EN 1875-3-1997 pdf download.Rubber – or plastics coated fabrics-Determination of tear strength Part 3 : Trapezoidal method.
This EN 1875-3 specifies test conditions and the procedure to be followed for detemunrng the tear strength of a trapezoidal specimen of a rubber— or pbstics-coated fabric, using a tensile testrng machine. This test may be carried out:
— either on test specimens con(htloned in reference
atmospheres; or
— on test. specimens which have been subjected to
any necessary treatment for tiw a)p1icatiofl
consi(Iered, for example dipping.
2 Normative references
This Europeaii Standard uwoqx)rates, by dated or undated reference, provisions from other publications. These normative references are cited at the appropriate places in the text and the publications are listed hereunder. For dated references, further aflwn(hnentS or revisions apply to the l)reseflt European Standard only if they have been uworporated by unendment or revision. For un(lated references the most recent edition of the cited pLll)lwation apply.
EN ISo 22.31 Rubber- o, plasf iCS-CO(lfrd fabrics — Standard atmospheres for conditioning and testing EN 22286 Rubber- or pk,stics-coa ted fribries — Dth’rm inalion of roll charncteristtcs
ISo 7500- 1 M(’taIlie ,nak’ru,Is — Verficatim Qf static un iaral testing machines — Part 1 Tensile testing
?fl41(hi?WS
3 Definitions
For the purposes of this sIan(lard the following definitions apply:
tear strength of coated fabrics
the property of a coated fabric to resist a force tending to separate the threads or fibres making up the coated fabric before tearing, by breaking some of these threads or fibres
4 Principle
The threads or fibres forming a coated fabric are Sul)jeeted successively to a force (lesigned to break them. The values of the breaking forces are recorded as the moi)lle jaw moves.
5 Apparatus
5.1 Constant rule of e.rtension (CRE) tensile testing machine, fitted with parallel jaws, having the following general characteristics.
The tensile testing machine shall be provided with means for reading and recording both the force applied to the test specimen in stretching it to rupture and the corresponding extension of the test specimen. It will be provided with a strength indicator having several scales in order to ensure that the rupture of each test specimen shall be obtained with a strength of 15 % to 85 % of the maximum of the scale used. Under conditions of use, the accuracy of the apparatus should be of class 1 in accordance with ISo 7500-1. The error of the indicated or recorded maximum force at any point in the range in which the machine is used shall not exceed ± 196, and the error of the indicated or recorded jaw separation shall not exceed 1 nun. After the first 2 s of the test, the rate of increase in the (hStaiIee I)etWv’dn the clamps shall l)e uniform to within 5%.
6 Test specimens
6.1 Atmosphere for conditioning and testing Samples shall be conditioned in one of the atmospheres as specified in EN ISO 2231. The test shall be carried out in the same atmosphere.
These requirements need not be applied to samples that. have been subjected to some treatments such as
dipping.
6.2 Sampling
Specimens shall be taken from the sample at a position with no vlsil)le or functional flaw and shall be located within the useful width of the part as defined in
EN 22286.
6.3 Dimensions
Each test specmwn shall have the following dimensions:
(75 ± 1) mni X (150 ± 1) mm (see Figure 1)
6.4 Number
For each nieasurenwnt series, take live test specrniens in the longitudinal direction and five test. specimens in the transverse direction.
6.5 Preparation
For the measurements of the longitudinal tearing force (for a woven fabric, breakage of the warp threads), the length of the test specimen shall be parallel to the edge of the coated Inul.
For the measurements of the tnuisverse tearing force (for a woven fabric, breakage of the weft threads), the length of the test specimen shall be perpefl(hCLilar to the edge of the coated part.
Mark the position of the attachments on the test specimen, then make the initiating incision, as shown in FIgure 1.EN 1875-3-1997 pdf download.
EN 1875-3-1997 pdf download
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