Copper Care Wood Preservatives, Inc. can help you get the copper naphthenate you need. Cu-Nap Concentrate and ready-to-use Tenino Copper Naphthenate are available in a wide variety of packaging options: two-hundred and seventy gallon totes down to pint bottles. Pints of Tenino for utility linemen. Quart containers of ready-to-use Tenino stocked by retailers and 55 Gallon drums of Cu-Nap Concentrate for post treaters - Copper Care has Tenino and CuNap Concentrate in packaging that works for you.

Copper Naphthenate is an oil-borne wood preservative classified as general use by the United States Environmental Protection Agency (EPA) under the Federal Insecticide, Fungicide and Rodenticide Act (FIFRA). Copper Care Wood Preservative’s Tenino, and Cu-Nap concentrate products are EPA-registered “general use” preservatives and have been standardized for use by the American Wood Protection Association (AWPA). Creosote and pentachlorophenol are used in pressure treatment for utility poles, bridge timbers and railroad crossties. Copper naphthenate is the only non-restricted use product in this market. Copper naphthenate has a low mammalian toxicity profile.




USDA Forest Service Forest Products Laboratory studies document long-term performance. American Wood Protection Association (AWPA) Standards ensure peer review and qualify intended applications.


Formosa Subterranean Termite Protection


University of Hawaii in studies demonstrates Copper Naphthenate can provide effective protection against Formosan Termites. To achieve effective, long-term protection against termites, treat to the required AWPA Use Category 4C requirements.


Time Tested


Copper Naphthenate has been used as a wood preservative for over one hundred years with many applications for use, including field boxes, benches, flats, fence posts, water tanks, canvas, burlap, ropes, nets, greenhouses, utility poles, crossarms, and wooden structures in ground contact and above ground contact.


Reveals Natural Wood Grain


The bright green color of wood freshly treated with copper naphthenate will become brown in outdoor exposure. Multiple studies demonstrate no excessive corrosion of hardware and fasteners due to contact with the preservative.

Peeled pine fence posts treated with Cu-Nap Concentrate copper naphthenate quickly faded from an inital green to natural copper tone after a briefexposure to the elements

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Nisus CorporationOsmose Utility ServicesAmerican Wood Protection AssociationNational Association of Home BuildersInternational Code Council


American Wood Protection AssociationNational Association of Home BuildersInternational Code Council