GB/T 6342-1996 English PDF (GBT6342-1996)

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GB/T 6342-1996: Cellular plastics and rubbers. Determination of linear dimensions
GB/T 6344-2008
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
GB/T 6342-1996
ISO 1923-1981
Replacing GB 6342-86
Cellular plastics and rubbers - Determination of linear
dimensions
Approved on: April 10, 1996 Implementation date: December 1, 1996
Issued by: China State Bureau of Technical Supervision
Table of Contents
1 Subject content and applicable scope ... 3
2 Definitions ... 3
3 Instruments and devices ... 3
4 Procedure ... 4
5 Test report ... 6
Annex A Dial gauge (Informative) ... 7
Additional explanation: ... 8
Cellular plastics and rubbers - Determination of linear
dimensions
This standard is identical to the international standard ISO 1923-1981 Cellular
plastics and rubbers - Determination of linear dimensions.
1 Subject content and applicable scope
This standard specifies the characteristics and the choice of the measuring
equipment and procedure for determination of the linear dimensions of sheets,
blocks or test specimens of cellular material (flexible and rigid).
This standard is applicable to the determination of linear dimensions of cellular
plastics and rubbers.
2 Definitions
linear dimension: the shortest distance between two specific points, between
two parallel lines or between two parallel planes, defined by corners, edges or
surfaces of the cellular specimen
3 Instruments and devices
3.1 Dial gauge with a measuring surface of about 10cm2. The gauging
pressure shall be 100±10Pa, and the reading accuracy shall be 0.05mm, as
shown in Annex A.
3.2 Micrometer: having a measuring surface with a minimum diameter of
5mm, but in any case not less than 5 times the average diameter of the cells,
permitting reading with an accuracy of 0.05mm.
Use of a micrometer is restricted to rigid cellular materials.
3.3 Sliding caliper: with a vernier permitting reading to an accuracy of 0.1mm.
The median of 3 readings at each position shall be taken and the average of
the 5 or more median values calculated.
4.3 Measurement with dial gauge
The measurement shall normally be made on a base plate. The base plate
must be larger than the largest dimension of the specimen that is supported by
the base plate. The specimen shall rest flat upon the base plate during the
measurements.
The readings of the dial gauge shall be rounded off to the nearest 0.1mm.
4.4 Measurement with micrometer
For the measurement, the plane surfaces of the micrometer shall be
continuously brought together until they just touch the cellular material, without
causing any distortion or damage of the surface of the specimen. The
specimen shall be moved slightly back and forward. Simultaneously the plane
surfaces of the micrometer shall be slowly brought together until a slight
resistance to the movement is felt.
The area of the measuring surface may be increased by measuring over metal
sheet or plate.
The readings of the micrometer shall be rounded off to the nearest 0.1mm.
4.5 Measurement with sliding caliper
The readings of the sliding caliper shall be rounded off to the nearest 0.2mm.
The caliper shall be progressively preset to smaller measurements and
presented to the specimen until the setting is reached when the caliper
measuring faces just touch the surfaces of the specimen without any
compression or damage to the latter.
4.6 Measurement with metal rule or metal tape
The cellular material shall not be distorted or damaged by the application of the
metal rule or metal tape.
The metal rule or metal tape measurements shall be rounded off to the nearest
1mm.
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