ISO 287:1978
(Main)Paper and board — Determination of moisture content — Oven-drying method
Paper and board — Determination of moisture content — Oven-drying method
Papier et carton — Détermination de l'humidité — Méthode par séchage à l'étuve
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INTERNATIONAL STANDARD 287
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INTERNATIONAL ORGANIZATION FOR STANOARDIZATlON*MEWYHAPOnHAR OPTAHH3AUWR il0 CTAH~AFïi+3AUHH.ORGANISATlON INTERNATIONALE DE NORMALISATION
Paper and board - Determination of moisture content -
Oven-drying method
Papier et carton - Détermination de l'humidité - Méthode par séchage à l'étuve
First edition - 1978-10-01
UDC 676.3/.7 : 543.812
Ref. No. IS0 287-1978 (E)
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Descriptors : papers, paperboards, chemical analysis, determination of content, water, humidity, drying.
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Price based on 3 pages
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INTERNATIONAL STANDARD IS0 287-1978 (E)
Paper and board - Determination of moisture content -
Oven-drying method
1 SCOPE AND FIELD OF APPLICATION 5.3 Oven, capable of maintaining the air temperature at
105 I2 OC, and suitably ventilated to maintain uniform
This International Standard specifies an oven-drying
temperature in the usable volume whilst extracting the
method for the determination of the moisture content
moisture driven off the paper.
of paper and board at the time of sampling.
The method is applicable to all paper and board, including
6 PREPARATION OF CONTAINERS
corrugated fibreboard and solid fibreboard, provided that
the paper or board does not contain any substance, other
Before sampling, a sufficient number of clean, dry
than water, that will escape at the temperature specified
containers shall be numbered and allowed to attain
for the test.
temperature equilibrium with the atmosphere. Each
container shall then be weighed and kept closed until the
sample is about to be taken.
2 REFERENCE
IS0 186, Paper and board - Sampling for testing.
7 SAMPLING
The units to be sampled shall be selected in accordance
3 DEFINITIONS
with IS0 186.
For the purpose of this International Standard, the
NOTE - If the atmosphere at the place of sampling is warm and
following definitions apply.
damp, precautions shall be teken in handling the paper or board to
avoid contamination and any gain or loss of moisture. In particular,
it is recommended that rubber gloves be worn; to avoid moisture
3.1 moisture content : The amount of water in a paper
changes due to atmospheric exposure, it is important also to enclose
or board. In practice, it is regarded as the ratio of the loss
all test pieces in their containers immediately after taking tham.
of mass of a test piece when dried according to the standard
method of test to its mass at the time of sampling; it is
8 SELECTION, PREPARATION AND WEIGHING OF
normally expressed as a percentage.
TEST PIECES
3.2 constant mass : The mass reached by a test piece of
8.1 When the unit is a ream or parcel
paper or board after drying at the specified temperature
until the difference between two successive weighings does
8.1.1 Determination of the average value of moisture
not exceed 0,l % of the initial mass of the test piece.
content in the lot
a) For a paper or board of a grammage less than or
4 PRINCIPLE
equal to 224 g/m2
Weighing of the test piece at the time of sampling, and
From the centre of each ream or parcel, take at least
again after drying to constant mass.
four consecutive sheets; quickly fold or cut them and
enclose them together in one of the containers. The
contents of a container constitute a test piece, which
5 APPARATUS
shall have a mass of at least 50 g. Weigh the container
5.1 Balance, having an accuracy of 0,05 % of the mass to with its contents and calculate the mass of the test
be weighed, or better. piece.
b) Fo
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