Seven alternative antisapstain formulations containing four different active ingredients were field tested during the summer and fall of 1981. The test was designed to evaluate the potential long term effectiveness of PQ-8 (Chapman Chemical Co.) containing copper-8-quinolinolate, Busan 30 (Buckman Laboratories) containing 2-(thiocyanomethylthio)benzothiazole, BL2398 (Buckman Laboratories) containing a mixture of 2-(thiocyanomethylthio)benzothiazole and methylene bis-thiocyanate, Xyligen K30F (BASF) containing the potassium salt of N-nitroso-N-cyclohexyl hydroxylamine and three formulations, Polyphase (Troy Chemical Corp.), Woodbrite NTX (Van Waters & Rogers) and Argosy (Aero-Pak Ltd.) containing 3-iodo-2-propynyl butyl carbamate as active ingredient. The tests were evaluated after three months and again after five months. Protection of hemfir lumber comparable to a 0.65% w/w chlorophenoxide treatment was achieved with 0.8% active PQ-8, 2.0% active Busan 30, 0.8% active BL2398, 1.0% active Polyphase, 1.0% active Woodbrite NTX and 1.0% active Argosy treatments. Xyligen K30F treatment at the 1.0% active level was ineffective.

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