Hardness Shore D Unit

Shore durometer hardness testing of plastics is described and conversion charts correlating various scales are presented. Approximate hardness value to be used as a guide type extra soft soft chewing gum medium soft pencil eraser medium hard windshield wiper blade hard skate wheel extra hard bowling ball shore a rubber soft plastic polyurethane 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 shore b rigid rubber 6 12 17 22 27 32 37 42. Calibration of the durometer is one per week with elastomer blocks of different hardness.
hardness shore d unit

Top Hardness Shore D Unit, Two different indenter shapes see the picture below and two different spring loads are used for two shore scales a and d.

Hardness shore d unit. There are different shore hardness scales for measuring the hardness of different materials soft rubbers rigid plastics and supersoft gels for example. The instrument as well as the unit of measurement is called as a durometer. Defelsko also manufactures the positector bhi barcol hardness impressor which is ideal for measuring the hardness of soft metals aluminum aluminum alloys copper brass etc harder plastics and fiber reinforced plastics. The durometer scale was defined by albert ferdinand shore.

Rigid pvc should be measured by the shore d durometer. Force is 1 kg 01 kg for shore a and 5 kg 05 kg for shore d. 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. The measured hardness is determined by the penetration depth of the indenter under the load.

Shore hardness is a measure of the resistance a material has to indentation. The shore duromter a and d scales of hardness are commonly used for rubber and soft polymers such as polyolefins polyurethanes vinyl and fluoropolymers. Shore hardness value may vary in the range from 0 to 100. 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.

Hardness may be defined as a materials resistance to indentation. Shore hardness and how it relates to other properties. Shore hardness is often used as an indication of flexibility or stiffness which is called flexural modulus. Durometer is used to measure the hardness of polymers elastomers and rubbers.

10 lb 4536 g. Five measurements need to be taken. The positector shd shore hardness durometer measures the shore indentation hardness of non metallic materials such as polymers elastomers and rubbers. The final value of the hardness depends on the depth of the indenter after it has been applied for 15 seconds on the material.

Semi rigid plastics can also be measured on the high end of the shore a scale. 1812 lb 822 g shore d. The shore d hardness scale measures the hardness of hard rubbers. These scales were invented so that people can discuss these materials and have a common point of reference.

The loading forces of shore a. The shore a hardness scale has been used for decades to characterize the relative hardness of flexible pvc.