Plast

Ämnesområden: Plast: allmänt
Kommittébeteckning: SIS/TK 156 (Plast)
Källa: ISO
Svarsdatum: den 1 mar 2021
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ISO 4892-2:2013 specifies methods for exposing specimens to xenon-arc light in the presence of moisture to reproduce the weathering effects (temperature, humidity and/or wetting) that occur when materials are exposed in actual end-use environments to daylight or to daylight filtered through window glass.

Kommittébeteckning: SIS/TK 156 (Plast)
Källa: ISO
Svarsdatum: den 18 mar 2021
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This document specifies the requirements for the laboratory testing of the resistivity of specially prepared specimens of plastics rendered conductive by the inclusion of carbon black. The test is suitable for materials of resistivity less than 106 Ω⋅cm (104 Ω⋅m). The result is not strictly a volume resistivity, because of surface conduction, but the effects of the latter are generally negligible.

Ämnesområden: Plast: allmänt
Kommittébeteckning: SIS/TK 156 (Plast)
Källa: CEN
Svarsdatum: den 22 mar 2021
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This document specifies the general terms and definitions relevant for the utilisation of thermoplastics recyclates in thermoplastics pipes, fittings and ancillaries for both pressure and non-pressure piping systems.
This document is intended to be used by specification writers in conjunction with prCEN/TR 14541-2 and prCEN/TR 14541-3 when preparing normative documents under the scope of CEN/TC 155.

Ämnesområden: Plast: allmänt
Kommittébeteckning: SIS/TK 156 (Plast)
Källa: ISO
Svarsdatum: den 1 apr 2021
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This document specifies two methods for evaluating the melting behaviour of semi-crystalline polymers.
Melting temperatures determined by the different methods usually differ by several kelvins for the reasons explained in the introduction.
Method A: Capillary tube
This method is based on the changes in shape of the polymer. It is applicable to all semi-crystalline polymers and their compounds.
NOTE 1 Method A can also be useful for the evaluation of the softening of non-crystalline solids.
Method B: Polarizing microscope
This method is based on changes in the optical properties of the polymer. It is applicable to polymers containing a birefringent crystalline phase. It may not be suitable for plastics compounds containing pigments and/or other additives which could interfere with the birefringence of the polymeric crystalline zone.
NOTE 2 Another method applicable to semi-crystalline polymers is described in ISO 11357-3, Plastics — Differential scanning calorimetry (DSC) — Part 3: Determination of temperature and enthalpy of melting and crystallization.