ASTM D7733-12(2021)

Standard Specification for Acrylic Dispersion Ground

ABSTRACT
This specification specifies test methods which measure minimum qualities for acrylic dispersion grounds. It indicates the conditions that affect the quality of acrylic dispersion grounds that are not covered in the specification, such as wet ground properties, dry properties, and storage. This specification also mentions several methods that are used to test some of these conditions, including adhesion, oil hold out, and flexibility.
SCOPE
1.1 This standard specifies test methods which measure minimum qualities for acrylic dispersion grounds.  
1.2 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.  
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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.  
1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

General Information

• Status: Published
• Publication Date: 31-Oct-2021
• ICS: 87.040 - Paints and varnishes
• Technical Committee: D01 - Paint and Related Coatings, Materials, and Applications
• Drafting Committee: D01.57 - Artist Paints and Related Materials

Relations

• Refers: ASTM D1640-03(2009) - Standard Test Methods for Drying, Curing, or Film Formation of Organic Coatings at Room Temperature
• Effective Date: 01-Aug-2009
• Refers: ASTM D3359-09e1 - Standard Test Methods for Measuring Adhesion by Tape Test
• Effective Date: 01-Jun-2009
• Refers: ASTM D3359-07 - Standard Test Methods for Measuring Adhesion by Tape Test
• Effective Date: 01-Nov-2007
• Refers: ASTM D1640-03 - Standard Test Methods for Drying, Curing, or Film Formation of Organic Coatings at Room Temperature
• Effective Date: 01-Dec-2003
• Refers: ASTM D3359-02 - Standard Test Methods for Measuring Adhesion by Tape Test
• Effective Date: 10-Aug-2002
• Refers: ASTM D1640-95(1999) - Standard Test Methods for Drying, Curing, or Film Formation of Organic Coatings at Room Temperature
• Effective Date: 10-Dec-1999

Standards Content (Sample)

This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation: D7733 −12 (Reapproved 2021)
Standard Specification 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 3.1.2.3 in contemporary usage, the term “gesso” is some-
times used by manufacturers of acrylic dispersion products to
1.1 This standard specifies test methods which measure
describe their products in a brand name.
minimum qualities for acrylic dispersion grounds.
3.1.3 ground, n—a surface onto which an artist applies
1.2 The values stated in SI units are to be regarded as the
decorative coatings and paints.
standard. The values given in parentheses are for information
3.1.4 polymer, n—a long chain synthetic or naturally occur-
only.
ring molecule composed of smaller, repeating units called
1.3 This standard does not purport to address all of the
monomers.
safety concerns, if any, associated with its use. It is the
3.1.5 size, n—a liquid material that absorbs and penetrates
responsibility of the user of this standard to establish appro-
into a substrate preparing the substrate for a primer or ground
priate safety, health, and environmental practices and deter-
by at least partially sealing the surface and creating more
mine the applicability of regulatory limitations prior to use.
integrity and less absorption of the surface.
1.4 This international standard was developed in accor-
3.1.6 strike-through, n—see flash-through.
dance with internationally recognized principles on standard-
ization established in the Decision on Principles for the
4. Significance and Use
Development of International Standards, Guides and Recom-
4.1 This specification establishes quality and performance
mendations issued by the World Trade Organization Technical
requirements and provides a basis for common understanding
Barriers to Trade (TBT) Committee.
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
cause some artists to prefer one brand to another, either of
D3359 Test Methods for Rating Adhesion by Tape Test
which may be acceptable by this specification.
3. Terminology 5. Labeling Requirements
3.1 Definitions: 5.1 Acrylic dispersion products conforming to this standard
3.1.1 flash-through, n—the visible evidence of oil on the will include acrylic, polymer, dispersion polymer, or acrylic
opposite side of a support to which it was applied; also referred dispersion in their description to differentiate them from
to as strike-through. traditional gessoes.
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
pH, porosity, chemical composition and condition of the
This specification is under the jurisdiction of ASTM Committee D01 on Paint
substrate will affect gloss, gloss uniformity, drying time,
and Related Coatings, Materials, andApplications and is the direct responsibility of
adhesion and the flexibility of the dried ground.
Subcommittee D01.57 on Artist Paints and Related Materials.
6.1.2 Environmental Conditions—Factors such as
Current edition approved Nov. 1, 2021. Published November 2021. Originally
temperature, humidity, airflow and light conditions affect
approved in 2012. Last previous edition approved in 2016 as D7733 – 12 (2016).
DOI: 10.1520/D7733-12R21.
application properties, film formation, drying time and adhe-
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
sion.
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
6.1.3 Storage—Factors such as aging and high and low
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. temperatures may cause changes in consistency.
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D7733 − 12 (2021)
6.2 Wet Ground Properties: 6.4.5.2 Apply three drops of raw alkali-refined linseed oil
6.2.1 Viscosity/Consistency—Grounds shall be smooth and via eyedropper to the center of each of the 15 by 15 cm (6 by
6 in.) test areas. Each drop shall be .025 6 .00125 mL, with
consistent except for functional particles that provide tooth.
Paste type grounds may not flow or level; ready to brush total volume for the three drops equaling .075 6 .00375 mL.
The eyedropper can be any type, available in any pharmacy.
grounds will flow evenly.
6.4.5.3 Oil Penetration—Six week after the oil has been
6.2.2 pH—The pH shall be 7.0 to 10.0.
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
flashing through the three-coat section.
functional tooth of the dry ground.
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
applied, observe the front side of the canvas. The oil drops
temperature of -7 °C (20 °F) or lower, subject the ground to
must not be dried as a bead on the surface: there should be
five freeze thaw cycles. A freeze thaw cycle shall con
...