TS EN ISO 7345

TS EN ISO 7345 is a terminology standard for thermal insulation, bringing together the physical quantities used in the field and their definitions. Documents of this kind are essential for keeping technical language consistent across design, testing, calculation, and specification work, especially where heat transfer and insulation performance are discussed.

Why these definitions matter in thermal insulation

Thermal insulation is used in buildings, equipment, piping, and industrial systems to reduce heat flow, control temperatures, and support energy efficiency. This standard is concerned with the vocabulary behind that work rather than with product requirements or test procedures. In general technical terms, it helps distinguish concepts such as thermal resistance, thermal conductivity, and thermal transmittance, which are related but not interchangeable.

As a terminology document, it provides a common basis for other standards and technical references that rely on precise definitions. That is particularly important in thermal engineering, where the same word can be used loosely in everyday language but must have a fixed meaning in calculation, measurement, and comparison. The withdrawn edition represented by this listing remains a useful reference for understanding how the subject is structured conceptually.

This is the withdrawn version of the standard, but its subject area remains directly relevant to anyone working with insulation data, heat-transfer terminology, or energy-related technical documentation.

• Names and definitions of physical quantities used in thermal insulation
• A shared vocabulary for insulation engineering and heat transfer
• Clear separation between related but different thermal terms
• Terminology support for measurement, specification, and comparison