TS 3635

TS 3635 is a terminology standard for fibre building boards, focused on how the product is defined and how its types are classified. It does not set out manufacturing rules or performance requirements; instead, it establishes a common naming and grouping framework so the same material is described consistently in technical documents, trade communication, and product records.

Why definition and classification matter for fibre boards

In general technical usage, fibre building boards belong to the family of engineered wood-based panels made from wood fibres consolidated into sheet form. Different board types may vary by density, surface structure, intended application, and production route. A terminology standard helps distinguish closely related board categories, which is important when specifications, drawings, catalogues, and quality documents must refer to the same material without ambiguity.

What this document covers

• Definitions for fibre building boards.
• Classification of fibre building boards.
• Because it is a terminology and classification document, it does not describe product performance requirements or test methods.
• It is associated with ISO 818:1975 as the source standard.

In broader industry practice, standards of this kind support consistent vocabulary across markets and organisations. For users of wood-based panel products, TS 3635 provides a shared conceptual basis for identifying and sorting board types, while leaving strength, dimensional tolerances, and fitness-for-use issues to other documents where applicable.