IEEE 668-1987

IEEE 668-1987 is a technical standard for electrical heating applications used with melting furnaces and forehearths in the glass industry. It addresses a specialized part of furnace heating practice where temperature control, process stability, and equipment performance are closely linked. For operators, engineers, and buyers working with glass melting systems, this document helps define a clearer basis for design and evaluation. IEEE 668-1987 is an inactive English-language standard, but it remains relevant for understanding historical practice in industrial heating applications.

Overview of IEEE 668-1987

This standard focuses on the electrical heating requirements and recommended practice associated with melting furnaces and forehearths used in glass production. IEEE 668-1987 is tied to power, energy, and industrial applications, making it relevant to furnace heating circuits, thermal control considerations, and related engineering decisions. Its purpose is to support more consistent application of electrical heat in glassmaking equipment, where uneven heating can affect product quality and process reliability. It is most useful when comparing legacy designs or reviewing established technical expectations.

Typical use cases

IEEE 668-1987 is commonly consulted when specifying or reviewing electrical heating arrangements for glass melting furnaces and forehearths. It may support engineering teams working on furnace upgrades, thermal zoning, or heat distribution in glass plant equipment. The standard can also be useful in procurement and specification work where heating performance, control methods, or equipment compatibility need to be assessed. In practice, it fits operations that depend on stable molten glass handling and controlled temperature conditions across the furnace-to-forehearth path.

Why it matters

For glass industry heating systems, IEEE 668-1987 helps provide a common technical reference for design and evaluation. That matters because electrical heating in melting furnaces and forehearths can influence consistency, energy use, and operational risk. Using a recognized practice can improve communication between design, maintenance, and purchasing teams, especially when reviewing legacy equipment or comparing supplier proposals. It also supports more disciplined compliance checks and helps reduce ambiguity in specification and testing.

• Electrical heating for glass melting furnaces
• Forehearth temperature control considerations
• Legacy glass industry engineering reference
• Specification and procurement support
• Operational consistency and risk reduction