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ISO 3251 Document Information:
Title
Paints, varnishes and plastics — Determination of non-volatile-matter content
International Organization for Standardization
Publication Date:
Feb 15, 2008
Scope:
This International Standard specifies a method for determining
the non-volatile-matter content by mass of paints, varnishes,
binders for paints and varnishes, polymer dispersions and
condensation resins such as phenolic resins (resols, novolak
solutions, etc.).
The method is also applicable to formulated dispersions
containing fillers, pigments and other auxiliaries (e.g. thickeners
and film-forming agents). For the method to be usable for
unplasticized polymer dispersions and rubber latices, the
non-volatile residue (which consists essentially of the polymeric
material and of small quantities of auxiliaries such as
emulsifiers, protective colloids, stabilizers, solvents added as
film-forming agents and — especially for rubber latex concentrate —
preserving agents) has to be chemically stable under the test
conditions. For plasticized samples, the residue, by definition,
normally includes the plasticizer.
NOTE 1 The non-volatile-matter content of a product is not an
absolute quantity but depends upon the temperature and period of
heating used for the determination. Consequently, when using this
method, only relative and not true values for non-volatile-matter
content are obtained owing to solvent retention, thermal
decomposition and evaporation of low molecular mass constituents.
The method is therefore primarily intended for testing different
batches of the same type of product.
NOTE 2 This method is suitable for synthetic rubber latices
provided heating for a specific period of time is considered
appropriate (ISO 124 specifies heating until the loss in mass of a
2 g test portion following successive periods of heating is less
than 0,5 mg).
NOTE 3 In-house methods for determining non-volatile matter
often include drying with infrared or microwave radiation.
Standardization of such methods is not possible, since they are not
generally applicable. Some polymer compositions tend to decompose
during such treatment and therefore give incorrect results.
ISO 3233 and ISO 23811 specify methods for determining the
volume of non-volatile matter in paints, varnishes and related
products.
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