Alkaline Copper QUAT

acqAlkaline Copper Quat – ACQ-D Protect®, is a non-arsenical pressure-treatment which is commonly used in residential, industrial, commercial and agricultural applications. ACQ Protect® is also approved for use in construction of marine projects for fresh water and above salt water in splash zone areas. ACQ Protect® has been awarded the EPA’s (environmental Protection Agency) Presidential Green Chemistry Award.

ACQ-D Protect® Preservative

ACQ Protect® treated wood is a copper plus quat system that provides the same level of protection to wood against decay, rot and termite attack as other preservatives without the use of chromium and arsenicals. ACQ Protect® is approved for use by the EPA and does not contain chemicals with California Prop 65 warnings.
The main active ingredient in ACQ is Copper, which has long been established as the most cost effective preservative component used in timber preservation. A quaternary compound, commonly used in household and industrial disinfectants and cleaners, acts as a co-biocide in the ACQ preservative, providing additional protection from fungi and insect attack that copper alone would not control. Copper and quat solutions similar to ACQ, are used for the control of fungi and bacteria in swimming pools and spas.

ACQ-D Protect® Applications

ACQ-D Protect® can be used for any construction project and is particularly suited for applications such as decking, playgrounds, walkways, benches, outdoor tables and chairs, fencing, gazebos and landscaping, where long-term protection against decay and termites is a priority.

acq application table

Nails, Fasteners and Fittings

For the best results, hot-dipped galvanized or stainless steel fasteners and fittings are recommended. A list of manufacturers that recommend the use of their fasteners with ACQ-D Protect® is available upon request from your material suppliers. Direct contact of ACQ Protect® treated wood with aluminum fasteners and fittings is not recommended.

Painting and Staining or Natural Weathering

ACQ Protect® pressure treated wood can be painted or stained to match most outdoor color scheme. High quality oil and latex based paints and stains are recommended. Water repellant coatings can be applied to enhance the long-term weathering performance. It is important that the wood is dry and free from surface deposits prior to applying any coating. Left uncoated, or with clear water repellant coatings, ACQ-D Protect® will initially weather to a natural brown color, eventually turning gray following long-term exposure to the sun.


Disposal of large quantities of ACQ-D treated wastes or spent timber at the end of its lifecycle has been traditionally through controlled landfill sites. Such sites are lined to make them impervious in order to prevent losses to the water table and they are covered to prevent rainfall washing out any contained potential toxicants. These controlled sites handle a range of waste materials potentially more noxious than that posed by ACQ-D treated timber, e.g. paints, car batteries, etc. Today, landfill sites are becoming more uncommon and disposal of waste materials is becoming economically unattractive. The wood preservation and timber industries are therefore researching better ways of dealing with treated timber waste, including ACQ-D treated material. Visit Western Wood Preserving Institute (WWPI) website at for a current list of approved landfill sites where Treated Wood Waste is accepted.

Handling and Safety Information
acq1ACQ-D Protect® pressure treated wood is easy to work with, requiring no special precautions other than routine wood working safety procedures. When sawing, drilling, ripping, sanding or manufacturing, the following safety precautions should be followed:

  • Gloves should be worn to protect against splinters and abrasions
  • Dust masks should be worn when sawing, drilling, ripping, sanding or manufacturing any wood to reduce the inhalation of wood dusts
  • Appropriate eye protection should be worn to reduce the potential for eye injury from wood dust or particles and flying debris during machining and construction
  • Wash thoroughly with mild soap and water after working with any treated wood product
  • Wood scraps should be disposed of by burial in accordance with applicable federal, state, and local regulations




Safety Data Sheet
ACQ Protect
How To Read an End Tag
Specification Guide
ACQ Waranty