ISO 527-3:2018 download free.Plastics — Determination of tensile properties — Part 3: Test conditions for films and sheets.
Plastics — Determination of tensile properties — Part 3:
Test conditions for films and sheets
I Scope
1.1 ISO 527-3 specifies the conditions for determining the tensile properties of plastic films or sheets less than 1 mm thick, based upon the general principles given In ISO 527-1.
NOTE For sheets greater than 1 mm thick, the user is referred to ISO S272.
1.2 See ISO 527-1:2012, 12.
1.3 This document is not normally suitable for determining the tensile properties of
a) cellular materials, and
b) plastics reinforced by textile fibres.
1.4 See ISO 527-1:2012, 1.3,
2 Normative references
The following documents are referred to In the text In such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (Including any amendments) applies.
ISO 527-1:2012, Plastics — Determination of tensile properties — Port 1: General principles
ISO 4591. Plastics — Film and sheeting — Determination of average thickness of a sample, and average thickness and yield of a roll. bygravimetric techniques (grovimetnc thtckness)
ISO 4593, PlastIcs — Film and sheeting — Determination of thickness by mechanical scanning
3 Terms and definitions
For the purposes of ISO 527-3, the terms and definitions given in ISO 527-1 apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
4 Principle
See IS0 527-1 : 2012.4.1 .
5 Apparatus
See ISO 527-1:2012, ClauseS, subject to the following additional requirements.
According to ISO 527-1:2012. 5.1.2, the tensile-testing machine shall be capable of maintaining the speeds of testing as specified in ISO 527-1:2012, Table 1. It is normal for films and sheets to be tested at a speed of 5 mm/mm. 50 mm/mm, 100 mm/mm, 200 mm/nun. 300 mm/mm or 500 mm/mm. The information contained In ISO 527-1:2012.9.6, also applies.
According to ISO S27•1:2012, 5.1.5, when testing thin sheets or film material, the specimen shall not carry the weight of the extensnmeter.
According to ISO 527-1:2012, 5.2, devices complying with the requirements in ISO 4593 shall be used for measunng the thickness, except in the case of very thin film (less than 0,01 mm thick) or embossed film. In those cases, the thickness shall be determined by the method specified in ISO 4591. When ISO 4591 is used, the average thickness of the film sample shall be taken as the thickness of the test specimen.
6 Test specimens
6.1 Shape and dimensions
6.1.1 The preferred form of test specimen For the determination of tensile properties by this method is a strip that is 10mm to 25mm wide and not less than 150mm long (specimen type 2 — see Figure.1). having two parallel gauge marks, 50mm apart, on the central portion of the specimen.
Some film materials have a very high elongation at break which may result in them being outside the stretching capacity of the testing machine. In such cases, it is permissible to reduce the initial distance between the grips to 50 mm.
6,1.2 When required by the specification for the material under test or for routine quality-control tests, dumb-bell specimen types 5, lB and 4 of the shape and dimensions shown In Figures 2. and & may be used. These specImens are convenient to produce and permit rapid quality-control testing.
Specimen type 5 (see Figure 2) is recommended for film and sheet with a very high strain at break. Specimen type 4 Is recommended for other types of flexible thermoplastic sheeL
Specimen type 18 (see FiXure 3) is recommended for rigid sheets.
6.2 Preparation of specimens
6.2.1 The test specimens described In 6L1 shall be cut or punched so that the edges are smooth and Free from notches; examination with a iow.power magnifier is recommended to check the absence of notches. Razor blades, suitable paper cutters, scalpels or other devices capable of cutting the specimens to the proper width and producing straight, dean, parallel edges with no visible imperfections shall be used. Punch dies shall be kept sharp by regular honing, and a suitable backing material shall be used with punch dies to ensure a cleancut edge.
6.22 The test specimens described in 6.L2 shall be obtained by the use of punch dies, using suitable backing material to ensure a clean-cut edge. Dies shall be kept sharp by regular honing, and the edges of the specimen shall be examined with a low-power magnifier to ensure the absence of notches. Discard any specimen with obvious imperfections on the cut edges.
6.3 Gauge marks
See ISO 527-1:2012.6.3.
The marking device used to produce the gauge marks shall have two parallel edges which are ground smooth and true, 0,05 mm to 0,10 mm wide at the edge and bevelled at an angle of not more than 15. An ink stamp may also be used to apply ink to the area of the gauge marks, before or after producing them with the marking device, using an ink of a suitable contrasting colour that has no deleterious effect on the film being tested.
6.4 Checking the specimens
Discard any test specimen with obvious imperfections on the cut edges.
6.5 Anisotropy
The properties of certain types of film material may vary with direction in the plane of the film (anlsotropy). In such cases, It Is essential to prepare two groups of test specimens with their major axes respectively parallel and perpendicular to the direction of orientation of the film.
7 Number of specimens
See ISO 527’l:2012, Clause 7.
8 Conditioning
See ISO 5274:2012, Clause 8.
9 Procedure
See ISO 527-1:20 12, Clause 9.
10 Calculation and expression of results
See ISO 527-1:2012, Clause 10 except for ISO 527-1:2012. 10.3 and ISO 527-1:2012,10.4.
11 PrecisIon
The precision of the test method Is not known because interlaboratory data are not available, When Intertaboratory data are obtained, a precision statement will be added at the following revision.
12 Test report
The test report shall indude the following information:
a) a reference to this document. i.e. ISO 527-3:2018, including the type of specimen and the test speed written in the following format:
Tensile test lS0527-3/lB/50
Type of specimen
Test speed in millimetres per minute
b) see ISO 527-1:201 2, Clause 12 b)toq).