ISO 7823-2:1989
(Main)Plastics — Poly(methyl methacrylate) sheets — Types, dimensions and characteristics — Part 2: Melt-calendered extruded sheets
Plastics — Poly(methyl methacrylate) sheets — Types, dimensions and characteristics — Part 2: Melt-calendered extruded sheets
Plastiques — Plaques en poly(méthacrylate de méthyle) — Types, dimensions et caractéristiques — Partie 2: Plaques extrudées-calandrées
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Standards Content (Sample)
IS0
I N TE R NAT1 O NAL
STANDARD 7823-2
First edition
1989-02-1 5
Plastics - Poly(methy1 methacrylate) sheets -
Types, dimensions and characteristics -
Part 2 :
Melt-calendered extruded sheets
Plastiques - Plaques en poly(méthacry1ate de méth yle) - Types, dimensions
et caractéristiques -
Partie 2 : Plaques extrudées-calandrées
Reference number
IS0 7823-2 : 1989 (E)
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IS0 7823-2 : 1989 (E)
Foreword
IS0 (the International Organization for Standardization) is a worldwide federation of
(IS0 member bodies). The work of preparing International
national standards bodies
Standards is normally carried out through IS0 technical committees. Each member
body interested in a subject for which a technical committee has been established has
the right to be represented on that committee. international organizations, govern-
ISO, also take part in the work. IS0
mental and non-governmental, in liaison with
collaborates closely with the international Electrotechnical Commission (IEC) on all
matters of electrotechnical standardization.
Draft International Standards adopted by the technical committees are circulated to
the member bodies for approval before their acceptance as International Standards by
the IS0 Council. They are approved in accordance with IS0 procedures requiring at
least 75 YO approval by the member bodies voting.
International Standard IS0 7823-2 was prepared by Technical Committee ISO/TC 61,
Plastics.
Users should note that all International Standards undergo revision from time to time
and that any reference made herein to any other International Standard implies its
latest edition, unless otherwise stated.
IS0 7823 consists of the following parts, under the general title Plastics - Polylmethyl
methacrylate) sheets - Types, dimensions and characteristics :
- Part 1: Cast sheets
-
Part 2: Melt-calendered extruded sheets
Annexes A and B form an integral part of this international Standard.
O International Organization for Standardization, 1989
Printed in Switzerland
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IS0 7823-2 : 1989 (E)
INTERNATIONAL STANDARD
Plastics - Poly(methy1 methacrylate) sheets -
Types, dimensions and characteristics -
Part 2 :
Melt-calendered extruded sheets
1 Scope and field of application IS0 1628-6, Plastics - Determination of viscosity number and
limiting viscosity number - Part 6: Methyl methacrylate
e
polymers. 3)
1.1 This part of IS0 7823 specifies requirements for
poly(methy1 methacrylate) (PMMA) flat sheets, extruded and
IS0 2039-2, Plastics - Determination of hadrness - Part 2:
melt-calendered from colourless and coloured, transparent,
Rockwell hardness.
translucent and opaque grades of materials defined in 3.1.
IS0 2818, Plastics - Preparation of test specimens by
machining.
The thickness range of sheets covered by this part of
1.2
IS0 7823 is 1.5 to 12 mm.
IS0 2859, Sampling procedures and tables for inspection by
attributes.
IS0 4582, Plastics - Determination of changes in colour and
variations in properties after exposure to daylight under glass,
2 References
natural weathering or artificial light.
IS0 62, Plastics - Determination of water absorption.
IS0 4607, Plastics - Methods of exposure to natural
weathering.
IS0 75, Plastics and ebonite - Determination of temperature
of deflection under load.
IS0 4892, Plastics - Methods of exposure to laboratory light
sources.
IS0 178, Plastics - Determination of flexural properties. 1)
1
IS0 8257-1, plastics - Polyimethyl methacrylate) IPMMAI
IS0 179, Plastics - Determination of the Charpy impacf
moulding and extrusion materials - Part 1: Designation.
0 strength of rigid materials.
EN 2155-5, Measure of the transmittance.
IS0 291, Plastics - Standard atmospheres for conditioning
and testing.
EN 2155-9, Determination of haze.
IS0 306, Plastics - Thermoplastic materials - Determination
EN 2155-12, Determination of coefficient of linear thermal
of Vicat softening temperature.
expansion. ,
i
IS0 489, Plastics - Determination of the refractive index of
transparent plastics.
3 Definitions
IS0 527, Plastics - Determination of tensile properties.2)
For the purposes of this part of ISO7823, the following
definitions apply.
IS0 1133, Plastics - Determination of the melt flow rate of
thermoplastics.
3.1 homopolymers and copolymers of methyl
IS0 1183, Plastics - Methods for determining the density and methacrylate (MMA) : PMMA homopolymers and copoly-
relative density of non-cellular plastics. mers of MMA containing at least 80 % (m/m) of MMA and not
1) At present at the stage of draft. (Revision of IS0 178 : 1975.)
2) At present at the stage of draft. (Revision of ISO/R 527 : 1966.)
3) At present at the stage of draft. (Revision of IS0 1233 : 1975.)
1
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4.4 Dimensions
more than 20 % (rn/rn) of acrylic ester or other suitable
monomers. They include both unmodified materials and
The shape of he sheet shall be substantially rectangular or
materials containing lubricants, processing aids, UV absorbers,
square. The tolerances t on squareness shall be agreed upon by
pigments and colourants. They do not include PMMA modified
the interested parties.
with elastomers (see IS0 8257-1 1.
4.4.1 Lengthland width
3.2 flat PMMA sheets: Sheets with two plane, substan-
tially parallel surfaces.
The length and width of the sheets shall be agreed upon by the
interested parties. For cut sheets, the tolerances for each sheet
are specified ir table 2.
4 General requirements
Table 2 - Tolerance on length and width
4.1 Protection of surface
Length or width Tolerance
Unless otherwise agreed upon by the interested parties, the mrn rnrn
surfaces of the sheet, as delivered, shall be protected by
c3
suitable material, for example kraft paper secured with a water- ûp ti 1 000 O
I I
soluble or pressure-sensitive adhesive or a polyethylene film,
+6
O
readily removable without surface contamination or damage.
19
O
4.2 Appearance
4.2.1 Surface defects
The sheet shall have a smooth surface. There shall be no sur-
face defects, scratches or marks larger than 5 mm* each
anywhere in the sheet.
4.2.2 Inclusion defects
There shall be no bubbles, large inclusions, cracks or other
defects that could adversely affect the performance of the
sheet in its intended application. There shall be no foreign mat-
ter inclusions larger than 4 mm2 each anywhere in the sheet.
4.2.3 Classification of defects
The area of defects found in the sheet shall be classified as
specified in table 1, Each defect shall be considered separately.
locations.
Table 1 - Classification of defects
I Classification I Surface defects I Inclusion defects I
~-
I- Negligible 7 Less than 2 mrn2 I Lessthan 1 mrn2 I
5.1 Basic properties
Acceptable 2 to 5 mrn2 1 to 4 mrn2
I I
The ranges of the values of the basic properties of PMMA melt-
calendered extruded sheets are given in table 3.
4.2.4 Distribution of defects
5.2 Optional requirements
4.2.4.1 There shall not be a significant (for the application)
Requirements may be agreed upon by the interested parties for
amount of fine defects, each of which is defined as negligible in
properties needed for particular applications (see table 4).
table 1, within 1 m2 anywhere in the sheet.
4.2.4.2 No defect defined as acceptable in table 1 shall be
6 Test methods
within 500 mm of another acceptable defect anywhere in or on
the sheet.
6.1 General
4.3 Colour 6.1.1 Sampling
The colour distribution shall be homogenous, unless otherwise A sample sufficient to determine the compliance of the material
with this specification shall be selected in accordance with
specified. Variations in colours shall be agreed between the in-
IS0 2859 at random from each batch of the material.
terested parties.
2
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IS0 7823-2 : 1989 (E)
6.1.2 Conditioning and testing atmospheres notched bar IS0 179/1D (dimensions of specimen
80 mm x 10 mm x 4 mm) or IS0 179/2D (dimensions of
Conditioning of specimens (48 h) and tests shall be carried out
specimen 50 mm x 6 mm x 4 mm). The pendulum shall
in accordance with IS0 291 at 23 f 2 OC and (50 I 5) %
strike the surface that is opposite to the original one if the
relative humidity, except for the Vicat softening point and the
specimen has been machined to the specified dimensions.
deflection temperature (see 6.6.1 and 6.6.2).
Specimens shall be cut so that they are oriented perpendicular
to the machine direction (see also 6.1.4).
6.1.3 Preparation of test specimens
6.5.4 The Rockwell hardness shall be determined in ac-
Test specimens shall be prepared in accordance with the pro-
cordance with IS0 2039-2, scale M, on the original melt-
cedures specified in IS0 2818, whenever applicable.
calendered extruded surface.
When it is necessary to machine the sheet to the thickness re-
quired for a particular test method, one orig
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