Specifications
for Card Stock, Buffered, for the Storage of Artifacts
Specification Number 200-200-6/19/02
This specification is provided as a public service by the Preservation
Directorate of the Library of Congress. Any commercial reproduction
that implies endorsement of a product, service or materials, in any
publication, is strictly prohibited by law. This Specification is written
for L.C. purchasing purposes and is subject to change when necessary.
I. General Specifications - II.
Product Requirements - III. Inspection
A. Stock Composition
- Pulp:
- Fiber: The stock should be made from rag or
other high alpha-cellulose content pulp. It must not contain any
post consumer waste recycled pulp.
- Lignin: The stock must give a negative reading
for lignin as determined by the phloroglucinol test when tested
according to ASTM D 1030, X5 spot stains and shall have a Kappa
number of 5 or less when tested according to TAPPI T 236 cm-85.
- Impurities: The stock must be free of metal
particles, waxes, plasticizers, residual bleach, peroxide, sulfur
(which will be less than 0.0008% reducible sulfur as determined
by TAPPI T 406 om-88), and other components that could lead to
the degradation of the paper and artifacts stored therein.
- Metallic Impurities: Iron must not exceed 150
ppm and copper shall not exceed 6 ppm when test according to TAPPI
T 266.
- Optical Brighteners: The stock must be free
of optical brightening agents.
- pH:
The stock should have a pH value within a range of 8.0 - 9.5 as determined
by TAPPI T 509 om-88, cold extraction (modified by slurrying sample
pulp before measurement).
- Alkaline Reserve:
The alkaline reserve should be a minimum of 2% and a maximum of 5%
calculated as CaCO3when tested according to ASTM 4988-89.
- Sizing:
Only neutral or alkaline sizing shall be used. No alum rosin or rosin
sizing should be used as determined by ASTM D 549-88.
- Photographic Activity Test:
The stock must pass the Photographic Activity Test (P.A.T.). Tests
to be conducted and results reported as described in ISO 14523-1999,
or latest revision. Tests should be performed by Image Permanence
Institute (c/o Rochester Institute of Technology, Frank E. Gannett
Memorial Building, P.O. Box 9887, Rochester, NY 14623-0887, Tel: 716-475-5199,
FAX: 716-475-7230) or other pre-approved laboratory.
- Thickness and Basis Weight:
- 10 pt. card: the minimum basis weight should
be 145 lbs/3,000ft.2
- 20 pt. card the minimum basis weight should
be 250 lbs/3,000ft.2
- Folding Endurance:
The stock must meet the minimum requirement of 750 double folds in
the machine direction using a 1 kg. load. Tests to be conducted according
to the MIT Fold Endurance Test as described by TAPPI T 511 om-88,
after conditioning according to TAPPI T 402 om-88.
- Color:
- The color of the stock will normally be tan, cream, buff or
will be specified on the purchase order. The color must not be
so dark that it obscures color-dependent test evaluations.
- Bleeding: The color must show no bleeding when
soaked in distilled water for 48 hours while held under suitable
weight in contact with white bond paper. The color must not rub
off.
- Retention: The color of the stock must not
change more than 5 points of brightness as measured by directional
reflectance at 457 nm (TAPPI T 452 om-92), when exposed 24 hours
to a Xenon arc lamp in an Atlas Weatherometer under the following
conditions: Irradiance Level: 1.0 watts/m2 at 420 nm. Inner
filter: Borosilicate glass. Outer filter: clear soda lime glass.
Black panel temperature: 50°C. Wet bulb depression: 8.5°C.
- Surfaces and Smoothness:
The surfaces of the stock must be free of fingerprints, dirt, bubbles,
knots, shives and other abrasive particles. The stock is to be smooth,
e.g., calendered, hot-rolled, and/or water polished. The stock must
show a smoothness within the range of 175 to 220 Sheffield units,
when tested according to TAPPI 538 om-88.
- Creases of Folds:
The stock should not fray, crack or split when folded and/or creased.
- Abrasion:
The outer surfaces of the stock must show a loss of less than 2% of
the total weight (mounting card and sample) when tested with a #CS10
wheel and 100 wear cycles according to TAPPI T 476 om-84.
- Stiffness:
Stiffness will be evaluated according to TAPPI 489 om-86, after conditioning
by TAPPI method T 402 om-88.
- 10 pt. card must have a minimum internal stiffness
of 80 Taber units in the machine direction and 30 in the cross
direction.
- 20 pt. card must have a minimum internal stiffness
of 380 Taber units in the machine direction and 160 in the cross
direction.
Values less the required minimum willl be considered a failure.
- Adhesive:
If an adhesive is required, it must not soften, run, cause the stock
to become transparent or alter the color of the stock. The adhesive
must not yellow, discolor, or fail (causing delamination) over time.
When used, the adhesive must not extend beyond the joined area.
- Planar Distortion:
There must be minimal planar distortion upon visual inspection.
B. Workmanship
Edges will be cut square and clean, and sizes accurate.
C. Identification
There should be no identification marks on the card stock unless
otherwise specified.
D. Packaging
- Inner Wrapper:
I.D.: Each package must plainly identify the type,
size and number of items within, the name of the supplier or manufacturer,
year of manufacture, manufacturing run or batch number, actual pH
(± 0.2 pH) and "P.A.T.".
- Outer Wrapper: The items must be packed in standard
commercial containers which are constructed to ensure that they arrive
at the Library of Congress in dry, undamaged condition.
I.D.: The outside of each container must be identified
by type, size and number of items within, manufacturing run or batch
number, Purchase Order or Contract number and "P.A.T.".
E. Testing
- Responsibility:
The supplier is responsible for meeting all the requirements specified
herein. The Library of Congress has the right to perform any of the
tests set forth in the specification where such tests are deemed necessary
to ensure that supplies conform to prescribed requirements.
- Sampling:
To sample for testing, shipments will be sampled according to MIL-STD-105E
at inspection level S-2 with an acceptable quality level of 2.5 percent
defective from each lot offered. Copies of MIL-STD-105E are available
from Naval Publications and Forms Center, Standardization Document
Order Department, Building 4, Section D, 700 Robbins Avenue, Philadelphia,
PA 1911-5094.
- Methods:
Tests will be conducted in accordance with specified test methods
of the American National Standards Institute (ANSI), the American
Society for Testing and Materials (ASTM), and the Technical Association
of the Pulp and Paper Industry (TAPPI). Publications describing these
tests may be ordered directly from the technical associations at the
following address:
- ANSI, 1430 Broadway, New York, NY 10018
- ASTM, 1916 Race Street, Philadelphia, PA 19103
- TAPPI, One Dunwoody Park, Atlanta, GA 30348
- Tests:
Requirements
|
Test Method |
Lignin: |
negative/Kappa 5 |
ASTM D 1030, X5 or TAPPI 236 cm-85 |
Reducible Sulfur: |
< 0.0008% |
TAPPI T 406 om-88 |
Iron: |
< 150 ppm |
TAPPI T266 |
Copper: |
< 6 ppm |
TAPPI T266 |
pH: |
8.0 - 9.5 pH |
TAPPI T 509 om-88. cold extraction, slurried pulp |
Alkaline Reserve: |
2 - 5% |
ASTM D 4988-89 |
Alum Rosin Sizing: |
negative. |
ASTM D 549-88 |
"P.A.T.": |
negative |
ISO 14523-1999 or latest revision |
Basis Weight: |
10 pt: 145 lbs./3,000 ft2
20 pt: 250 lbs./3,000 ft2 |
TAPPI 410 om-93 |
Folding Endurance: |
750 MD |
TAPPI T 511 om-88, and TAPPI T 402 om-88 |
Color Bleeding: |
none |
See above, "I. 8. Color" |
Color Retention: |
< 5 points |
TAPPI T 452 om-92 |
Smoothness: |
175-220 Sheffield |
TAPPI 538 om-88 |
Abrasion: |
< 2% |
TAPPI 476 om-84 |
Stiffness: |
10 pt: 80 MD/30 CD Taber units
20 pt: 380 MD/160 CD Taber units |
TAPPI 489 om-86 |
F. Quality Assurance Inspection
- Sampling:
To evaluate non-tested requirements, shipments will be sampled according
to MIL-STD-105E at inspection level S-2 with an acceptable quality
level of 4.0 percent defective from each lot offered.
There are no additional product requirements.
An examination will be made to determine whether the items comply
with all requirements. The qualities and characteristics which will
be examined include the following.
Testing Inspection
- Materials must pass all composition and performance specifications
stated in "I. General Specifications."
Visual Inspection
- Color must be tan, cream or buff or as specified on the purchase
order or Contract.
- Edges or creases of the card must not fray, crack, or split.
- Edges must be cut square and clean and sizes accurate.
- Surfaces must be free of fingerprints, dirt, knots, shives and other
abrasive particles.
- Adhesives must not soften or run, nor cause the stock to become
transparent or alter the color of the stock. The adhesive must not
yellow or discolor, fail (causing delamination), or extend beyond
the joined area.
- Planar distortion should be minimal.
- Identification markings should not appear on the card stock unless
otherwise specified.
- The inner wrapper must be according to size and identified as specified
in "I. D. Packaging"
- The outer wrapper must ensure arrival in dry, undamaged condition
and be identified as specified in "I.D. Packaging."
FAILURE TO MEET ANY OF THE SPECIFICATIONS WILL BE CAUSE FOR REJECTION.