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Washington Post, April 21,
1996,
“Vinyl frames are not strong. Vinyl frames get soft and warp. They are
dimensionally unstable causing warping, cracks, air leaks which cause thermal
failure and glass fogging.”
US Dept. of Energy-National
Renewable Energy Lab, October 1994,
“Vinyl material tested warped,
shrunk and twisted. Vinyl cannot withstand extreme temperature fluctuations.”
US Dept. of Energy-NREL,
August 30, 1996,
“Vinyl frames are not strong or rigid, which limits the weight of
glass that can be used. In addition, vinyl frames can warp, soften twist and
bow.”
Environmental Building News,
1999,
“We evaluated all the framing material used in windows and advised to avoid 100%
vinyl window frames because of their durability problems. Vinyl windows have
only been on the market in the US for 15 or 20 years. Many of these products
won’t even last a decade.”
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