| 摘要 |
A novelty ball is disclosed which is formed from a spherical shell of high density elastomeric polyurethane polymer. The polyurethane shell has a wall thickness sufficient to return the shell to its original shape following deformation. In one embodiment, the interior of the shell is hollow whereas in a second embodiment, the hollow interior is filled with a low density polyurethane foam. A flavoring can also be added to the polyurethane which is appealing to animals, such as dogs. The shell has a hardness ranging between approximately 35 and 60 Shore D as measured by the ASTM (American Society of Testing Materials) that 2240; an ultimate tensil strength between approximately 20 and 25 MPa (mega pascals) measured by ASTM test D412; an ultimate elongation ranging between approximately 500 and 600%; a tensil strength between approximately 6.9 and 16.5 MPa at 100% elongation; and between approximately 10.3 and 19 MPa at 300% at 50% elongation; a tear strength of between approximately 80 and 140 kN/m (kilo Newtons per meter) measured by ASTM Test D 624-DieC; and a compression set of between approximately 30% and 40% at 70 DEG C. over a 22 hour period.
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