Injection Mouldings - Soft & Flexible

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Injection Mouldings - Soft & Flexible
Posting date : Jan 12, 2009
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and flexible parts which are made from thermo-plastic-elastomers (TPEs) or thermo-plastic-rubbers (TPRs). Most are used for water-proofing or weather-proofing in some way. We have a Durometer to measure the hardness/softness of these soft parts and an explanation of the Shore A system is described below. ? All soft-touch TPE products are characterized by their hardness, defined as a material's resistance to indentation or penetration. The hardness of a material is measured by a Shore durometer. This instrument uses an indentor to penetrate the specimen-the degree of penetration determines the hardness of the material. The greater the penetration, the lower the hardness of the material. ? There are three different Shore durometers (D, A, 00) commonly used to measure the hardness of polymeric materials. The Shore D durometer is used for fairly rigid plastics, Shore A is for flexible plastics/TPEs, and the Shore 00 is for ultrasoft, gel-like materials. ? Each Shore hardness scale ranges from 0 to 100; 0 means full penetration and 100 is no penetration. Since each scale is accurate only from 20 to 90, readings outside this range should move to the next lower or higher hardness scale. As a result, the three hardness scales overlap each other slightly (see chart). ? In cases where the Shore A hardness is greater than 90, the Shore D durometer is more appropriate. For materials with a Shore A hardness less than 20, the Shore 00 durometer can be used. Materials that fall in this hardness range have gel-like characteristics, such as gummy bear candy. ? Hardness is often confused with flexural modulus or coefficient of friction (COF). The flexural modulus is a measurement of a material's resistance to bending, while COF is a measurement of the degree of resistance an object experiences as it slides across the surface of the TPE ("grippy" vs. smooth). Two TPE materials can have the same hardness, yet have two different surface feels (rubbery vs. silky smooth) or different flexural modulus values.

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