Standard Test Method for
Estimating Package Stability of Coatings for Ultraviolet
This standard is issued under the fixed designation D 4144; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of the last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (e) indicates an editorial change since the last revision or reapproval.
1.1 This method covers procedures for testing the package
stability of coatings intended to be cured by ultraviolet
radiation. One procedure is given for clear coatings and
another for opaque fillers.
1.2 The values stated in inch-pound units are to be regarded
as the standard. The values given in parentheses are for
1.3 This standard does not purport to address all of the
safety concerns, if any, associated with its use. It is the
responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
2. Summary of Method
2.1 Specimens are placed in several containers, some of
which are subjected to an elevated temperature while others are
stored at room temperature. At specified intervals, a specimen is
checked for evidence of gelling. Clear materials are held in
glass containers so they can be examined visually without
opening to prevent contact with air which might inhibit
polymerization. Opaque materials are checked by opening one
can, probing the contents with a spatula to determine the extent
of any polymerization, and then discarding that specimen.
3. Significance and Use
3.1 Coatings intended to be cured by ultraviolet radiation,
especially those involving free radical chemistry, tend to
polymerize during storage. It is of interest to determine how
well, a formulation resists this effect. Many factors influence
the storage stability of a composition. The procedures described here are intended to improve the precision of determining this property. Because the effects of resins, monomers,
photoinitiators, synergists, stabilizers, or pigments can alter the
relation between elevated and room temperature stabilities, any
correlation of performance at two different temperatures is
possible only with a given formulation and, therefore, is useful
only for quality control.
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