-12
STANDARD METHOD FOR DETERMINATION OF PERCENT BOUND ACETYL AND FREE ACETIC
ACID IN ACETYLATED WOOD BY HIGH PERFORMANCE LIQUID CHROMATOGRAPHY
Page 4 of 5
© 2015
Appendix A2: Report of % Free Acetic Acid sample run using 10 min isocratic program
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A50-12
STANDARD METHOD FOR DETERMINATION OF PERCENT BOUND ACETYL AND FREE ACETIC
ACID IN ACETYLATED WOOD BY HIGH PERFORMANCE LIQUID CHROMATOGRAPHY
Page 5 of 5
© 2015
Appendix A3: Report of % Total Acetic Acid obtained from dried wood shavings. The Bound Acetyl result for this
sample is 26.18% x 43/60 = 18.76%
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A51-11
AMERICAN WOOD PROTECTION ASSOCIATION STANDARD
© 2015 All Rights Reserved
STANDARD METHOD FOR DETERMINING PENETRATION
OF PROTECTANT IN ACETYLATED WOOD
Jurisdiction: AWPA Technical Committee P-5
Adopted in 2011
This AWPA Standard is promulgated according to an open, consensus procedure. Using this standard in no way signifies standardization of a
chemical or wood protection system in AWPA Standard U1.
1. Scope: This method is designed to provide samples of
chemically modified wood such that the Assay Region and
the Penetration Region may be separately assessed where
appropriate.
2. Summary: Wood chips are generated using a Forstner
bit. Samples are generated at a depth equivalent to the
Assay Region or the Penetration Region. Samples are then
analyzed using Method A50, Standard Method for
Determination of Percent Bound Acetyl and Free Acetic
Acid in Acetylated Wood by High Performance Liquid
Chromatography. In material of dimension 5/4 or less, the
entire sample is the Assay region.
2.1 Cut a 12" section from the acetylated board.
2.2 Using a Forstner bit of at least 5/8" dimension, drill two
or more holes 0.6" deep near the fresh-cut end, and at least
0.6" from the sides of the timber. Collect the shavings. This
collection represents the Assay Zone sample.
2.3 For material >5/4" and less than 5 inches in thickness,
sample the central one inch or central 25% of the width,
whichever is less, ensuring that the sample is all sapwood.
Collect these samples for Penetration Zone sample.
2.4 Analyze the samples using method A50, Standard
Method for Determination of Percent Bound Acetyl and Free
Acetic Acid in Acetylated Wood by High Performance
Liquid Chromatography. Acceptable penetration is
demonstrated by bound acetyl levels greater than 10%.