Borosilicate insulated glasses The glasses used for making these instruments are or optical properties (insulated glazing, anti-reflective borosilicate (low expansion, ar to pyrex, duran). & Micazo Bulllzz Borosilicate insulated glasses The glasses used for making these instruments are or optical properties (insulated glazing, anti-reflective borosilicate (low expansion, ar to pyrex, duran).