ASTM D3891-96(2002)e1

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
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´1
Designation:D3891–96(Reapproved2002)
Standard Practice for
Preparation of Glass Panels for Testing Paint, Varnish,
Lacquer, and Related Products
This standard is issued under the fixed designation D 3891; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
´ NOTE—Keywords were added editorially in July 2002.
1. Scope 4.3 Glass of the following types may be specified in the
applicable test methods:
1.1 This practice covers the preparation of glass panels for
4.3.1 Window Glass, (float glass) the surface of which is
subsequent testing of paint, varnish, lacquer, and related
2 plain and free of irregularities.
products.
1.2 This standard does not purport to address all of the
NOTE 1—Float glass is the most common kind of glass used for
safety concerns, if any, associated with its use. It is the
windows. It is produced by floating a ribbon of red hot glass on a bath of
molten tin. The sides of the float glass exposed to tin and to air have
responsibility of the user of this standard to establish appro-
somewhat different characteristics. The tin side contains tin diffused into
priate safety and health practices and determine the applica-
the glass structure. Paint generally releases more easily from the tin side,
bility of regulatory limitations prior to use.
but it may be contaminated with tin, which could affect chemical analysis.
Paint generally adheres better to the air side. The sides can be distin-
2. Referenced Documents
guished by exposing the glass to a UV-Alight (“black light”): the air side
2.1 ASTM Standards:
will appear clear, and the tin side will appear frosted. Depending on the
D 364 Specification for Industrial Grade Xylene
application, the user may want to choose which side is appropriate for that
test, and make sure that the same side is coated on every panel. Note
D 1152 Specification for Methanol (Methyl Alcohol)
however, that if the window glass used is not float glass (for example,
D 1193 Specification for Reagent Water
plate glass), both sides of the glass will be the same.
3. Significance and Use
4.3.2 Clear Plate Glass, not less than 5 mm thick.
3.1 Theproceduresdescribedinthispracticearedesignedto 4.3.3 Plate Glass that has been ground uniformly on one
provide uniform glass panels for testing of paint, varnish, side with 1F carborundum.
lacquer, conversion coatings and related products. 4.3.4 Black Structural Glass, one side of which has been
polished to a smooth, high-gloss surface.
4. Reagents and Materials
4.3.5 White Structural Glass, one side of which has been
4.1 Purity of Water—Unless otherwise indicated, references polished to a smooth, high gloss.
to water shall be understood to mean reagent water conforming
5. Method of Preparation
to Type IV of Specification D 1193.
4.2 Solvents—Varnish Makers’ and Painters (V M & P) 5.1 New Panels—Using a clean lintless cloth, wipe the
naphtha, xylene, 2-methoxypropanol, and methanol complying panel with a solvent mixture consisting of equal volumes of V
with the appropriate specifications (see Specifications D 364 M&Pnaphthaandxyleneorof3volumesofVM&Pnaphtha
and D 1152). and 1 volume of 2-methoxypropanol or with water. When all
soluble and loosely adhering soil has been washed off, flush
with clean solvent.Allow panels to dry at room temperature or
This practice is under the jurisdiction of ASTM Committee D01 on Paint and force dry at a temperature no higher than 300°F (150°C).After
Related Coatings, Materials, and Applications and is the direct responsibility of
cooling to room temperature,
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