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 the definitions attached to them. Standards of this kind help align terms such as heat flow, thermal resistance, thermal conductivity and related quantities so that they are used consistently across engineering documents, calculations and product information.

Why thermal-insulation terminology matters

Thermal insulation is used to reduce unwanted heat transfer in buildings, industrial plant and equipment. Many of the quantities involved sound similar but describe different physical ideas: heat flow refers to energy crossing a boundary, thermal conductivity describes a material’s tendency to conduct heat, and thermal resistance expresses opposition to heat transfer in a construction or layer. The purpose of this standard is to organise the definitions of such terms and reduce the risk of misunderstanding.

What this standard covers

Based on the title and scope information provided, the standard focuses on naming and defining physical quantities associated with thermal insulation; it should not be read as a product specification with test methods or performance limits. In general technical use, this kind of document helps separate closely related quantities and supports consistent terminology when describing thermal properties.

• Defines core quantities related to heat transfer in a common technical language.
• Clarifies the distinction between key terms used in thermal-insulation engineering.
• Supports consistent wording in technical communication and documentation.
• Helps align terminology across building, process and equipment insulation applications.