Difference of ACQ & Copper Azole

Certificate Of Legality and Sustainability

No	Copper Azole	Alkaline Copper Quaternary
	Dispersed CA-C (µCA-C) treated Pine	ACQ (type D) treated Pine
1	Lower retention (azole active broadens its spectrum of activity to give complete protection against wood decay organisms and is the perfect productfor use in above ground, in ground and water contact situations)	Higher retention (due to poorer performance against certain copper tolerant decay fungi)
2	Less corrosive to fastener	More corrosives to fastener
3	Lighter in colour (improved paintability)	Darker in colour
4	Lower leaching during service (exterior application)	Higher leaching during service (exterior application)
5	Economical Choice (lower treatment cost compare to treatment cost of timber treated with high retention wood preservatives)	-
6	Higher water repellent properties – better dimension stability (only applicable to pine which treated dispersed CA-C with Stabilizer water repellent.	-
7	-	ACQ treated pine has not proven termite resistant in tropical climate

Leaching test result and Corrosion Test Result extracted from :
A Comprehensive Review of Copper-Based wood Preservatives with a focus on new micronized or dispersed copper systems
By Mike H. Freeman and Craig R. Mclntyre. Forest Product J. 58 (11): 6-27.Forest Product Society, Nov 08.

ICC-ES is the United States' leader in evaluating building products for compliance with code. A nonprofit,
public-benefit corporation, ICC-ES does technical evaluations of building products, components, methods,
and materials. http://www.icc-es.org/

" Micro CA" is used for systems with azole co-biocides. In some cases, two or more copper azole variations were included in the same test so the different formulations are designated with a numerical suffix. The primary emphasis is to compare the Micro and amine products in the same test Lastly, the amine-solubilized formulations are simply as CA -B or ACQ-D

MSU-Mississippi State University; TPI-Timber Products Inc; BDL-Below Detect Limit

TPI- Timber Products Inc; SUNY- State University of New York

The protocal developed by the AWPA in cooperation with the International Staple, Nail and Tool Association (ISANTA) was used by Michigan State University researchers to evaluate fastener corrosion in contact with micronized formulations.

Summary:
Property testing demonstrated that micronized systems leach less than the soluble counterparts and have improved corrosion properties.