Properties of borosilicate sight glass 3.3
Sight glass is a good anticorrosion material. The international standard ISO3585 "the performance of borosilicate sight glass 3.3" is the material standard for manufacturing glass mirror chemical equipment. Because the linear expansion coefficient of this sight glass is 3.3 * 10-6K-1, so it is called "3.3 glass" for short. This sight glass is invented by Xue Liwen, a Corning Glass Corporation (CORNING) researcher in 1915, and has obtained the invention patent. Thesight  glass in the United States called "Pyrex glass," (PYREX) PYREX is a trademark of Corelle products. After the failure of the Pyrex glass patent, glass has been widely used in many countries. Over the past 70 years, many experts and scholars to study a new glass, Pyrex sight glass more than performance, without success. The characteristics of Pyrex sight glass is introduced in the sight glass three oxidation two boron (B2O3) improved the thermal stability and mechanical properties of sight glass. Today, the whole world with Pyrex glass made of corrosion resistant chemical equipment and fittings, laboratory glass instrument.
Glass chemical anticorrosion equipment and fittings were produced in Britain and Germany in the late 30s and early 40s. In the UK, the small sight glass instrument used in the laboratory is magnified, and it has become a large sight glass chemical equipment for production. Germany, unlike Britain, made the equipment used in chemical production directly with glass mirrors, and Germany was successful. So far, Schott (SCHOTT) in Germany is still the world's largest Equipment Manufacturing Company of glass chemical industry. Quirke and QUICKFIT in the United Kingdom and Corelle (CORNING) in the United States also developed glass chemical equipment in fifty years. In 70s, they bought the British Quirke phenanthrene company, and Quirke Fei became a subsidiary of Corelle.

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