ISO 8307:2018 pdf download.Flexible cellular polymeric materials-Determination of resilience by ball rebound.
ISO 8307 specifies a method for determining the resilience by ball rebound of flexible cellular polymeric materials.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of ISO 8307. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 23529, Rubber — General procedures for preparing and conditioning test pieces for physical test methods
3 Terms and definitions
For the purposes of ISO 8307, the following terms and definitions apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsin2 olatform: available at
The rebound test apparatus (see Figure 1) shall consist of a vertical transparent tube, of inside diameter 30 mm to 65 mm. A steel ball of diameter 16 mm ± 0,5 mm and mass of 16,8 g ± 1,5 g is dropped vertically on the test piece through the tube from a height of 500 mm ± 0,5 mm using a magnet or other suitable device. The steel ball shall be released so that it falls without rotation and is effectively centred.
Measurement errors can arise if the tube is not held in a vertical position, and measurements might be invalid due to contact of the rebounding ball with the inner surface of the tube. It is therefore important to use a spirit level or similar device to ensure that the tube is mounted at right angles to the rigid baseplate, and that the baseplate itself is horizontal.
6 Test pieces
6.1 The test pieces shall have plane, parallel top and bottom surfaces.
6.2 The test pieces shall consist of the entire product sample or a suitable portion of it, except that in no case shall the thickness be less than 50 mm or the area less than 100 mm x 100 mm. Test pieces less than 50 mm thick shall be plied up, without the use of cement, to a minimum of 50 mm. For moulded products, the top skin shall be removed.
Thicker test pieces can be used to avoid spurious results, which can occur with very soft materials due to the influence of the baseplate.
NOTE The minimum test piece thickness of 50 mm cannot be sufficient for very soft materials: if spurious results are obtained, a thicker test piece can be used. Very low density materials can also cause problems due to rebound of the test piece itself. With multiple-ply test pieces, slipping can occur between the plies. This problem can be overcome by using the largest possible area of the test piece.ISO-8307-2018