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KALREZ@ Perfluoroelastomer Parts Combine the Elastomeric Properties of VITON” Fluoroelastomer with the Chemical Resistance of TEFLON@ Fluorocarbon Resins

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KALREZ@ Perfluoroelastomer Parts Combine the Elastomeric Properties of VITON” Fluoroelastomer with the Chemical Resistance of TEFLON@ Fluorocarbon Resins CHEMICAL RESISTANCE AND FLUID COMPATIBILITY KALREZ@ perfluoroelastomer parts combine the elastomeric properties of VITON” fluoroelastomer with the chemical resistance of TEFLON@ fluorocarbon resins. Due to its unique properties, KALREZ perfluoroelastomer parts should be considered for service in all applications and environments where dependable long-term service is desired, as well as in hot and/or aggressive environments which are beyond the serviceability of common elastomers. This guide is intended to provide assistance in determining the suitability of six commercially available elastomers-nitrile (NBR). ethylene propylene (EPDM), silicone (SI), fluorosilicone (FSI). vinylidene fluoride based fluoroelastomer (FKM) and KALREZ perfluoroelastomer-for service in over 1,600 chemicals and fluids. The criteria used for these ratings included volume swell resistance based on laboratory immersion testing, labora- tory aging tests. actual field experience and informed judgments based on experience in similar chemical groups. The ratings for the five common elastomers are based on published literature and are offered for general com- parative purposes only-we cannot guarantee their accuracy nor assume responsibility for their use. The rat- ings for these five elastomers may be overly optimistic for elevated temperature and/or high concentration applica- tions since many are based on ambient temperature test- ing. Suitability of these elastomers for service at elevated temperatures rapidly diminishes since higher tempera- tures Increase the effects of chemicals on both the base polymer as well as the crosslink systems. Serviceability is further limited by the upper service temperature limit of each polymer, nominally 107°C/2Z50F, 149°C/3000F, 204°C/4000F, 190°C/3750F. and 204Y/400°F for NBR. EPDM. SI. FSI and FKM respectively-note that these limits are based on air oxidative stability; limits for specific chem- icals are often much lower. Additronally. these elastomers are commercrally available in different grades of polymer and can vary in compound Ingredients-different grades and compounds within a polymer class can have signifi- cantly different performance characteristics. As an example, consider a specific case involving an FKM. whose upper service temperature limit is nominally 204°C/4000F. Many sources will show an ‘A” rating for FKM surtabrlity In toluene service, a common chemical. However, immersion testing of commonly available FKM o-rings at a slightly elevated temperature of 50°C/1220F for 168 hours shows a volume swell exceeding 24% and significant loss of physical properties-surely warranting a “C” rating. Similar tests with KALREZ perfluoroelastomer parts, however, show that the “A” rating is maintarned beyond 100°C/2120F. CHEMICAL RESISTANCE TABLES Since KALREZ has outstanding chemical resis- RATING SYSTEM tance, it withstands nearly all classes of chemicals- because of the combination of the highthermalsta- A Elastomer shows little or no effect (generally bility and excellent chemical resistance, the KALREZ W less than 10% swell) after exposure to the perfluoroelastomer parts rating may be conser- chemical; slight swelling or loss of properties vative,asactualfield experienceandthe example has may occur under severe conditions but this demonstrated. should not affect performance. In comparing the chemical and fluid resistance of B Elastomer may be affected by the chemical KALREZ perfluoroelastomers to that of TEFLON fluoro- after exposure, as evidenced by slight visible carbon resin, certain differences should be kept in mind: swelling and/or loss of physical properties; in B-rated cases, KALREZ parts will often 1) KALREZ is an amorphous low modulus rubber whereas perform satisfactorily long after other elas- TEFLON is a crystalline high modulus plastic. In fluid tomers have failed. environments where high permeation occurs, KALREZ C Elastomer is affected by the chemical after will probably swell to a greater extent than TEFLON exposure, as evidenced by moderate to severe even though the polymer is not chemically attacked. swelling and/or loss of physical properties; Environments in which this is most noticeable are fully limited functionality is possible but must be halogenated solvents and FREON@. Serviceability of determined by testing. KALREZ in these environments will be dependent upon U Elastomer is not suitable for service in the the specifics of the application. chemical. 2) As with all elastomers, it is necessary to compound Where no rating is shown, insufficient information KALREZ perfluoroelastomers with fillers and curatives is available to make a judgment. to gain desired mechanical properties for functionality. In a limited number of environments, even though the An asterisk (*) next to a KALREZ perfluoro- polymer is stable, the fillers and curative systems may elastomer rating indicates that differences may exist interact with the chemicals. However, since the level of between KALREZ compounds in certain applications fillers in KALREZ perfluoroelastomers is much lower which could affect relative performance-consult your than in most other elastomers, such filler interactions Authorized Distributor or Du Pont for compound are generally negligible with KALREZ parts, Where such selection. For such environments, other elastomers interactions can occur, such as in highly oxidative generally have very limited serviceability. environments, service performance is dependent on the w conditions of the application and may be affected by choice of compound. CAUTION Since each and every application is unique, it is recom- KALREZ perfluoroelastomer parts, like all fluorinated prod- mended that users of KALREZ perfluoroelastomer parts ucts, should not be exposed to molten or gaseous alkali always conduct their own evaluations to determine the metals, such as sodium and potassium, because a highly suitability of KALREZ for their application. Because of labo- exothermic reaction may occur. ratory constraints and differences in field applications. the At elevated temperatures above 100°C/2120F, service results shown in this guide may be based on conditions life may be significantly reduced in fluids containing high which may not necessarily reflect actual operating environ- concentrations of some diamines. nitric acid and basic phe- ments for a specific application. Additionally, many elas- nols. KALREZ parts should always be tested for suitability. tomeric materials may show excellent chemical resistance to pure reagents in relatively short-term laboratory tests. However, they may fail in actual service because of chemical attack by additives and/or impurities. KALREZ per- fluoroelastomer parts. with their near universal chemical resistance, provide an extra degree of safety against these unknown corrosive influences. A Case History booklet is available from your Authorized KALREZ Distributor detailing proven performance of KALREZ parts in over 100 specific chemical applications. Information on test performance in a limited number of specific chemicals is also available through your Authorized ‘KALREZ Du Pant registered trademark for its perfluoroelastomer parts Distributor. ‘VITON. TEFLON, FREON Du Pant regstered trademarks Generally, KALREZ parts ratings are applicable up to 100°C/2120F-however, in many chemicals, KALREZ parts will be functional at higher service temperatures. Testing is always recommended for each proposed use of KALREZ since actual application conditions may vary. Please note rating comments on page 3 for compound selection in fluids with asterisk ( * ) notation. Chemical <ALREi NBR EPDM i FKM Chemical (ALRE? NBR EPDM ii FKM - - -zi - -E - Abietic Acrd A Aluminum Oxalate A Acetaldehyde A* U A B U U Aluminum Phosphate A A A Acetamrde A A A e A B Alummum Potassium Acetanilide A Sulfate A Acetrc Acrd. Glacial A C A B U C Aluminum Salts A Aluminum Sodium Acetic Acrd. 30% B A A B B Sulfate A Acetic Anhydride C B C U U Acetoacetic Acid Aluminum Sulfate A A A A Acetone U A C U U Alums A Acetone Cyanohydrin Amines A* Aminoanthraquinone A Acetonitrile A Amrnoazobenzene A Acetophenetidine Acetophenone A U U U Aminobenzoic Acid A Acetotoluidide Aminobenzene Acetylacetone Sulfonic Acid A Aminoethyl- Acetyl Bromrde A ethanolamine A* Acetyl Chloride A* U C A A Amino Phenol A* Acetylene A A B A Aminopyridine A Acetylene Tetrabromide A Ammosalicylic Acid A Acetylene Ammoma. Anhydrous A* C U Tetrachloride A Ammonia Gas (cold) A A U Ammonia Gas (hot) A* A U Acetyisalicylrc Acid Ammonium Acetate A Acids, Organic Acids. Non-Organtc Ammonium Arsenate Aconitic Acid A Acndine Ammonium Benzoate A Ammonium Bicarbonate A Acrolern A Ammonium Bifluoride Acrylic Acid A A* Ammonium Brsulfrte A Acrylonitrile A* U U U C Adipic Acid A A - A Aliphatic Dicarboxylrc Ammonrum Bromide A Acid A Ammomum Carbamate A Alkanes (Paraffin Ammonium Carbonate A Hydrocarbons) A Ammonium Chloride Alkanesulphonic Acid A (Sal Ammoniac) A Alkenes (Olefin Ammonrum Citrate A Hydrocarbons) A Aikyl Acetone A Ammonium Alkyl Alcohol A Dichromate A Ammonium Alkyl Amine A Diphosphate A Alkyl Aryl Ammonium Fluoride A* Suiphonates A Ammonium Alkyl Aryisulphonics A Fluosilicate A Alkyl Benzene A Ammonium Formate A Alkyl Chloride A Ammonium Hydrogen Alkylnaphthalene Fluorrde A* Sulfonic Acid A Ammonium Hydroxide Alkyl Sulfide A (cont.) A* A B B Allylidene Diacetate A* Ammonium Iodide A Alpha Picoline A Ammonium Lactate A Aluminum Acetate A B U Ammonium Metaphosphate A Aluminum Bromide A Aluminum Chlorate A Ammonium Aluminum Chloride A A A Molybdate A
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