BS ISO 29864:2018 pdf download

BS ISO 29864:2018 pdf download.Self adhesive tapes — Measurement of breaking strength and elongation at break
1 Scope
This document specifies methods to measure the breaking strength and elongation at break of a self adhesive tape when it is subjected to a tensile force sufficient to cause it to break. These test methods describe a procedure for testing 12 mm or 24 mm wide samples cut from supplied rolls of self adhesive tapes. Alternatively rolls of self adhesive tape up to 50 mm wide can be directly tested in their original width. In these circumstances the practical breaking strength and elongation will be typical of the manufacturer’s cut edges. When newly cut sample pieces are tested, because of the better cutting of the edges, the results can be higher than would be found on commercial tape.
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.
EN 12481, Self adhesive tapes — Terminology
3 Terms and definitions
For the purposes of this document, the terms and definitions given in EN 12481 and the following apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— IEC Electropedia: available at http://www.electropedia.org/
— ISO Online browsing platform: available at https://www.iso.org/obp
3.1 breaking strength
ability to resist breaking when subject to load under prescribed conditions
3.2 elongation at break
increase in length of the adhesive tape at the time of breaking as a percentage of the original length
3.3 self adhesive tape
pressure sensitive adhesive
adhesive which in a dry state is permanently tacky at room temperature and adheres readily to surfaces under brief and light pressure
4 Significance and use
These methods provide a means of assessing the uniformity of breaking strength and elongation at break of a given type of pressure sensitive tape and may be used to compare one product with another.They may be used to determine particular backing materials or tape widths appropriate to a desired end use.
When relative strength is of interest, the testing should be on tape in the width received to avoid discrepancies as described above. NOTE 1 Comparison of tapes by different procedures should be avoided because test parameters such as test piece dimension or jaw speed determine the result. Different levels will produce different results for the same test tape. It is usual to find breaking strength increasing significantly with increasing jaw speed. NOTE 2 Elongation measurements become difficult to perform on stretchy materials (greater than 200 % elongation at break) when the ratio of test piece length to width is small (approaching 2). The results show high variability and do not allow for practical use of this information except when one wishes to demonstrate large differences between materials.