This International Standard specifies methods for determining the water content of plastics presented as powder, granules or finished products. These procedures do not test the water absorption (kinetics and equilibrium) of plastics, as ISO 62 does. Method A is suitable for determining the water content down to 0.1% with a measurement uncertainty of 0.1%. Methods B and C are suitable for determining water content down to 0.01% with a measurement uncertainty of 0.01%. The water content is an important parameter when processing materials and must always remain below the value specified in the relevant material standards. Four alternative methods are specified in this International Standard: Method A is an extraction method using anhydrous methanol and subsequent titration of the extracted water using the Karl Fischer method. It can be used for all plastics and is applicable to granules with a grain size smaller than 4 mm × 4 mm × 3 mm. The procedure can also e.g. B. can be applied to prepolymer powder materials that are insoluble in methanol. Process B1 is an evaporation process using a tube furnace. The water contained in the analysis quantity is evaporated and transferred to the titration cell using dry air or nitrogen as a carrier gas, in which the collected water is then titrated using the Karl Fischer method. It can be used for all plastics and is applicable to granules with a grain size smaller than 4 mm × 4 mm × 3 mm. Method B2 is an evaporation method using a heated sample vial. The water contained in the analysis quantity is evaporated and transferred to the titration cell using dry air or nitrogen as a carrier gas, in which the collected water is then titrated using the Karl Fischer method. It can be used for all plastics and is applicable to granules with a grain size smaller than 4 mm × 4 mm × 3 mm. Method C is a manometric method. The water content is determined from the increase in pressure after the water has evaporated under vacuum. The method cannot be applied to plastic samples that contain volatile components other than water in quantities that contribute significantly to the vapor pressure at room temperature. At regular intervals, e.g. B. by gas chromatography to check the presence of large amounts of volatile components. These checks are particularly necessary for new types or classes of materials.
EN ISO 15512:2016 Referenced Document
ISO 1628-1:2009 Plastics - Determination of the viscosity of polymers in dilute solution using capillary viscometers - Part 1: General principles
ISO 1628-2:1998 Determination of the viscosity of polymers in dilute solution using capillary viscometers - Part 2: Poly(vinyl chloride) resins
ISO 1628-3:2010 Plastics - Determination of the viscosity of polymers in dilute solution using capillary viscometers - Part 3: Polyethylenes and polypropylenes
ISO 1628-4:1999 Plastics - Determination of the viscosity of polymers in dilute solution using capillary viscometers - Part 4: Polycarbonate (PC) moulding and extrusion materials
ISO 1628-5:1998 Plastics - Determination of the viscosity of polymers in dilute solution using capillary viscometers - Part 5 : Thermoplastic polyester (TP) homopolymers and copolymers
ISO 1628-6:1990 Plastics; determination of viscosity number and limiting viscosity number; part 6: methyl methacrylate polymers
ISO 307:2007 Plastics - Polyamides - Determination of viscosity number
ISO 62:2008 Plastics - Determination of water absorption
ISO 760:1978 Determination of water; Karl Fischer method (General method)
EN ISO 15512:2016 history
2019EN ISO 15512:2019 Plastics - Determination of water content (ISO 15512:2019)