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UDC 676:620.1
IS0
I N TER N AT1 O N AL O R GA N I ZATl O N
FOR STAN DAR D I ZAT I O N
IS0 RECOMMENDATION
R 534
DETERMINATION OF THE THICKNESS
OF SINGLE SHEETS OF PAPER
1 st EDITION
January 1967
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 534, Determination of the Thickness of Single Sheets of Paper,
was drawn up by Technical Committee ISO/TC 6, Paper, Board and Pubs, the Secretariat of
which is held by the Association Française de Normalisation (AFNOR).
Work on this question by the Technical Committee began in 1960 and led, in 1964, to the
adoption of a Draft IS0 Recommendation.
In April 1965, this Draft IS0 Recommendation (No.790) 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:
Spain
Argentina Greece
Belgium India Sweden
Brazil Israel Switzerland
Chile Italy Turkey
Czechoslovakia Netherlands U.A.R.
Denmark Norway United Kindgom
U.S. S. R.
Finland Poland
France Portugal Yugoslavia
Germany Romania
Four Member Bodies opposed the approval of the Draft:
Australia
New Zealand
Republic of South Africa
U.S.A.
The Draft IS0 Recommendation was then submitted by correspondence to the IS0
Council, with decided, in January 1967, to accept it as an IS0 RECOMMENDATION.
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ISOlR 534 - 1967 (E)
IS0 Recommendation R 534 January 1967
DETERMINATION OF THE THICKNESS
OF SINGLE SHEETS OF PAPER*
1. SCOPE
This IS0 Recommendation describes a method of measuring the thickness of single sheets of
paper* up to a substance of 250 g/m2.
Unless otherwise stated, the thickness of paper should be determined or checked in accordance
with the present method.
2. PRINCIPLE
The method is based on the use of a precision dial micrometer to measure the thickness of a
single sheet when a static load is applied.
Results are given in terms of the thickness of a single sheet.
3. EQUIPMENT
3.1 Precision dial micrometer
This instrument is provided with two parallel plane faces between which the paper can be
placed for measurement. One of the faces should be capable of movement in a direction
perpendicular to the other, which is fixed. The movable face or pressure foot should be
circular. The fixed face or anvil should also be circular and of such size that the whole area
of the pressure foot is in contact with the anvil in the zero position.
To ensure that the pressure between the faces is uniform within the limits given, the use of
a dead weight rather than a spring is preferred.
Z
The instrument should be checked in accordance with the procedure detailed in the Appendix
and should conform to the following :
I
Characteristics Metric system Inch system
1
Diameter of pressure foot 16 & 0.5 mm 0.63 & 0.02 in
Area of pressure foot 200 mm2 0.31 in2
(nominal value) (nominal value)
Pressure exerted by pressure
foot 1.00 i- 0.10 kgf/cm2 14.2 & 1.5 lbf/in2
Repeatability of measurement
a 0.000 1 in or 0.5% **
(standard deviation) <0.002 5 mm or 0.5% **
0.000 1 in or 0.5% **
Indication error & 0.002 5 mm or 0.5 % * *
Error of parallelism of
a 0.000 2 in or 1 % **
pressure foot and anvil a0.005Ommor 1% **
3.2 Auxiliary apparatus
A set of feeler gauges of thickness known to the nearest 0.001 mm or 0.000 04 in.
3.3 Calibration of the instrument
The instrument should be calibrated at reasonable intervals. The Appendix Z gives details of
the procedure to be followed. For instruments in frequent use, it is suggested that the
calibration be checked daily for repeatability and accuracy, and monthly for parallelism and
foot pressure.
*
The determination of the bulking thickness and bulk of paper is dealt with in I SO Recommendation R 438, Methodfor
the Determination of the Bulking Thickness and Bulk of Paper.
* * Whichever is the greater.
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ISOlR 534 - 1967 (E)
4. SAMPLING AND CONDITIONING
Not less than twenty test pieces each having a size of 6 cm x 6 c
...