Product Display For compressive stress with temperatures borosilicate circular sight glass up to max 280 degrees Celsius. In a toughened form, temperatures up to 315 degrees Celsius are possible whilst annealed glass may be used up 400 degrees Celsius continuously with a short term maximum of 500 degrees Celsius. Gasket Sheet, Gauge Glass, Glass Tube, Level Gauge, Quartz Glass, Sight Glass, beater paper Product Data Grade: Industr…