But for short working periods it will take even higher temperatures. Soft and flexible, it is commonly used in applications requiring movement, such as metering (peristaltic) pumps and robotics.
For short working periods it will take even higher temperatures. Special compounds having improved chemical resistance are also available with new types always being developed in our own RD centers. Each elastomer has a temperature range that it works best in.
This resource outlines these ranges as well as other useful information.
As the fluorine level increases, however, low- temperature flexibility decreases. This helps designers and engineers to balance the fluid resistance and low- temperature flexibility of the final vulcanization. Standard NBR will operate successfully at -35°C (However, some special NBR compounds can provide effective sealing down to temperatures of -55°C,) In addition to temperature, other application conditions differentiate these two compounds.
Buna on the other hand is only effective up to 250°F. In the VANOS, the Buna-N o-rings deteriorate. For general-type seals, the optimal viton o-ring temperature range is between -15°F and 450°F in static applications, though it can withstand service temperatures up to 527°F for a short time.
Full operation at 450°F will shorten parts’ lifetime more than full operation at -15°F. Under dynamic conditions, the lowest service temperature is between 5°F and 0°F (–15°C and –18°C).
Gas permeability is very low and similar to that of butyl rubber. Special formulation can also improve resistance to water, steam, acids and fuels. Application Difference The application range of PTFE includes chemical machinery, medical equipment, electronic appliances, and other fields, the most common is the coating on the non-stick pan. Fluorocarbon elastomers exhibit excellent resistance to high temperature and low compression set.
Non adatta al contatto con oli minerali, idrocarburi e ozono. HTRC is thermally stable for continuous use in temperatures of 450°F an depending on the specific application, has serviceability in environments up to 550°F. The US manufacturer, UTEX, claims excellent resistance to a wide variety of chemical environments. Coated Fabric Properties.
Although generally more expensive than NBR (Nitrile) O-rings, FKM has found wide acceptance in the aircraft, automotive and chemical industries. VITON - DURO: VIT70. Viton Rubber Strip Material.
Similar designs are also available in PVDF. Non-metallic ball nrvs, in PVC or ABS with union connectors, ⅜” to 4c, have EPDM seals and are suitable for a maximum working pressure of 10barg. The relatively high level of fluorine allows for exceptional resistance to chemical attack, but with limited low temperature capabilities.
There is a range of GFLT products to accommodate various processing conditions. It has a temperature range of -to 4degrees Fahrenheit. All rights reserved.
Temperature Resistance: Buna N has a temperature resistance up to about 1°C. Special Applications: Buna N is used to manufacture il seals, laboratory gloves, fuel pumps, etc. Temperatura di impiego:-20°C fi no a 200°C Colore: marrone Vantaggi: eccellente resistenza agli oli minerali e grassi, compreso la maggior parte degli additivi, ed agli idrocarburi. Oil and chemical resistance are also essentially unaffected by elevated temperatures.
Glass transition temperatures (Tg) of materials are indicative of low temperature performance in typical elastomer applications. Its only real limit to be use is its very high cost.
Avoid heating for prolonged periods above the recommended upper processing limit. Hazardous decomposition products may be produced when the recommended processing temperatures or times are exceeded. If you would like more information about our range of download our catalogue, or contact a member of the team. Poor high temperature properties.
Concentrated acids, ketones, esters, chlorinated and nitro hydrocarbons.
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