disposal often exceed the purchase cost by a considerable margin. Materials that are to be disposed of as hazardous must be placed in sealable containers. Containers should be filled, leaving a headspace for expansion of the contents. Often the original container is perfectly acceptable. If you routinely generate significant quantities of compatible solvents, bulking of waste in five-gallon carboys provided by EHS may be practical. Plywood is made by gluing thin sheets of wood together with either urea-formaldehyde glues or phenol-formaldehyde glues . Composition board, for example particle board, is made by gluing wood dust, chips, etc. together with urea-formaldehyde resins. The materials can emit unreacted formaldehyde for some years after manufacture, with composition board emitting more formaldehyde. In addition, heating these materials or machining them can cause decomposition of the glue to release formaldehyde. 4. Some hardwoods can cause hypersensitivity pneumonia , and frequent attacks can cause permanent lung scarring . Examples of these highly toxic woods include giant sequoia, cork oak, some maple woods and redwood. 2. Alcohol and acetone are slightly toxic solvents by skin contact and inhalation; benzine and turpentine are moderately toxic by
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