ASTM D7733-12 (R2021) pdf free download.Standard Specification for Acrylic Dispersion Ground.
1 .1 ASTM D7733 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.
3.1.2.3 in contemporary usage, the term “gesso” is some- (lines used by manufacturers of acrylic dispersion products to describe their products in a brand name.
3.1.3 ground, n—a surface onto which an artist applies decorative coatings and paints.
3.1.4 polymer; n—a long chain synthetic or naturally occurring molecule composed of smaller, repeating units called monomers.
3.1.5 size, n—a liquid material that absorbs and penetrates into a substrate preparing the substrate for a primer or ground by at least partially sealing the surface and creating more integrity and less absorption of the surface.
3. 1 .6 strike-through, n—see flash-through.
4. Significance and Use
4.1 This specification establishes quality and performance requirements and provides a basis for common understanding among producers, distributors and users.
4.2 It is not intended that all grounds meeting this requirement be identical nor have unifonn excellence in all respects. Variation in manufacture not covered in this specification may cause some artists to prefer OflC brand to another, either of which may be acceptable by this specification.
5. Labeling Requirements
5.1 Acrylic dispersion products conforming to this standard will include acrylic, polymer, dispersion polymer. or acrylic dispersion in their description to differentiate them from traditional gessocs.
6. Quality Assurance
6.1 Conditions not covered in this specification that affect the quality of acrylic dispersion grounds:
6.1.1 Substrate—Factors such as the texture, gloss. eftèctive p1-I. porosity. chemical composition and condition of the substrate will affect gloss, gloss uniformity, drying time, adhesion and the flexibility of the dried ground.
6. 1 .2 Environmental Conditions—Factors such as temperature, humidity, airflow and light conditions affect application properties, film formation, drying time and adhesion.
6.1.3 Storage—Factors such as aging and high and low temperatures may cause changes in consistency.ASTM D7733 pdf download.