ISO 14632 pdf download.Extruded sheets of polyethylene (PE-HD) — Requirements and test methods
1 Scope
This standard specifies the requirements and test methods for solid flat extruded sheets of polyethylene homopolymers (PE – HD) without fillers or reinforcing materials. This standard applies only to thicknesses of 0,5 mm to 40 mm. This standard also applies to PE – HD sheet in rolled form.
2 Normative references
This European standard incorporates, 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 hereafter. For dated references, subsequent amendments to or revisions of any of these publications apply to this European standard only when incorporated in it by amendment or revision. For undated references the latest edition of the publication referred to applies.
3 Material
Sheets consist of PE extrusion compounds designated by ISO 1 872-1 without fillers or reinforcing materials. Extrusion compounds can contain additives such as processing aids, stabilisers, flame protective agents and colorants. Compounds and additives of unknown identity shall not be used. NOTE: Legal requirements can cause a specific choice of extrusion compounds (see 4.3.3).
4 Requirements
4.1 Appearance Sheets shall be substantially free from bubbles, voids, cracks, visible impurities and other defects which would make them unfit for the intended use. Surfaces shall be substantially smooth and free from sharp grooves, sink marks or damage. Colorants shall be homogeneously distributed throughout the material. Slight colour differences due to the particular extrusion compound or processing procedure used are admissible. Admissible variations in any of the above shall be agreed between the interested parties. Sheets shall be examined in accordance with 5.3.4.2.2 Length and width Nominal length , l n , and nominal width , b n , of sheets shall be agreed between the interested parties. Unless agreed differently, the length shall be in the direction of extrusion. For any individual sheet selected at random from any delivery, the tolerances on length and width shall be in accordance with table 1 . Testing shall be in accordance with 5.4.2.4.2.3 Rectangularity For any individual sheet, selected at random from any delivery, the rectangularity tolerance expressed as the difference between the length of the diagonals ( d 1 – d 2 , see figure 1 ) shall be in accordance with table A.1 of annex A (normative)
5 Test methods
5.1 Test specimens 5.1.1 Preparation of test specimens Representative test specimens shall be cut longitudinally and transversely from locations evenly distributed over the length and width of the sheet. From a sheet in roll form, a two metre sample shall be cut from the end of the roll to provide test specimens. Surfaces of the test specimens shall be free from damage and other defects in order to avoid notch effects. Should any burrs occur on the test specimens during production these shall be eliminated without damaging the surfaces of the test specimen. If required, the cut edges shall be finished with abrasive paper (grain number 220 or finer), the direction of abrasion being along the length of the test specimens. If it is necessary to machine the sheet to reduce it to the thickness required, one original surface shall be left intact. In particular, test specimens over 4,2 mm thick intended to be used in the tests described in 5.6 to 5.8 shall be machined down on one side to a thickness of 4,0 mm ± 0,2 mm in accordance with EN ISO 2 81 8. 5.1.2 Conditioning All test specimens shall be conditioned for at least 1 6 hours at standard atmosphere (23) in accordance with EN ISO 291 . Shorter conditioning times shall be used by agreement between the interested parties when it can be shown that there is no significant difference in the results obtained. 5.1.3 Testing Testing shall be carried out at standard atmosphere (23) in accordance with EN ISO 291 , unless agreed differently between the interested parties or specified differently in the individual testing standards.