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This specification covers polyvinyl acetate or polyvinyl acetate copolymer resin emulsion adhesives suitable for use on wood, wood-based substrates, or plastic laminates. This does not cover the group of polyvinyl-based adhesives suitable for bonding flexible films. Adhesives are classified on the basis of water resistance at three performance levels, namely wet-use (Type 1), intermediate use (Type 2), and dry-use (Type 3). Adhesives shall conform to test requirements as performed under the following exposure conditions and treatments: dry shear at specified temperatures; two-cycle boil; 48-hour soak; humidity exposure; freeze-thaw stability; and storage life. Materials shall also adhere to physical properties such as density, nonvolatile matter, and pH.
Область применения1.1 This specification covers polyvinyl acetate or polyvinyl acetate copolymer resin emulsion adhesives suitable for use on wood, wood-based substrates, or plastic laminates. It does not cover the group of polyvinyl-based adhesives which are suitable for bonding flexible films.
1.2 The adhesives are classified at three performance levels in accordance with water-resistance as shown in Table 1 and Table 2. See Section 5 for a description of the expected exposure conditions for each class of adhesive. See Table X1.1 for a classification of typical end products that are manufactured using adhesives at the three performance levels covered by this specification.
(A) Or 40 % of dry value at 75°F (24°C), whichever is larger.(B) Testing and certification for freeze-thaw stability is optional. To classify a test adhesive as freeze-thaw stable, test an initial lot of the adhesive brand in accordance with 6.2 and 10.3.3.7.(C) Testing of an initial lot of the adhesive brand in accordance with 6.3 and 10.3.3.8 is required. (A) See Table 9 in Interim Voluntary Product Standard for Hardwood and Decorative Plywood, HP-1, 1993.1.3 The following index is provided as a guide to the test methods portion of this specification:
Section
Tests for Physical Properties
9
Viscosity
9.1.1
Density
9.1.2
Nonvolatiles
9.1.3
pH
9.1.4
Tests for Adhesive Bond
10
Block Shear Strength, Compression
10.2
Plywood Shear Tests
10.3
1.4 The values stated in SI units are to be regarded as the standard. The values given in parenthesis are for information purposes only.
1.5 The following safety hazards caveat pertains only to the test method portion, Sections 9 and 10, of this specification: 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.