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Release: May 18, 1998


NGK Insulators, Ltd. (President: Masaharu Shibata, Head Office: Nagoya) and Ikebukuro Horo Kogyo Co., Ltd. (President: Yutaka Ogawa, Head Office: Tokorozawa, Saitama Prefecture) have developed the world's first glass-lined apparatus preventing accumulation of static charge and have conducted field tests since February, 1998. Since the results from the field tests were favorable, they have started full-scale sale of such products.

These glass-lined apparatus are comprised of a steel plate which is layered with high silicic acid glass, which is superior in chemical resistance and heat resistance. Therefore, these apparatus have been widely used for production equipment, such as reactors and tanks, in the chemical and pharmaceutical industries. On the other hand, an undesirable characteristic of glass lining is its high insulation. When organic solvents, such as benzene and n-hexane are agitated in a glass-lined container, static electricity of several tens of thousands to several hundreds of thousands volts is generated, which, in the worst case, might lead to an electrostatic explosion.

The newly developed glass lining achieves higher electrical conductivity by layering platinum fibers, which have low volume resistivity and superior corrosion resistance, three dimensionally within the glass lining. The volume resistivity of this glass lining, less than *10^6Ωcm - 10^8Ωcm, results in higher electrical conductivity compared with that of usual glass linings (*10^12Ωcm - 10^14Ωcm). In addition, according to "Recommended Practice for Protection against Hazards arising out of Static Electricity in General Industries" (revision, March 1988) issued by Technology Institution of Industrial Safety, Japanese incorporated association, the low volume resistivity of newly developed glass lining is classified under the category of "almost non-electrified" (less than *10^8Ωcm). As far as chemical resistance and heat resistance are concerned, the newly developed glass lining still keeps the same properties.

This year the newly developed glass linings are applied to reactors and tanks of up to 5,000 liters and in the year 1999, they are planned to be employed for all products (maximum 60,000 liters). NGK is targeting total sales of 1 - 1.5 billion yen in three years.

The numbers with *marks show as follows:

  • 10^6Ωcm - 10^8Ωcm (ten to the sixth power Ωcm - ten to the eighth power Ωcm)
  • 10^12Ωcm - 10^14Ωcm (ten to the twelfth power Ωcm - ten to the fourteenth power Ωcm)
  • 10^8Ωcm (ten to the eighth power Ωcm)

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