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Once a rubber type has been selected, the hardness range must be determined. Hardness is measured in degrees on the Shore “A” or IRHD scale (the values are similar although Shore “A” readings are usually one to three degrees higher than IRHD readings). Hardnesses are normally based on a nominal figure e.g. 50 ±5° or as a hardness range e.g. 50-60°.
Materials below 30° are extremely soft and comparable with foams. These are available but must be regarded as a special requirement.
A set of hardness test pieces may be obtained from Mech on request but the hardness ranges may generally be described as follows:
Any specific requirements relating to tensile stress/strain properties should be defined by minimum tensile strength, minimum elongation at break and, where relevant, by modulus (i.e. minimum tensile stress at a given strain). Such limits should be derived by calculation based on the actual requirements of the application, by comparison with known values for similar applications or materials, or by testing a material which has been proved satisfactory by trial or experiment.
Many Uses of Rubber are compression applications and it may be necessary to define the maximum compression set taken on by a rubber when under load for a period of time. This is usually expressed as the percentage of the compression which is not recovered within a short time after release (30 minutes in BS 903 pt.A6).
Compression set limits should only be specified when necessary and must give the time and temperature as well as the amount of compression to be applied. Typical compression set values are shown below for 24 hours compression at 70°C. The test pieces were compressed to 75% of their original height.
Typical Compression Set values camn be found here: Typical Compression Set Values
"ONGC - Oil and Natural Gas Corporation Limited" - Our complex drilling application where Shaft was eccentric and application was robust & muddy. Replacement was never easy. Mech Spares designed Oil seals resolved difficulty. This gave a complete joy to my maintenance team.
"Mr Mohammed Al Duaigy" of (Kuwait National Petroleum Company) : We tried several diaphragms from renown worldwide Rubber manufacturing companies. We found Mech Spares technical know how and product to be of great durability and lasted 3 times more then anticipated. They have accurate understanding of there products.
"McCafferty BM Design Ltd, KENT United Kingdom" - Most of the O rings manufacturing company suggested to use larger diameter and expensive elastomers. We learnt with Mech Spares that elastomer being weaker compare to metal and alloys and needs appropriate back up for high pressure or high vacuum applications. Further not necessary the most expensive elastomer is the best for all applications. We trust Mr Nilesh chodhari completely for all our O rings designing applications.
"Dr. A. Singh" of BARC: The electric Insulation mat manufactured by MECH SPARES as per IS 15624 tested at ERTL and found to withstand 40 Kv and still didn't tear. We have been using since 5 years and still didn't generate any fatigue. They arranged bulk delivery in short period.
"Tata Steel" - One of our old machines started making loud noise and disturbed the entire village. We were compelled to stop the machines which lead to huge production loss. With the help of Mech Spares designed bellows in two part we could retain the lubrication and eliminate the noise.
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