TS 6876

TS 6876 is a terminology standard that defines the physical quantities and definitions associated with mass transfer in thermal insulation. Standards of this kind help engineers, specifiers, and technical writers use the same terms with the same meaning when discussing moisture movement, vapour transport, and related mass-transfer phenomena, which improves consistency in calculations, documentation, and comparison of insulation systems.

Why mass-transfer terms matter in thermal insulation

Thermal insulation does not only manage heat flow; it also interacts with the movement of water vapour and other mass components through building layers. Condensation risk, moisture accumulation, and changes in material performance over time all depend on a correct understanding of mass-transfer concepts. Standardised quantities and definitions provide a common technical language for design, analysis, and reporting in this field.

What this standard covers

• Physical quantities related to mass transfer in thermal insulation
• Definitions and terminology for those quantities
• Consistent interpretation of concepts used in the thermal insulation context

The source standard for TS 6876 is ISO 9346:1987. It should therefore be understood as a reference vocabulary document rather than a test method or a performance-limit standard. The standard has been withdrawn, but as a terminology reference it remains useful for interpreting older technical literature and for comparing expressions used in the same subject area.