Shore Hardness Scale D

A chart showing general hardness comparisons is below. Shore hardness and how it relates to other properties. Two different indenter shapes and two different spring loads are used for two shore scales a and d.
shore d hardness scale

Top Shore Hardness Scale D, The hardness value is determined by the penetration of the durometer indenter foot into the sample.

Shore hardness scale d. Shore a 0 denotes extremely soft gel like materials such as silicones while semi rigid plastics will be measured at the highest end of the scale around 90 95a. The measured hardness is determined by the penetration depth of the indenter under the load. Hardness may be defined as a materials resistance to permanent indentation. Tpes can range from 10 shore 00 up to 72 shore d spanning all three hardness scales however the most commonly used is the shore a scale.

Higher numbers on the scale indicate a greater resistance to indentation and thus harder materials. The shore a scale is used for measuring the hardness of softer more flexible materials. The shore durometer is a device for measuring the hardness of a material typically of polymers elastomers and rubbers. Shore hardness value may vary in the range from 0 to 100.

Some of hapcos materials are available in both shore a and shore d. The loading forces of shore a. Shore a hardness scale cross references extra soft soft medium hard shore 00 shore a shore d shore 0 shore b shore c 0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80. While not needed for plaster casting shore hardness proves helpful when you have to choose your materials such as which silicone rubber should be used for making a mold or cast.

Shore d hardness scale is reserved for measuring the hardness of hard rubbers semi rigid plastics and hard plastics. 10 lb 4536 g. Test methods used to measure shore d hardness are astm d2240 and iso 868. Shore who developed a measurement device called a durometer in the 1920s.

Shore d hardness is a standardized test consisting in measuring the depth of penetration of a specific indenter. The shore a hardness scale measures the hardness of flexible mold rubbers that range in hardness from very soft and flexible to medium and somewhat flexible to hard with almost no flexibility at all. Shore hardness measures are dimensionless. 1812 lb 822 g shore d.

Shore hardness is often used as an indication of flexibility or stiffness which is called flexural modulus. The shore 00 hardness scale measures rubbers and gels that are very soft. The durometer scale was defined by albert f. For example a material with a shore hardness of 95a is also a shore 45d.

Lower numbers indicate less resistance and softer materials.