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Nannup Timber Processing - Grading Characteristics
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| SUMMARY
FOR PERMISSIBLE CHARACTERISTICS FOR SEASONED HARDWOODS |
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CHARACTERISTICS
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PRIME GRADE
GRADED ON BEST FACE/TWO (2) EDGES |
STANDARD GRADE
GRADED ON ALL FOUR (4) SURFACES |
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BORER HOLES
(Clean Edged) |
Permitted provided not exceeding 5mm in dia. and
not
more than two (2) within any 0.9 metre of length. |
Permitted provided not exceeding 12mm in dia.
and not
more than two (2) within any 0.9 metre of length. |
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BORER CANALS
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Not permitted.
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Permitted provided not exceeding 12mm in width
by 50mm in
length and not more than one (1) within any 0.9 metre of length. |
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PIN HOLES
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Permitted provided not exceeding 2mm in dia.,
isolated and not
more than six (6) within any 0.9 metre of length. |
Permitted provided not exceeding 3mm dia. and
not more
than ten (10) within any 0.9 metre of length. |
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KNOTS
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Permitted provided sound and intergrown, not exceeding
25% of the width of the surface on which they occur with associated voids not exceeding 5mm in dia. and not more than one (1) within any 0.9 metre of length. |
Permitted provided sound and intergrown not exceeding
1/3rd of the width of the surface on which they occur with associated voids not exceeding 12mm in dia. and not more than three (3) within any 0.9 metre length. |
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KNOT HOLES
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Not permitted.
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Permitted provided not exceeding 12mm dia. and
not more
than two (2) within any 0.9 metre of length. |
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GUM VEINS - TIGHT
(Bridged with Wood Fibre) |
Permitted provided not exceeding 2mm in width
and individually
and in aggregate not exceeding 400mm in any 0.9 metre of length. |
No limitations.
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GUM VEINS - LOOSE
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Not permitted.
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Permitted provided not exceeding 3mm in width,
confined
to one surface only and individually and in aggregate not exceeding 400mm within any 0.9 metre of length. |
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GUM POCKETS
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Not permitted.
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Permitted provided not exceeding 10mm in width
by
150mm in length, not intersecting an end and not more than one (1) within any 0.9 metre of length. |
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GUM STREAKS, SMEARS, SPLASHES
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Permitted provided not exceeding 2mm in depth
and in area
not to exceed 50mm x 25mm or equivalent. |
Permitted provided bridged with wood fibre and
sound.
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OVERGROWTHS OF INJURY AND
KNOT OCCLUSIONS |
Permitted provided sound and intergrown, not exceeding
25% of the width of the surface on which they occur with associated voids not exceeding 5mm in dia. and not more than one (1) within any 0.9 metre of length. |
Permitted provided sound and intergrown, not exceeding
1/3rd of the width of the surface on which they occur with associated voids not exceeding 12mm in dia, and not more than three (3) within any 0.9 metre of length. |
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BIRDSEYES
(Epicormics) |
Singular and/or in clusters permitted provided
individual openings
do not exceed 1.5mm in width and do not extend beyond 50% of the length of the characteristic. |
No limitations.
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WANT AND WANE
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Permitted provided able to be removed by final
machining
to industry dimensions. |
Permitted provided not exceeding 25mm measured
across the
bevel of one (1) arris and in aggregate not exceeding 1/3rd of the length of the piece. |
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SURFACE SEASONING CHECKS
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Fine, hairline checks permitted provided individually
not
exceeding 75mm in length and in aggregate not exceeding 10% of the length of the piece. |
Permitted provided individually not exceeding
2mm
in width by 200mm in length. |
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COMBINATION OF CHARACTERISTICS
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Permitted provided a combination of not more than
two (2)
characteristics and not more than one (1) combination within any 0.9 metre of length. |
Permitted provided a combination of not more than
three (3) characteristics of maximum permissible size within any 0.9 metre of length. |
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SAPWOOD
(Non-susceptible) |
No limitations.
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No limitations.
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BLACK SPECK, SPOTS, FLECK
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No limitations.
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No limitations.
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BURLS, FEATURE GRAINS
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No limitations.
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No limitations.
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NATURAL COLOUR VARIATIONS/STAINS
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Permitted provided not associated with decay.
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Permitted provided not associated with decay.
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SLOPE OF GRAIN
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Not limited for the purpose of this grade, however
for structural
applications refer to Australian Standard 2082-1979. |
Not limited for the purpose of this grade, however
for
structural applications refer to Australian Standard 2082-1979. |
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CUPPING/TWIST
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Permitted provided able to be removed by final
machining to
industry dimensions. |
Permitted provided able to be removed by final
machining
to industry dimensions. |
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BOW/SPRING
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Permitted provided able to meet permissible allowances
within milled product specifications. |
Permitted provided able to meet permissible allowances
within milled product specifications. |
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In addition to the non-permissible characteristics
listed in the above mentioned summary,
the following imperfections shall not be permitted in the individual grades of Prime and Standard: |
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a. #Compression failures other fractures
b. #Falling or cross shakes c. #Heart and associated shakes |
d. #End splits within the ordered length
e. #Internal seasoning checks f. #Loose unsound and defective knots |
g. #Included bark
h. #Decay i. #Termite galleries |
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Extract from: Industry Standard
For Seasoned, Sawn and Skip Dressed Western Australian Hardwoods*,
July 1992(Amended June 1997), Forest Industries Federation Western Australia (FIFWA) |
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