Pyrex® Ribbed Watch Glass Beaker Covers
PYREX® ribbed watch glass beaker covers are designed for use as covers for PYREX® beakers and all other brands of beakers. Ribs are molded into the glass so that they can't pop off as they do when cane is sealed to standard watch glasses. These glass beaker covers permit the escape of excess vapor and eliminate the risk of contamination from dropped hooks or props. Watch glass beaker covers meet EPA requirements for methods 3005, 3010, and 3020. Material: PYREX®Borosilicate Glass Code 7740. Glass Style: Ribbed. Top Style: Heavy Duty Rim. Available in diameter sizes of 75mm, 100mm & 125mm.