Natural Rubber Chemical Resistance
Rubber Stamps Customization Overview
With so much of today's specialty chemicals and pharmaceutical products depends on production equipment as it is surprising that engineers often overlook the opportunity to specify custom elastomer seals. However, the evolution sealing technology made it easier than ever to produce custom stamps.
With a wide range of elastomers, it should be possible find a good match for any process condition. However, for some high value, difficult to chemical processes, is not good enough. A new trend in processing chemicals and pharmaceuticals is the requirement of small changes in existing grades seal have large effects on the mechanical properties a seal. There are many types of elastomers and an infinite number of performance improvements can be made by changes in the composition, which seals to be "tuned" to meet the needs of specific applications.
Elastomer Chemistry
Selection of a rubber stamp begins with the fulfillment of the requirements chemical resistance and operating temperature of a process. It is necessary to note that synthetic elastomeric materials generally consist of a polymer organic and inorganic reinforcing filler systems. Although the polymer backbone may be similar, therefore the determination of many properties physical, see Figure 1, can be significant differences in cross link and filling systems, the creation of many of the differences in physical properties and Therefore, the sealing efficiency.
Customizing the rubber seal is possible that the physical properties of an elastomer. By making changes in the filling system is possible to optimize the physical properties of a certain degree of material compared with others in the same grade. The reinforcing effect of a filling is complex and depends size of the structure of the particles and the chemical composition of the particles themselves.
Carbon black, for example, has a rough surface, making it particularly effective reinforcement. However, some synthetic silicas are perfectly spherical, offers very little in terms of reinforcement. To achieve specific physical properties of a material of the right combination of strengthening and reinforcing filler should be selected.
Fillers can be classified as reinforcement or reinforcing, depending on whether the arrest of crack propagation at higher stresses as they rise, or vice versa. Within a polymer of the load may have two effects can act as stress raisers, reducing the energy of rupture, or can stop crack propagation to increase the energy needed to rupture.
Engineers can use the "filler effect" to select the quadrant that best suits the "Physical Properties box" to their process equipment. The modulus of a material is related to its hardness. As the module increases so does the hardness, high hardness O-rings are able to withstand high pressure extrusion. The tensile strength, elongation and hysteresis loss of a material are useful indicators of elasticity of an elastomer. Despite the seals by their nature are typically used in compression, elastic properties may result in the development of tensile stresses in the body of the seal when subjected to compression or shear.
Typical applications include sealing against the dynamic a reciprocating or rotary shaft or drilled. The compression of material, combined with the forces of friction cutting can lead to tensile stresses exceeding the strength tensile strength of the material that causes a power failure. In this case, using a large area, small filler particle size would be a better option than standard dummy reinforcement. However, the throughput can suffer burns may result. It is often the case that a compromise between improving the property and processing capacity has to be done.
About the Author
Established for over 30 years, PPE manufacture and supply high performance moulded rubber o rings to various industries around the world.
NIST Colloquium Series: Next Generation Neural Implants
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