Thermal insulation products must have certain mechanical properties according to the use to be made of the product. Consequently, the following mechanical properties can be determined.
- Shear behaviour for insulating products that are part of External Thermal Insulation Composite Systems (ETICS) where the product is subjected to tangential forces.
- Compression and compression creep for products subjected to loads (floors and roofs).
- Tensile strength perpendicular to faces when the product is subject to adherences stresses and when the intrinsic weight or suction caused by wind subjects the product to tensile forces.
- Bending strength in order to guarantee good cohesion of the insulation product (EPS) when handling the product.
- Parallel strength parallel to faces to guarantee the physical integrity of the panels and to verify the stress resistance in use.
- Compressibility when the product guarantees a certain degree of elasticity, e.g. in stress applications such as floating flooring.
- Point load resistance when the product is subjected to localised stresses.
- Resistance to freeze / thaw cycles in products that are subjected to the effects of freezing. After thermal treatment the variation of the resistance to compression is assessed.
Thermal insulation materials to test:
- Expanded polystyrene
- Extruded polystyrene
- Mineral wool