Profile: Critical Glass Corporation is a manufacturer of borosilicate and quartz critical orifices. Our custom critical orifices with flow rates from 5 ml/min to 5 L/min, are suitable for all industries. Our borosilicate or quartz critical orifice regulates the critical flow of gases for almost any application in any industry. Our borosilicate and quartz critical orifice is suitable for all emission testing equipment. Our double ended orifice is suitable for any application under 450°F. Our products are used in aerospace, marine, automation, emission testing, petroleum, and chemical process industries.