International Plywood Standards

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JPIC

JPIC

PLYWOOD FOR GENERAL USES
Standard of inspection, method of inspection, grades, standards of grades and methods of determining grades.
A.. Grading:

 
Item
Quality
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Knot (pin knot is excluded),bark pocket or pitch pocket Total number of knot, bark pocket and pitch pocket (Bark pocket and pitch pocket having 1/8 in. or less of maximum diameter are excluded) Total number shall not exceed a quotient resulted from dividing the surface area in sq.ft. by 5 sq.ft For China, the total number shall not exceed two multiples of above quotient. (If the quotient has any fraction, the quotient shall read as its integer plus ᾿᾿ Total number shall not exceed two multiples of a quotient resulted from dividing the surface area in sq.ft. For China, the total number shall not exceed three multiples of above quotient. (If the quotient has any fraction, the quotient shall read as its integer plus ᾿᾿ Not limited Not limited
Sound knot 1/2 in. or less of maximum diameter 3/4 in.or less of maximum diameter 2 in. or less of maximum diameter Not limited
Dead Knot 1/8 in. or less of maximum diameter 1/4 in. or less of maximum diameter 1/2 in. or less of maximum diameter 1᾿/2 in. or less of maximum diameter
Knot Hole 1/8 in. or less of maximum diameter and it shall be mended skillfully 1/4 in. or less of maximum diameter and it shall be mended skillfully 1/2 in. or less of maximum diameter and it shall be mended skillfully 1᾿/2 in. or less of maximum diameter
Bark Pocket or pitch pocket 1/4 in. or less of maximum diameter. Or 1/16 in. or less of width and 3/4 in. or less of length. 1/2 in. or less of maximum diameter. Or 1/8 in. or less of width and 3/4 in. or less of length. 3 in. or less of maximum diameter Not limited
Bark Pocket or pitch pocket 1/4 in. or less of maximum diameter. Or 1/16 in. or less of width and 3/4 in. or less of length. 1/2 in. or less of maximum diameter. Or 1/8 in. or less of width and 3/4 in. or less of length. 3 in. or less of maximum diameter Not limited
Pin Knot It shall not impair visiblely appearance. It shall not impair visiblely appearance so remarkably Not Limited Not Limited
Discoloration Very Slightly Slight Not conspicuous Not conspicuous
Split It shall be filled skillfully. 1/32 in. or less of width; and length shall not exceed 5 percent of the piece length It shall be filled skillfully. 1/16 in. or less of width; and length shall not exceed 10 percent of the piece length It shall be filled. 1/8 in. or less of width; and length shall not exceed 15 percent of the piece length 1/4 in. or less of width and length shall not exceed 20 percent of the piece length. But the filled one shall not exceed 1/2 in.of width and length of 25 percent of the piece length.
Cross break None None Length shall not exceed 10 percent of the piece width Length shall not exceed 20 percent of the piece width
Worm hole 1/16 in. or less of maximum diameter. Those shall be mended skillfully and shall not be clustered 1/8 in. or less of maximum diameter. Those shall be mended skillfully and shall not be clustered 1/4 in. or less of maximum diameter. Those shall be mended 3/4 in. or less of maximum diameter. Not limited for the mended ones
False Heartwood (Applicable only to Beech) Colors shall be well matched Colors shall be matched Not Limited Not Limited
Sound Burl Very Slight Slight Not Conspicuous Not Limited
Rough cut , Torn grain, Brashness 3 percent or less of the surface area, Very slight Do 5 percent or less of the surface area, slight 10 percent or less of the surface area, Not conspicuous
Shim Length shall not exceed 10 percent of the piece length, Colors and grains shall be matched. Gap is not acceptable Colors and grains shall be matched. Gap is not acceptable Colors shall be matched. Gap is not acceptable Not Limited
Joint Colors and grains shall be matched in conformity to the condition of joint. Gap is not acceptable. Joint running slatendicular shall not be conspicuous Colors and grains shall be matched in conformity to the condition of joint. Gap shall not exceed 1/64 in. of width and length of 10 percent of the piece length. It shall be mended skillfully. Joint running slatendicular shall be scarcely conspicuous Colors and grains shall be almost matched in conformity to the condition of joint. Gap shall not exceed 1/32 in. of width. It shall be mended. Joint running slatendicular shall be scarcely conspicuous. Gap shall not exceed 1/8 in. of width
Blister None None None None
Wrinkle None None None Slight
Flaw and depression None None Very slight Not conspicuous
Hole (worm hole is excluded) 1/16 in. or less of maximum diameter. It shall be mended skillfully 1/8 in. or less of maximum diameter. It shall be mended skillfully 1/4 in. or less of maximum diameter. It shall be mended 1᾿/2 in. or less of maximum diameter.
Finishing Good Finish Do Almost good finish Do
Insufficient removal of tape None Do Do Slight
Perforation and other process (Applicable only to the processed plywood) Good Finish Do Do Not Rough
Finishing of transparent coating which does not obscure the grain or texture.(Applicable only to plywood finished by transparent coating) Good Finish Do Do  
Other defects Very slight Slight Do Not limited

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