High performance controlled release ampule containing a fumigant for a wooden structure

A method for long-term protection of a wooden structure from decay comprising:

• inserting a fumigant in a sealed container into said wooden structure, said container having walls comprising a fiber-free, heat-sealable organic polymer ampule, which is a single layer tube closed at both ends that is permeable to but otherwise inert to said fumigant, said walls allowing said fumigant to be retained while permitting controlled release of a sufficient amount of said fumigant to diffuse at a rate of fumigant loss of between about 1 and 15 mg/day through said walls to protect said wooden structure from decay for a period of time of up to at least 7 years or for up to about 30 years, with the proviso that no external force, other than ambient pressure and temperature, is present to release said fumigant from said sealed container.

A method for long-term protection of a wooden structure from decay comprising:

• inserting a fumigant in a sealed container into said wooden structure, said container having walls of an organic polymer ampule, which is a fiber free, heat sealable single layer tube which is sealed at both ends, that is permeable to but otherwise inert to said fumigant, said walls allowing said fumigant to be retained while permitting controlled release of a sufficient amount of said fumigant to diffuse at a rate of fumigant loss of between 1 and 15 mg/day through said walls to protect said wooden structure from decay for a prolonged period of time, which prolonged time is obtained by selection of a polymer container and a weight of fumigant, with the proviso that no external force, other than ambient pressure and temperature, is present to release said fumigant from said container.