How to test Rubber Chandrasekaran, in Essential Rubber Formulary, 2007 7.3.1 Hardness. It is easily machined with conventional metal working equipment and can be machined to very close tolerances. PDF Shore Hardness Scales - TPE Plastic Polymer Suppliers Thus, if you need a rubber or O-ring durometer that feels like a running shoe sole, review our rubber hardness chart below, then pick Shore 70A. Polyurethanes are most commonly used around the 80-95A shore hardness range due to a good balance of mechanical properties. This makes it more likely to bend and flex with an impact. It is easily machined with conventional metal working equipment and can be machined to very close tolerances. What Is the Shore Hardness Scale? - BJB Enterprises Inc There are three most popular Shore hardness scales: Shore 00 - Used for measuring gels and rubbers that are very soft in nature. Use of the instrument in combination with a test stand is recommended for laboratory tests. The most commonly used is the static load intrusion method hardness test, that is, Brinell hardness HB, Rockwell hardness HRA, HRB, HRC, Vickers hardness HV, rubber and plastic Shore hardness HA, HD and other hardness. The hardness testing of plastics is most commonly measured by the Shore (Durometer) test or Rockwell hardness test. The resulting depth is dependent on: Hardness of the material Its viscoelasticity Shape of the indenter Duration of the test. The higher the number, the greater the resistance. HARDNESS PLASTIC AND RUBBER - Easydur (Range between 220-900 cps) TDS. Low viscosity helps them flow into more intricate molds to create amazing parts. INTRODUCTION Hardness, measured on a Shore A or D scale, is a material's resistance to surface penetration. Semi-rigid plastics can also be measured on the high end of the Shore . Both methods measure the resistance of the plastic toward indentation.