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Gelatin encapsulated fumigants for wood fumigations: Current research status
1985 - IRG/WP 3336
The fumigants chloropicrin (trichloronitromethane) and methylisothiocyanate (MIT) were encapsulated in gelatin as an alternative to liquid fumigant treatments for control of decay fungi in wooden utility poles. Gelatin-encapsulated MIT was stored for over 2 years under dry conditions without significant fumigant leakage. Gelatin encapsulated MIT and chloropicrin were released from capsules when placed in wood above the fiber-saturation point, although capsules were more permeable to MIT than chloropicrin. In field treatments, the addition of small quantities of water along with capsules was sufficient for fumigant release. Encapsulated MIT and chloropicrin treatments effectively reduced decay fungus populations in Douglas-fir utility poles.
A R Zahora, M E Corden, J J Morrell

Field evaluation determining the toxic effect and diffusion properties of Impel, Improsol and TBTO-capsules in L-joints (spruce) for pretreatment application
1991 - IRG/WP 3641
Bonded joints (L-joints and T-joints) are especially at risk from water absorption (rain, condensation) over bare, unprotected radial wood surfaces (joggle joints). It is therefore quite certain that lasting protection against fungi attack cannot be guaranteed in the long term if the surface of coating is damaged. Therefore, in a field investigation, using L-joints (spruce) over a total period of 44 weeks, an attempt should be made to provide "inner protection" or "preventative protection" by using fungicides in the form of protective capsules (Impel-Rods; Improsol-Fluorin-Woodpil and TBTO-glass ampulle) additionally to the customary surface protection of the wood. Moisture distribution, diffusion and effectiveness of chemicals to protect the wood against bluestain, mould and decay fungi was evaluated. Although the products showed both completely different diffusion qualities and a wide difference in the property of hindering fungus growth, the use as preventive protection would possibly represent a completely new method of prolonging the service life of wooden window frames.
R Gr√ľndlinger, K Messner, O Janotta