ITEM NAME:60mm Glass tissue petri dish culture dish culture plate with cover JR.Be made of G3.3 borosilicate glass. This borosilicate glass with low linear coefficient of expansion is ideal choice for fabricating laboratory glassware. Annealing Point ------560 ¡Ãƒ ¦. Softening Point ------820 ¡Ãƒ ¦.