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 Copper Naphthenate. Copper naphthenate is a mixture of naphthenic
acids combined with copper salts to form a dark green mixture. It is not a restricted use pesticide
and it is not considered a hazardous waste.
Copper naphthenate has a high toxicity to wood destroying fungi. For brushing and other
superficial methods, a copper content of one to two percent (approximately 10 to 20 percent copper
naphthenate) is usually required. The solution will generally impart a pronounced green color to the
wood.
Zinc Naphthenate. Zinc naphthenate is similar to copper naphthenate,
but it is not as toxic to wood destroying fungi. It is lighter colored and does not impart the charac-
teristic green color of copper naphthenate.
Copper-8-Quinolinolate. Copper-8-Quinolinolate is green in color,
odorless, is toxic to a wide range of wood destroying organisms and has a low toxicity to humans
and animals. It is permitted by the U.S. Food and Drug Administration for treatment of wood used
in food handling. It is used to treat commercial refrigeration units, fruit and vegetable baskets and
boxes, greenhouse flats, water tanks and others. It has also been used on non-wood materials such
as webbing, cordage, cloth, leather and plastics.
Bis (Tri-N-Butyltin) Oxide (tributyltin oxide or TBTO). This
preservative has a lower mammalian toxicity, less skin irritation and better paintability than penta.
TBTO is not effective against decay when used in soil contact and is only recommended for above
ground use such as millwork.
5.3.4.2 Water Borne Preservatives. Water borne salt preservatives produce
a dry to the touch (not oily), paintable surface, free from objectionable odor. Treated wood may
show shades of brown or green color depending on the preservative and wood species. Water borne
preservatives afford little protection to mechanical wear.
The common water borne preservatives are as follows:
Acid Copper Chromate (ACC) (CelcureR).
Ammonical Copper Arsenate (ACA) (ChemoniteR). This preservative is used most
commonly with refractory species such as Douglas-fir.
Ammonical Copper Zinc Arsenate (ACZA).
Chromated Copper Arsenate (CCA) (Type A, B, and C). Type A (Greensalt) is high in
should not be used in treatment of Douglas-fir.
Chromated Zinc Chloride (CZC).
Trademark M&T Chemical Co.
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