ISO 8307-2018 pdf free.Flexible cellular polymeric materials – Determination of resilience by ball rebound. 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. 7 Number of test pieces Three test pieces per sample…