ISO 14631 pdf download.Extruded sheets of impact-modified polystyrene (PS-I) — Requirements and test methods
1 Scope
This standard specifies the requirements and test methods for solid flat extruded sheets of impact-modified polystyrene (PS-I 1 ) without fillers and reinforcing materials. This standard applies only to thickness 0,25 mm to 20,0 mm in accordance with clause 3. This standard also applies to PS-I sheet in roll 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 incorpo- rated in it by amendment or revision. For undated references the latest edition of the publi- cation referred to applies.
3 Material
Sheets shall be made of PS-I extrusion compounds designated by ISO 2897-1 without filler and reinforcing material. Extrusion compounds can contain additives such as processing aids, stabilizers, flame protective agents and colorants. Compounds and additives of un- known identity shall not be used. NOTE: Legal conditions 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, if not embossed, and free from grooves, sink marks or damages. Colorants shall be homogeneously distributed throughout the material. Slight colour differences based on ex- trusion compounds and processing are admissible. Admissible variations in any of the above as well as gloss level specifications, if required, shall be agreed between the interested par- ties. 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 is in the direction of extrusion. For any individ- ual sheet selected at random from any delivery, the tolerances of length and width shall be in accordance with table 1 . Testing shall be in accordance with 5.4.2.
5 Test Methods
5.1 Test specimens 5.1.1 Preparation of test specimens Representative test specimens shall be cut longitudinally and transversely evenly distributed over the length and width of the sheet. From a sheet in roll form, a 2 m 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 faults 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 no. 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 5.6.1 to 5.6.6 shall be machined down on one side to a thickness of 4,0 ± 0,2 mm in accordance with EN ISO 281 8. 5.1.2 Conditioning Any production quality control test specimens shall be conditioned for at least 1 6 h at stan- dard atmosphere (23/50) in accordance with EN ISO 291 . Shorter conditioning times may be used by agreement with the interested parties when it can be shown that there is no signifi- cant difference in the results obtained. 5.1.3 Testing Testing shall be carried out at standard atmosphere (23/50) in accordance with EN ISO 291 , unless agreed differently between the interested parties or specified in the individual testing standards. 5.2 Delivery condition Surfaces and cutting edges should be visually examined for bubbles, voids, cracks, notches and swarf.