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Basic elastomers for O-Rings
The following paragraph briefly reviews various elastomers currently available for use in O-Rings and other seals.
FFKM (Perfluoro rubber)
Perfluoroelastomer is produced by the copolymerization of tetrafluoroethylene (TFE) and a perfluorinated ether, e.g. perfluoromethylvinylether (PMVE). The cured polymer does not contain hydrogen atoms in the molecule. The absence of hydrogen increases the heat and chemical resistance as compared to FKM. Perfluoroelastomers show broad chemical resistance similar to PTFE (DuPont–Teflon®) as well as good heat resistance. They show low swelling with almost all media. Depending on the material the operating temperatures range between -25°C and +300°C. This high-end material has been on the market since 1968 and is the most expensive elastomer available, comparable to gold.
FFKM parts provide reliable, long-term service with a wide range of aggressive industrial and electronic grade chemicals. It is used in highly aggressive chemical processing, semiconductor wafer processing, pharmaceutical applications, oil and gas recovery, aerospace and petroleum applications.
FFKM . X70N00T
TRADE MANE TEMPERATURE RANGE CHEMICALL RESISTANCE APPLICATIONS
KALREZ®, CHEMRAZ®, SIMRIZ ®, PARAFLUOR® -15 / +316°C HYDRAULIC FLUIDS OILS MOST HYDROCARBONS MAJORITY OF CHEMICALS SUPERIOR MATERIAL, CHEMICAL RESISTANCE EQUAL TO PTFE. VERY EXPENSIVE
NOT COMPATIBLE WITH:
PERFLUORINATED HYDROCABONS, MOLTEN ALKALI METALS
For demanding sealing applications when customers require the very best, Kalrez® parts manufactured only by DuPont Performance Elastomers, are the elastomer seals of choice. Supplied in standard O-rings or custom shapes, Kalrez® resists over 1,800 different chemicals while offering the high temperature stability of PTFE (327°C). Types Available:
O-rings
Slabs and Sheets Custom Parts and Shapes (Rod, tubing etc)
Kalrez® Compound Available (Click on each of them for more informations):
1050LF, 10018 & 1058:
Physical Properties and Compound Comparisons Kalrez®
perfluoroelastomer parts are available in a number of different compounds that are
formulated to optimize properties and give the best possible performance in various applications.
Modification of the finished properties is achieved by use of fillers and other additives.
Table 1 summarizes the basic physical properties of the most commonly used compounds.
Descriptions of the key attributes of each compound and their general areas of application follow.
2035 & 2037:
Kalrez® 2037 for Semiconductor Applications Compound Description
Kalrez® 2037 is a white compound that is suitable for use in some plasma and gas deposition
applications. It exhibits very low weight loss in oxygen and fluorine-based plasmas and has good mechanical strength properties. A maximum service temperature of 220°C is suggested. Ultrapure post-cleaning and packaging is optional. Performance peatures/Benefits
• Very low weight loss in oxygen and fluorine-based plasmas
• Good mechanical strength properties
• Good compression set properties
• Good resistance to dry process chemistr
4079:
Kalrez® 4079 for Semiconductor Applications Compound Description
Kalrez® 4079 is a black, low compression set compound for use in many dry and wet semiconductor process environments. It has excellent chemical resistance, good mechanical properties and outstanding thermal stability. Kalrez® 4079 exhibits low weight loss in reactive plasmas and has good response to temperature cycling effects. It is not recommended for use in amines. A maximum continuous service temperature of 316°C is suggested. Short excursions to higher temperatures are also possible. ltrapure post-cleaning and packaging is optional.
Performance Features/Benefits:
• Excellent thermal stability
• Excellent chemical resistance
• Excellent compression set resistance
• Good response to temperature cycling effects
6375 :
Kalrez® Spectrum™ 6375 Product Overview For over 25 years, Kalrez® parts have been the sealing material of choice for long-term reliable sealing in the harshest chemical environments. Today, elastomeric seals are expected to perform in a variety of even more aggressive chemicals and at higher temperatures. To meet the needs of chemical processors, DuPont Performance Elastomers has developed a product that expands on the capabilities of existing Kalrez® parts with broader chemical resistance while maintaining the high temperature stability you’ve come to expect from Kalrez®.
6230 & 6221:
Perfluoroelastomer Parts for Pharmaceutical and Food Handling Applications Kalrez® parts made from compounds 6221 and 6230 provide superior chemical resistance and low contamination from extractables in pharmaceutical and food handling applications where FDA compliance is required. Compounds 6221 and 6230 are especially suited for Water For Injection (WFI) systems, Steam-in-Place (SIP) cleaning and other critical systems.
7075:
Kalrez® Spectrum™ 7075 Product Overview
Kalrez® perfluoroelastomer parts have been the material of choice for mechanical seals, valves, flanges and other demanding chemical and hydrocarbon processing applications for over 30 years.To meet the increasing needs in more demanding applications, DuPont Performance Elastomers (DPE) continues to develop new products with even better sealing performance. Kalrez® Spectrum™ 7075 expands on the capabilities of Kalrez® 4079 by offering much lower compression set, increased seal force retention, broader chemical resistance and higher temperature stability.Kalrez® Spectrum™ 7075 Kalrez® Spectrum™ 7075 joins the family of Kalrez® Spectrum™ products designed for the chemical processing industry.
Compound 7075 broadens the family of Spectrum™ sealing options with enhanced physical performance properties including very low compression set (Figure 1) and improved seal force retention (Figure 2). Kalrez® 7075 o-rings have a glossy finish for dynamic applications that may benefit from less drag. |