ASTM D7733-12

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
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Designation:D7733 −12
StandardSpecification for
Acrylic Dispersion Ground
This standard is issued under the fixed designation D7733; 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.
1. Scope 3.1.4 polymer, n—a long chain synthetic or naturally occur-
ring molecule composed of smaller, repeating units called
1.1 This standard specifies test methods which measure
monomers.
minimum qualities for acrylic dispersion grounds.
3.1.5 size, n—a liquid material that absorbs and penetrates
1.2 The values stated in SI units are to be regarded as the
into a substrate preparing the substrate for a primer or ground
standard. The values given in parentheses are for information
by at least partially sealing the surface and creating more
only.
integrity and less absorption of the surface.
1.3 This standard does not purport to address all of the
3.1.6 strike-through, n—see flash-through.
safety concerns, if any, associated with its use. It is the
responsibility of the user of this standard to establish appro-
4. Significance and Use
priate safety and health practices and determine the applica-
4.1 This specification establishes quality and performance
bility of regulatory limitations prior to use.
requirements and provides a basis for common understanding
among producers, distributors and users.
2. Referenced Documents
4.2 It is not intended that all grounds meeting this require-
2.1 ASTM Standards:
ment be identical nor have uniform excellence in all respects.
D1640 Test Methods for Drying, Curing, or Film Formation
Variation in manufacture not covered in this specification may
of Organic Coatings at Room Temperature
cause some artists to prefer one brand to another, either of
D3359 Test Methods for Measuring Adhesion by Tape Test
which may be acceptable by this specification.
3. Terminology 5. Labeling Requirements
5.1 Acrylic dispersion products conforming to this standard
3.1 Definitions:
will include acrylic, polymer, dispersion polymer, or acrylic
3.1.1 flash-through, n—the visible evidence of oil on the
dispersion in their description to differentiate them from
opposite side of a support to which it was applied; also referred
traditional gessoes.
to as strike-through.
3.1.2 gesso grounds, n:
6. Quality Assurance
3.1.2.1 calcium hydroxide and water (“slaked lime”).
6.1 Conditions not covered in this specification that affect
3.1.2.2 calcium sulfate (“plaster of Paris”) or calcium car-
the quality of acrylic dispersion grounds:
bonate (chalk) prepared with a natural protein glue water.
6.1.1 Substrate—Factors such as the texture, gloss, effective
3.1.2.3 in contemporary usage, the term “gesso” is some-
pH, porosity, chemical composition and condition of the
times used by manufacturers of acrylic dispersion products to
substrate will affect gloss, gloss uniformity, drying time,
describe their products in a brand name.
adhesion and the flexibility of the dried ground.
3.1.3 ground, n—a surface onto which an artist applies
6.1.2 Environmental Conditions—Factors such as
decorative coatings and paints.
temperature, humidity, airflow and light conditions affect
application properties, film formation, drying time and adhe-
sion.
6.1.3 Storage—Factors such as aging and high and low
This specification is under the jurisdiction of ASTM Committee D01 on Paint
and Related Coatings, Materials, andApplications and is the direct responsibility of
temperatures may cause changes in consistency.
Subcommittee D01.57 on Artist Paints and Related Materials.
6.2 Wet Ground Properties:
Current edition approved Feb. 1, 2012. Published March 2012. DOI: 10.1520/
D7733–12.
6.2.1 Viscosity/Consistency—Grounds shall be smooth and
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
consistent except for functional particles that provide tooth.
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
Paste type grounds may not flow or level; ready to brush
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. grounds will flow evenly.
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D7733−12
6.2.2 pH—The pH shall be 7.0 to 10.0. 6.4.5.3 Oil Penetration—Six week after the oil has been
applied, observe the oil drops. For penetration, observe the
6.2.3 Fineness of Dispersion (Grind)—Grind will vary and
back side of the canvas. There must be no evidence of the oil
may contain coarse particles for adhesion, promoting the
functional tooth of the dry ground. flashing through the three-coat section.
6.4.5.4 Oil Absorption—Six weeks after the oil has been
6.2.4 Freeze-Thaw Stability—Using a freezer that has a
temperature of -7°C (20°F) or lower, subject the ground to five applied, observe the front side of the canvas. The oil drops
must not be dried as a bead on the surface: there should be
freeze thaw cycles. A freeze thaw cycle shall consist of
some absorption of the oil into the surface, leaving the surface
freezing the ground to a solid state (minimum 18 h) and then
slightly glossier than the ground and having some visual
thawing the ground (minimum of 5 h) to room tempera-
evidence of the oil still remaining on the surface. The oil shall
ture, 22 6 2°C (72 6 5°F). The ground shall then meet the
requirements of 6.2, 6.3, 6.4. not have wicked or bled more than five times the original
drop’s area (5 to 7 cm).
6.2.5 Drying—Use a 6 mil film applicator (drawdown bar)
tomakeauniformdrawdownon
...