Harbor Screening Tests of Marine Borer Inhibitors - Iii.

Abstract

The Laboratory is exposing wood panels impregnated with various materials th determine their resistance to attack by marine borers. This report lists the results of harbor tests of treated panels removed from exposure between 1 August 1959 and 15 August 1960. It also lists all treatedpanels which haveibeen exposed for one year or more and which have shown no attack or very slight amounts of attack. Treatments which have been exposed for less than one year are not reported unless they have failed and have been removed from test.When impregnated into wood test panels, creosote, coal tar, 70-30 creosotecoal tar solution, tributyltin coconut fatty acid salt, and tributyltin oxide, in general, give protection against Martesia and teredine (Teredo) attack but not against Limnoria. Inorganic copper and mercury compounds, phenylmercuric oleate, dibenzofuran, fluorene, and toxaphene protect against Limnoria attack only. Resistance to Limnoria attack, without adversely affecting resistance to Martesia and Teredo, is increased by the addition to creosote of aluminum, copper, or manganese oxinates, and dieldrin, phenylmercuric chloride, or phenylmercuric oleate; by the addition to coal tar of copper naphthenate or phenyl-mercuric oleate; and by the addition to a 70-30 solution of creosote-coal tar of copper naphthenate, dieldrin, endrin, phenylmercuric chloride, or phenylmercuric oleate. Combinations of copper compounds or complexes plus oxine or polyvinylmethyl ether-maleic anhydride, and dieldrin or endrin plus malachite green oxalate are resistant to Limnoria and teredine borers but not to Martesia.Copper naph thenoee plus linseed oil is resisting all types of borer attack both at Port Hueneme and Pearl Harbor. Nickel sulfate plus sodium monohydrogen arsenate, and-tributyltin oxs.,$e plus ammonium'sulfide show promise but have only been exposed for one year at Pcrt Hueneme. The tropical woods afambeau, antidesma pulvinatum, and greenheart show good resistance to borer attack. Greenheart panels extracted with various solvents, except those which had been extracted with boiling sea water, also are ccntinuing to show borer resistance.These results together with results obtained from current and future laboratory toxicity tests will Le used in developing additional wood treatments. Panel testing will be continued to screen these treatments under harbor exposure conditions. Emphasis will be placed on the addition to creosote and creosote-coal tar solutions of materials which are toxic to Umnoria. INTRODUCTIONThe destructive action of marine boring organisms on structures submerged in sea water presents a major maintenance problem to Navy shore installations. The replacement of wood piling destroyed by these organisms is a costly operation, and, in addition, moy remove the pier from operation during the reconstruction period.Under Project Y-R005-07-007, the Chief, Bureau of Yards and Docks, requested the Laboratory to investigate methods and materials for reducing or preventing borer attack on wooden marine structures ...

Harbor Screening Tests of Marine Borer Inhibitors - Vi

“…Some results which have been reported previously 6 , 7, 9, 10, 12 are included in this report for the purpose of comparison.…”