TS EN ISO 7345

TS EN ISO 7345 is a terminology standard for thermal insulation that organises the physical quantities used in the field together with their definitions, symbols and units. Its role is to make technical language consistent, so that the concepts used to describe insulation performance mean the same thing across specifications, calculations and reports.

Why quantities and symbols matter in thermal insulation

Thermal insulation relies on a connected set of concepts such as heat flow, thermal resistance, thermal conductivity, conduction, convection and radiation. In general technical practice, these terms are easy to mix up unless their definitions and symbols are standardised. A terminology document like this helps engineers, test laboratories and designers communicate with less ambiguity.

According to the supplied scope, this standard defines the physical quantities used in thermal insulation and gives the corresponding symbols and units. It is therefore about the conceptual framework of the subject rather than product limits or a specific test method. That makes it especially useful as a reference point for documentation, calculation and data exchange in the insulation domain.

• Naming and defining physical quantities used in thermal insulation
• Providing the corresponding symbols
• Assigning the relevant units
• Supporting consistent terminology across the field