FSC 3610 JCP O-50
MASKING, PHOTOLITHOGRAPHIC (COATED)
Miscellaneous Paper February 1, 1999
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Use information: This paragraph is informational only and is not
exclusively definitive of the end use.
This paper is used for the photographic masking process and for face
and back offset printing.
Stock: Free from groundwood or unbleached pulp.
Note: \1\ Postconsumer fiber, in any percentage, is encouraged,
provided that the requirements of this Standard are met.
Equilibrium relative humidity: Shall be 45 pct 8 pct at 23
deg.C 2 deg.C.
Grammage (g/m\2\)................................. 120
Basis weight: 25 by 38 inches, 500 sheets
(pounds).......................................... 80
A tolerance of 5 pct shall be
allowed.
Bursting strength: Average, not less than (kPa)... 140
Equivalent (lb/in\2\)........................... 21
Coating: Shall be uniformly applied; shall not be gritty, mottled,
stippled, or ribbed in appearance; shall not crack or flake off.
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 and
match the goldenrod standard. The color variation shall not exceed
DE(CIELAB)=1.0. The CIELAB values (Ill D65, 10 deg. observer) of the
color standard are
L*=78.0 to 82.0
a*=9.5 to 13.5
b*=67.0 to 71.0
Light transmission: Shall not exceed 0.1 pct at wavelengths below 540
nanometers and 4.5 pct at wavelengths from 540 to 700 nanometers, as
measured spectrophotometrically.
Finish and formation: Shall be uniform.
Cleanliness: The dirt count for each side of the paper shall not
exceed 50 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
Curl: Paper shall lie flat with either no tendency to curl or with a
curl which can be overcome under reasonable working conditions.
Surface: Shall be uniform, free from mottle, and any particles which
will pick, lift, fluff, or pile on the blanket under normal press
conditions.
Size and trim: Sheets: Paper shall be furnished in the size(s) ordered
and shall be flat, trimmed square on four sides with clean smooth
edges, and evenly jogged. A tolerance of 2 mm (\1/16\
inch) shall be allowed except for sheets 216 by 356 mm (8\1/2\ by 14
inches) or less; then a tolerance of 1 mm (\1/32\ inch)
shall be allowed. Successive sheets within any package shall not
differ from each other by more than 0.5 mm (\1/64\ inch). Paper with
the long dimension 813 mm (32 inches) or less shall be considered
square if the variation does not exceed 1 mm (\1/32\ inch); over
813 mm (32 inches), 2 mm (\1/16\ inch).
Grain: Direction of the grain on flat paper shall be as ordered.
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\1\ This grade is typically a low Government usage paper and
currently not readily and/or economically available with postconsumer
fiber content.