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Ref. No. : ISO/R 821-1968 (E)
1.
I.
IS0
I N T ERN AT1 O N A L ORGAN IZ AT1 O N FOR STA N DAR DI ZATlO N
I SO R ECO M M EN DATI O N
R 821
PARTICLE BOARDS
DETERM NAT ON OF DIMENSIONS OF TEST P
ECES
1st EDITION
September 1968
COPYRIGHT RESERVED
The copyright of IS0 Recommendations and IS0 Standards
belongs to IS0 Member Bodies. Reproduction of these
documents, in any country, may be authorized therefore only
by the national standards organization of that country, being
a member of ISO.
For each individual country the only valid standard is the national standard of that country.
Printed in Switzerland
Also issued in French and Russian. Copies to be obtained through the national standards organizations.
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BRIEF HISTORY
The IS0 Recommendation R 821, Particle boards - Determination of dimensions of test
pieces, was drawn up by Technical Committee ISOlTC 89, Boards made from wood or other ligno-
cellulosic fibrous materials, the Secretariat of which is held by the Deutscher Normenausschuss
(DNA).
Work on this question by the Technical Committee began in 1963 and led, in 1964, to the
adoption of a Draft IS0 Recommendation.
In May 1966, this Draft IS0 Recommendation (No. 959) was circulated to all the IS0 Member
Bodies for enquiry. It was approved, subject to a few modifications of an editorial nature, by the
following Member Bodies :
Austria Israel Sweden
Belgium
Korea, Rep. of Switzerland
Canada Netherlands U.A.R.
Chile
New Zealand United Kingdom
Colombia Norway
U.S.S.R.
Czechoslovakia Poland Yugoslavia
Finland Portugal
France Romania
Germany South Africa,
India Rep. of
Ireland Spain
No Member Body opposed the approval of the Draft.
The Draft IS0 Recommendation was then submitted by correspondence to the IS0 Council,
which decided, in September 1968, to accept it as an IS0 RECOMMENDATION.
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ISO/R 821 -1968 (I
IS0 Recommendation R 821 September 1968
PARTICLE BOARDS
DETERMINATION OF DIMENSIONS OF TEST PIECES
1. SCOPE
This IS0 Recommendation describes a method for measuring the thickness, length and width of test
pieces of particle boards, defined in IS0 Recommendation R 820, Particle boards - Definition -
Classifica tion.
2. APPARATUS
2.1 Micrometer, having flat and parallel circular measuring surfaces of 16 f 1 mm diame ter (approx-
imately 200 mm'). The graduation of the apparatus should allow a reading to an accuracy of
0.01 mm.
2.2 Sliding caliper, or any other instrument with a jaw thickness of at least 5 mm, and graduated to
allow a reading to an accuracy of 0.1 mm.
2.3 Balance, allowing a reading to an accuracy of 0.01 g.
3. SAMPLING AND TEST PIECES
3.1 Sampling and cutting of the test pieces should be carried out in accordance with IS0 Recom-
mendation R . . ., *Particle boards ~ Sampling, cuttingand inspection.
3.2 Test pieces. The dimensions of the test pieces should be in accordance with those specified in
the relevant test method.
3.3 Conditioning. The test pieces should be conditioned to constant mass ** in an atmosphere of a
relative humidity of 65 f 5 and a temperature of 20 f 2 OC.
*
At present at the stage of draft proposal.
**
Constant mass is considered to be reached when two successive weighing operations, carried out at an interval
of 24 hours, do not differ by more than 0.1 ob of the mass of the test piece.
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ISO/R 821-1968 (E)
4. PROCEDURE
4.1
For measuring the thickness, the measuring surfaces of the micrometer should be applied slowly
to the test piece
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