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Gold/Mining/Energy : FASC (First American Scientific Corp) -- Ignore unavailable to you. Want to Upgrade?

To: SnakeInATuxedo who wrote (283)	6/19/1998 1:53:00 PM
From: eric deaver	Read Replies (4) \| Respond to of 972

Re: Drywall from web page - Drywall, Sheetrock, Gyproc, Wallboard. These are brand names for the most common interior wall panel in the world. A typical house (2,000 sq. ft.) contains an average of 130 sheets of drywall, totalling approximately 10,000 lbs. What's happening to all that drywall when the life of the house is over? Currently, most waste drywall from the construction and renovation industry finds its way into landfill sites. The cost for dumping drywall in the United States ranges from US$50 - 90 per ton. That is, if your municipality even allows the dumping of drywall into landfills. More and more, municipal and regional governments are banning completely the dumping of any drywall into local landfill sites. This ban exists for one very clear reason: hydrogen sulfide, which is toxic and odorous is formed when calcium sulphate (gypsum) breaks down under anaerobic (oxygen-free) conditions, such as those created when tons of drywall are mounded into a large stockpile. The rest of the waste drywall is recycled using conventional technology (ground up and dehydrated). Uses for this type of product are restricted by the fact that a typical sheet of drywall is at most only 85% gypsum, with paper comprising another 14%. The remaining 1 per cent is usually a combination of potassium sulphate, starch, boric acid, and crystalline silica. Most waste drywall has been coated with paint, fire retardant, water resistant coating, and/or a host of other possible chemicals, all adding to the toxicity of ground, recycled drywall. Some uses of low-toxin recycled drywall include mushroom compost additive forestry and mine reclamation agricultural soil amendment animal bedding At present, new drywall panels contain only 6 - 8% recycled gypsum. Kinetic Disintegration Technology, when used to process waste drywall, separates the gypsum from the other components of the drywall, which would allow a recycled gypsum content of up to 20%, according to New West Gypsum.