Hard Rubber Material Properties

Durometer like many other hardness tests measures the depth of an indentation in the material created by a given force on a standardized presser foot.

Hard rubber material properties.

Natural rubber features low compression set high tensile strength resilience abrasion and tear resistance good friction characteristics excellent bonding capabilities to metal substrate and good vibration dampening characteristics. Thus if you need a rubber or o ring durometer that feels like a running shoe. Raw rubber when heated to 130 c becomes soft and plastic. Pure gum is an example of a non synthetic rubber that is tear resistant and exudes great elasticity before failure.

The article explains these properties of rubber in detail. A durometer scale is a type of measurement for rubber material hardness. Shore a is used for a soft to medium hard rubber. The chemical structure of the elastomers provides them with an inherent hardness that can be altered.

Ebonite is a brand name for a material generically known as hard rubber and is obtained by vulcanizing natural rubber for prolonged periods. Astm d2240 durometers allows for a measurement. This depth is dependent on the hardness of the material its viscoelastic properties the shape of the presser foot and the duration of the test. Its name comes from its intended use as an artificial substitute for ebony wood.

Rubber compounding is a very broad and technical field since basic rubbers or elastomers are mixed with various chemicals and ingredients and even with each other to obtain desired physical properties. The rubber durometer chart below gives you an idea of the rubber hardness that you want for your application. The modified hardness is then measured in terms of of durometer duro on a shore scale. The 3 most common durometer gauges used to measure rubber are type a type m and type d.

Physical properties of crude natural rubber. Natural rubber is a product coagulated from the latex of the rubber tree hevea brasiliensis. The chart below is intended to help in the material selection stage of designing rubber parts products. The plasticity can be varied within certain ranges by chemicals.

Generally most rubber materials fall under the rubber durometer scale of shore a. And dynamic properties of rubber which are of importance in shock and vibration. That measures the penetration of a stress loaded metal sphere into the rubber hard. Many mats sheets or rolls can be inserted with cloth or fabric.

Type m also for soft materials was developed to test small specimens typically o rings that do not meet the physical size requirements specified. Rubber is a unique material that is both elastic and viscous rubber parts can there. The physical properties of crude natural rubber are indicated below. At low temperature rubber becomes stiff and when it frozen it attains fibrous structure.

Hard rubber materials of a synthetic origin such as styrene butadiene rubber and skirtboard can provide a user with these crucial advantages.