Both sheet and rod are available in many thicknesses and diameters. Rod stock comes ground to diameter to accommodate through spindle . Some of the testers and scales that can be use for hardness testing are Rockwell B&C, Shore A&D , Brinell . Most commonly referred to as UHMW. Both methods measure the resistance of the plastic toward indentation. Named after Albert F. Shore who created the device in the 1920s, a durometer is a precision instrument that calculates a material's hardness, often called Shore hardness . The hardness of a polymer sample is determined by the penetration of the Durometer indenter foot into the sample. > Acetal (POM / Polyoxymethylene) Acetal (Copolymer) is an engineering thermoplastic polymer that provides good strength and stiffness. 4.4 out of 5 stars 145. Cast urethane plastic: 70 . The hardness testing of plastics is most commonly measured by the Shore (Durometer) test or Rockwell hardness test. Shore A is used with soft rubbers and elastomers. Hardness of Plastics - When to Use RockWell & Shore Scales Rubber with a Shore hardness around 75A or more is most common for flat objects, such as paving stones. Portable hardness tester for on-site Shore hardness testing (on construction sites, in production departments, laboratories, etc.) PDF Plastic Shoreness Explained Mixed Visc. The harder material wears or scratches the softer material. Named after its inventor, Albert Ferdinand Shore, Shore hardness offers different scales for measuring the solidity of different materials. Hardness of Polymers Hardness is defined as a material's resistance to permanent indentation. V.C. What is Hardness in Plastics? An In-Depth Guide - PlasticRanger PDF Typical Engineering Properties of Polypropylene This video demonstrates how to use this device to measure hard plastics like . Shore Hardness Guide | PolyGlobal | Polyurethane UK Plastic ... The maximum recommended operating temperature for polypropylene is 180°F (82.2°C).