FSC 9310 JCP A55
HEAT-SET WEB OFFSET BOOK
Printing Paper February 1, 1999
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Use information: This paragraph is informational only and is not
exclusively definitive of the end use.
For simultaneous face and back, web offset printing of books,
pamphlets, catalogs, folders, circulars, etc., the 75 g/m\2\ or heavier
papers, may be used for solid reverses or heavy halftones. Printed
matter may include text, line illustrations and halftones up to 150-line
screen. Slitting and pasting and/or cross perforating are included in
press capabilities.
Stock: Groundwood pulp, not to exceed 1 pct. The total lignin content of
the paper shall not exceed 3 pct of the fiber weight.
Note: Not less than 30 pct postconsumer fiber. Any percent over 30
percentage points, is encouraged, provided that the requirements of
this Standard are met.
Acidity: pH value shall average not less than 6.5.
Grammage (g/m\2\).................... 60 75 90 105 120
Basis weight: 25 by 38 inches, 500 40 50 60 70 80
sheets (pounds)...................
A tolerance of 5 pct shall be allowed.
Bursting strength: Average, not less
than (kPa)......................... 90 100 120 150 170
Equivalent (lb/in\2\).............. 13 15 18 22 25
Opacity: Average, not less than
(percent).......................... 86 89 91 92 94
No individual specimen shall 84 87 89 90 92
average less than (percent).......
Thickness: Average (mm) ........................................... 0.075 0.100 0.120 0.140 0.160
Equivalent (inch)................................................ 0.0030 0.0039 0.0047 0.0055 0.0063
A tolerance of 0.013 mm (0.0005 inch) shall be allowed.
Paper shall be uniform and shall not vary more than 0.011 mm (0.0004
inch) from one edge to the other.
General appearance: Paper shall conform to the standard sample(s)
adopted by the Government.
Color: The paper in the order (or publication) shall be uniform with a
target brightness of 81 pct. The color variation shall not exceed
DE(CIELAB)=1.0.
Finish and formation: Shall be uniform.
Cleanliness: The dirt count for each side of the paper shall not
exceed 650 specks per square meter. No sample sheet (600 to 650 cm\2\
in size) shall contain more than one defect with an equivalent area of
0.25 mm\2\ or greater.
Sampling and testing: Shall be conducted in accordance with standards in
Part 2, Government Paper Specification Standards.
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Unless otherwise specified, the following is automatically waived when
printing or duplicating is to be accomplished on commercial contract
Sizing: Paper shall be surface- and internal-sized suitable for
satisfactory printing on both sides of the paper on high-speed heat-
set web offset presses equipped with continuous flow or brush
dampening systems.
Tensile strength: Average, not less than--
Machine direction (kN/m)........... 2.5 3.5 3.8 4.1 4.5
Cross direction (kN/m)............. 1.2 1.4 1.6 1.8 2.0
Equivalent--
Machine direction (kg/in).......... 6.4 9.0 9.7 10.5 11.5
Cross direction (kg/in)............ 3.1 3.6 4.1 4.6 5.1
Color: Shall match the Government's standard sample for color. A
deviation of DE(CIELAB)=0.5 from the color standard is allowed.
For information only, the CIELAB values (Ill D65, 10 deg. observer)
of the color standard are
L*=93.3
a*=1.0
b*=-2.0
Pick resistance: Average, each side, not less than 10-A Dennison wax
number.
No individual specimen shall average less than 8-A Dennison wax
number.
Surface: Shall be free from lint, fuzz, or any particles which will
pick, lift, fluff, or pile on the blanket under normal press
conditions.
Size and trim: Rolls: Roll width and diameter shall be as ordered. A
tolerance of 2 mm (\1/16\ inch) shall be allowed for width
and 26 mm (1 inch) for diameter.
Roll winding: Roll paper shall be tightly wound at even tension and
shall not contain more than the specified maximum number of splices
per roll. The number of splices permitted per roll is determined by
the roll diameter as ordered. On rolls 1,016 mm (40 inches) or less, a
maximum of three splices per roll shall be allowed. On rolls over
1,016 mm (40 inches), a maximum of four splices per roll shall be
allowed. Splices shall be neatly and securely overlap-pasted and made
with a repulpable adhesive which will not permit the splice to
separate while passing through a drying oven maintained at 200 deg.C.
The adhesive may be applied from a tape form backing, provided the
backing is removed, leaving only the adhesive component on the splice.
The adhesive shall not cause the splice to adhere to adjacent laps.
The tails of the splices shall be neatly and evenly removed without
damage to adjacent laps. Splices shall be flagged at both ends with
projecting colored markers, not pasted to the splice, or otherwise
clearly marked.
Pressroom conditions: The bulk of this paper will be used in air-
conditioned pressrooms maintained at 24 deg.C 2 deg.C
and 45 pct 8 pct relative humidity.