Metal scrapers have always been highly suspect for causing scratches. As a result, it has been occasionally suggested that the use of plastic scrapers would be a safer alternative. In an attempt to test this theory extensive testing on new clean tempered and annealed glass samples was done. These tests showed most tempered glass with excessive fabricating debris were scratched by the plastic scraper as well.
The experiments also showed that as a result of their use on the defective glass, the plastic scrapers were contaminated with embedded fabricating debris. If this scraper was then used on quality glass, it would result in scratching every window it touched. These tests conclusively showed that the use of plastic scrapers is a destructive alternative to safe metal scrapers.
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