... , blue, green, yellow, amber, pink, purple, red Ground glass joints of borosilicate 3.3 pyrex, are used in laboratories to ... commonly available parts. For example, a , , and with ground glass joints may be rapidly fitted together to a reaction mixture. This ... the inside and open at the ends, except for stoppers.Joint types: Conically tapered jointsBall-and-socket joints pyrex borosilicate glass ground ...