Friday 22 November 2013

Thermal and chemical resistance of Orings

Oring to its high strength, durability, low maintenance, ease of availability, good conducting properties, metal is used widely in almost every industrial sector. Metal is used in many forms like pipes, sections, wires, rods, sheets, etc. In many of the industries metal pipes or hollow sections are used to convey fluids (gases or liquids) from one place to another.

Just as the function of a sealant is to prevent leakage or to seal any openings there are materials whose purpose is to isolate thermal environments from each other on its two sides. Hot and cold Insulation materials are used to provide a layer of insulation which reduces or minimizes the heat flow. Besides good thermal resistance good hot and cold insulation materials have properties like being inert to a wide range of chemicals (high chemical resistance), physically stable or tough, etc. Depending on the need, a suitable hot and cold insulation material is used to provide thermal barrier.

Hollow seals are used in applications that require the seal to stay in the groove while not overfilling the gland or warping the enclosure lid or door. Hollow ORings consist of an elastomer inner ring and a seamless sheath which surrounds the elastomer ring. Similar to PTFE O-Rings hollow O-Rings are used wherever the chemical resistance of normal elastomer O-Rings are not sufficient. The required elasticity is provided by the elastomer ring, the chemical resistance by the seamless sheath.

Advantages of hollow seals are that they are chemical resistant, a wide range of thermal stability, low permeability and low friction. Hollow seals are used as sealing elements, as energizing elements for hydraulic slipper seals and wipers and thus cover a large number of fields of application. Encapsulated hollow seals consist of an elastomer inner ring and a seamless sheath which surrounds the elastomer ring. Similar to PTFE O-Rings encapsulated and hollow seals are used wherever the chemical resistance of normal elastomer O Rings are not sufficient. The required elasticity is provided by the elastomer ring, the chemical resistance by the seamless sheath.

There are no fields of industry where hollow seals are not used. From an individual seal for repairs or maintenance to a quality assured application in aerospace, automotive or general engineering. Hollow seals are used to seal the joints between two metal parts or to seal any openings. These sealants are used widely in many industrial and commercial areas. Darcoid Nor-Cal Seal is a world class supplier of hollow o-rings and other rubber, sealing elements.

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