COMPARISON OF WOOD PRESERVATIVES IN STAKE TESTS (1965 PROGRESS REPORT).
FOREST PRODUCTS LAB MADISON WIS
Pagination or Media Count:
Test stakes of southern pine sapwood 2 by 4 inches nominal by 18 inches in size were treated by pressure and nonpressure processes and installed in decay and termite exposure sites at various times since 1938 at the Harrison Experimental Forest, Saucier, Miss., Madison, Wis., Bogalusa, La., Jacksonville, Fla., and the Canal Zone, Panama. Also included in the tests at Saucier, Miss., are smaller pine stakes and those of treated and untreated plywood, modified woods, laminated paper plastic, and pine infected with Trichoderma mold. Southern pine untreated control stakes have had an average life of about 1 year in the Canal Zone, 2 to 3 years in Mississippi, Florida, and Louisiana, and about 6 years in Wisconsin. Superficial treatments by 3-minute dipping and brushing with preservatives such as coal-tar creosote and petroleum oils containing copper naphthenate, zinc naphthenate, phenyl mercury oleate, and pentachlorophenol added a few months to 4 years to the life of the untreated stakes. Some waterborne preservatives provided less protection to the stakes than the standard preservative oils, such as coal-tar creosote and pentachlorophenol solutions, when preservative retentions have corresponded to those in commercial use. Other waterborne preservatives, during the time they were in test, produced results that compare favorably with those from the standard preservative oils. Author