The effects of chromated copper arsenate and ammoniacal copper zinc arsenate
on shear strength development of phenolic resin to Sitka spruce bonds.
Ammoniacal copper zinc arsenate
(ACZA) was developed in the early 1980s as an improvement on ammoniacal copper arsenate (ACA) which dates back to the 1930s.
The bags were wired shut and transported to local treatment plants, where they were commercially treated with copper-8-quinolinolate (oxine copper, CU-8) in light organic sol- vent to the aboveground target retention level of 0.32 kg/[m.sup.3] (as Cu), chromated copper arsenate Type C (CCA), ammoniacal copper zinc arsenate
(ACZA), or ammoniacal copper quaternary, Type B (ACQ) to the ground-contact retention level of 6.4 kg/[m.sup.3].
High-temperature drying was associated with improved penetration of ammoniacal copper zinc arsenate and reduced penetration of chromated copper arsenate.
After curing, one specimen set from each charge was treated with chromated copper arsenate (CCA), while the other was treated with ammoniacal copper zinc arsenate (ACZA) (AWPA 2000a).
1988) and ammoniacal copper zinc arsenate
(ACZA) solutions on Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco) suggests that the ability to heat the solution during treatment should provide improved penetration.
Waterborne preservatives, primarily CCA, but to a limited degree ammoniacal copper zinc arsenate
(ACZA), have been growing in market share, and the advent of preservative additives to improve the climbability in CCA-treated poles has assisted in this growth.
treating solution Preservative Target Actual [a] (%) Ammoniacal copper citrate (CC) 0.37 0.40 0.75 0.78 1.5 1.54 3.0 1.63 Ammoniacal copper quaternary 0.37 0.22 ammonium (ACQ-B) 0.75 0.65 1.5 1.18 3.0 2.20 Ammoniacal copper zinc arsenate
0.37 0.38 (ACZA) 0.75 0.66 1.5 1.50 3.0 2.60 Copper naphthenate 0.31 0.30 0.62 0.64 1.25 1.19 2.5 2.55 Chlorothalonil 0.37 0.42 0.74 0.82 1.48 1.48 2.96 2.87 Creosote 7.5 12.3 15.0 20.0 30.0 38.1 60.0 -- [b] 30 percent diesel in toluene Average retention computed using targeted Preservative concentration of a.i.
The potential for migration of copper, zinc, and arsenic from Douglas-fir lumber treated with ammoniacal copper zinc arsenate
(ACZA) using Best Management Practices (BMPs) was assessed on decking over a seasonal wetland in western Oregon.