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PREN ISO 15512

2013 Edition, March 2013

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Superseded By: BS EN ISO 15512

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W/D S/S BY BS EN ISO 15512
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Description / Abstract:

This International Standard specifies methods for the determination of the water content of plastics in the form of powder, granules and finished articles. These methods do not test for water absorption (kinetics and equilibrium) of plastics as measured by ISO 62. The methods are suitable for the determination of water content as low as 0,01 % or better.

Water content is an important parameter for processing materials, and should remain below the level specified in the appropriate material standard.

Four alternative methods are specified in this International Standard.

a) Method A is an extraction method using anhydrous methanol followed by a Karl-Fischer titration of the extracted water. It can be used for all plastics and is applicable to granules smaller than 4 mm x 4 mm x 3 mm. The method can also be used for e.g. prepolymer materials in the form of a powder that are insoluble in methanol.

NOTE At the next revision of this standard Method A may be removed from this standard or placed in an informative annex.

c) Method B2 is a vaporization method using a heated sample vial. The water contained in the test portion is vaporized and carried to the titration cell by a dry air or nitrogen carrier gas, followed by a Karl-Fischer titration of the collected water. It can be used for all plastics and is applicable to granules smaller than 4 mm x 4 mm x 3 mm.

d) Method C is a manometric method. The water content is determined from the increase in pressure, which results when the water is evaporated under a vacuum. This method is not applicable to plastic samples containing volatile compounds, other than water, in amounts contributing significantly to the vapour pressure at room temperature. Checks for the presence of large amounts of volatile compounds should be carried out periodically, for example by gas chromatography. Such checks are particularly required for new types or grades of material.