComb. Average NumberMax. Size – SoundMax. Size – RepairedAvg. Number – Repaired No 1 per 8 sq ft4 per 4 x 8′ panel3/8″1/8″1 per 8 sq ft
Mineral Streaks Slight Yes
Bark Pockets Small, Occasional Few to 1/4″ x 2″
Worm Tracks Slight Few
Vine Marks Occasional Yes
Cross Bars Occasional Yes
Bird Peck Slight Yes
Knife Marks Knife marks may occur in these high density species
WALNUT AND CHERRY: PLAIN SLICED, QUARTER CUT, ROTARY CUT (From Table 3.5©)
Natural Characteristics A Grade B Grade C Grade
Small Conspicuous Burls & Pin Knots – Comb. Avg. Number 24 per 4 x 8′ panel 64 per 4 x 8′ panel No Limit
Conspicuous Burls – Max. Size 3/8″ 1/2″ No Limit
Conspicuous Pin KnotsAverage NumberMax. Size: Dark PartMax. Size: Total 1 per 2 sq ft16 per 4 x 8′ panel1/8″1/4″ 1 per 2 sq ft32 per 4 x 8′ panel1/8″1/4″ No Limit
Scattered Sound and Repaired KnotsComb. Average NumberMax. Size – SoundMax. Size – RepairedAvg. Number – Repaired No 1 per 8 sq ft4 per 4 x 8′ panel3/8″1/8″1 per 8 sq ft 1 per 4 sq ft8 per 4 x 8′ panel1/2″1/2″1 per 8 sq ft
Mineral Streaks Slight Yes Yes
Bark Pockets No Few to 1/8″ x 1″ Few to 1/4″ x 2″
Worm Tracks No Slight Few
Vine Marks Occasional Yes Yes
Cross Bars Occasional Yes Yes
Gum Spots Occasional gum spots in Cherry Gum spots and gum streaks in Cherry
BACK GRADES (From Table 6©)
Grade Description 1 Back 2 Back 3 Back 4 Back
Sapwood Yes Yes Yes Yes
Discoloration & Stain Yes Yes Yes Yes
Mineral Streaks Yes Yes Yes Yes
Sound Tight Burls Yes Yes Yes Yes
Sound Tight Knots Max. diameter 3/8″ Max. diameter 3/4″ Max. diameter 1 1/2″ Yes
Max. Number of Tight Knots 16 16 Unlimited to 1/2″;No more than 16 from 1/2″ to 1 1/2″ Unlimited
Knotholes No 1/2″ repaired 1″ 4″
Max. Combined Number of Knotholes and Repaired Knots None All repaired;Unlimited to 3/8″;No more than 8 from 3/8″ to 1/2″ Unlimited to 3/8″;No more than 10 from 3/8″ to 1″ Unlimited
Wormholes Filled Filled Yes Yes
Splits or Open Joints Six 1/8″ x 12″ repaired Six 3/16″ x 12″ repaired Yes, 3/8″ x 1/4″Length of Panel (LOP) 1″ to 1/4 LOP1/2″ to 1/2 LOP1/4″ to Full LOP
Doze & Decay Firm areas of doze Firm areas of doze Firm areas of doze Areas of doze and decay provided serviceability of panel is not impaired
Rough Cut/Ruptured Grain Two 8″ diameter areas 5% of panel Yes Yes
Bark Pockets 1/8″ wide repaired 1/4″ wide repaired Yes Yes
Laps No Repaired Yes Yes
CORE GRADES (From Table 7©)
Grade Description J Grade K Grade L Grade M Grade
Thickness of Crossband Adjacent to Faces Any Thickness Thicker than 1/10″ 1/10″ and thinner Any thickness Any thickness
Knotholes and Other Round Elliptical Openings (Max. Diameter) None 3/8″ 3/4″ 1″ 2 1/2″
Splits, Gaps, and Other Elongated End or Edge Openings – Visible on only one end or edge of panel (Max. Width) 1/8″ 1/4″ 1/2″ 1″
LIMITING CRITERIA FOR PLYWOOD (From Table 8©)
Limiting Factors TYPE 1 (EXTERIOR) TYPE 2 (INTERIOR)
Bond Line Requirements Fully waterproof Water resistant
Bond Line (glue bond) Test Performance Dry and cyclic-boil shear Three-cycle soak and dry
Grade and Limitations of Inner Piles Adjacent to Faces* K K under AA, A or BL under C, D or E
Grade of Other Inner Piles M or better M or better
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