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PYREX® Glass Test Tubes, Corning®
Corning® PYREX® glass test tubes are made from special glass tubing for optimum wall thickness. Test tubes are well annealed, resistant to heat and chemically stable. The beaded rims of these test tubes are fire-polished and smooth. Test tubes have white marking spot for easy sample identification. Material: Borosilicate Glass Code 7740. Corning 9800.