Viton® fluoroelastomers

HMX HMX HMX HMX HMX HMX HMX HMX HMX HMX HMX HMX HNS NTO NTO/HMX NTO/HMX NTO/HMX PETN PETN PETN PETN PETN PETN PETN PETN PETN PETN RDX RDX RDX RDX RDX RDX RDX RDX RDX RDX RDX RDX RDX TATB/HMX Cariflex (thermoplastic elastomer) Hydroxy-terminated polybutadiene (polyurethane) Hydroxy-terminated polyester Kraton (block copolymer of styrene and ethylene-butylene) Nylon (polyamide) Polyester resin-styrene Polyethylene Polyurethane Poly(vinyl) alcohol Poly(vinyl) butyral resin Teflon (polytetrafluoroethylene) Viton (fluoroelastomer) Teflon (polytetrafluoroethylene) Cariflex (block copolymer of butadiene-styrene) Cariflex (block copolymer of butadiene-styrene) Estane (polyester polyurethane copolymer) Hytemp (thermoplastic elastomer) Butyl rubber with acetyl tributylcitrate Epoxy resin-diethylenetriamine Kraton (block copolymer of styrene and ethylene-butylene) Latex with bis-(2-ethylhexyl adipate) Nylon (polyamide) Polyester and styrene copolymer Poly(ethyl acrylate) with dibutyl phthalate Silicone rubber Viton (fluoroelastomer) Teflon (polytetrafluoroethylene) Epoxy ether Exon (polychlorotrifluoroethylene/vinylidine chloride) Hydroxy-terminated polybutadiene (polyurethane) Kel-F (polychlorotrifluoroethylene) Nylon (polyamide) Nylon and aluminium Nitro-fluoroalkyl epoxides Polyacrylate and paraffin Polyamide resin Polyisobutylene/Teflon (polytetrafluoroethylene) Polyester Polystyrene Teflon (polytetrafluoroethylene) Kraton (block copolymer of styrene and ethylene-butylene)... 

Source Processing Guide Viton Fluoroelastomer, Technical Information Bulletin VTE-H90171-00-A0703, DuPont Dow Elastomers, 2003 (With permission). 

Viton fluoroelastomer Viton is a registered trademark of DuPont... 

Viton Fluoroelastomer, DuPont Dow Vitron Fiberglass staple fiber, Johns Manville... 

DuPont Dow Elastomers fuel-resistant Viton fluoroelastomers are an important source for the applications described previously. The company s Kahez perfluoroelas-tomers with reduced contamination are widely used with semiconductors and other contamination-sensitive applications. Contamination caused by high alcohol content in gasoline can cause fuel pump malfunction. The choice of polymer can determine whether an engine functions properly. 

Butyl rubber Natural rubber Neoprene rubber Nitrile rubber Polyvinyl alcohol - PVAL Polyvinyl chloride - PVC Viton (Fluoroelastomer)... 

Stevens, R.S., Moore, Ai., Paper 32, A New, Unique Viton Fluoroelastomer With Expanded Fluids Resistance, ACS Rubber Div., October 1997. 

Processing Guide for Viton Fluoroelastomers, DuPont Performance Elastomers Technical Bulletin (07/03 VTE H90171-00-A0703). 

J.G. Bauerle, The A Types of Viton Fluoroelastomer A-35, A, A-HV, DuPont technical literature. Publication E-23074. 

Thiols iateract readily with many mbber-containing materials. For this reason, care should be taken ia the selection of gasket and hose materials. Teflon, Kel-F, Viton, or other suitable fluoroelastomers function as gasket materials. Viton is suitable for hoses. Carbon steel is useful for many thiols, although some thiols become very discolored when carbon steel is utilized. In these cases, the use of stainless steel is very desirable. Isolation from air and water also minimizes color formation. 2-Mercaptoethanol and 1,2-ethanedithiol should be stored ia stainless steel (61). 

Maiti and Bhowmick reported exciting results that a polar matrix like fluoroelastomer (Viton B-50) was able to exfoliate unmodified clay (Cloisite NA ) as well as the modified one (Cloisite 20A) [93]. They studied morphology, mechanical, dynamic mechanical and swelling properties of fluoroelastomer nanocomposites. The unmodified-clay-filled systems showed better properties than the modified ones (Table 2.3). 

In addition, Maiti and Bhowmick [93] also used fluoroelastomers having different microstructure and viscosity (Viton B-50, Viton B-600, Viton A-200, and VTR-8550). Viton is a terpolymer of vinylidene fluoride (VF2), hexafluoropropylene (HFP), and tetrafluoroethylene (TFE). Even with the addition of only 4 phr of clay in Viton B-50, the tensile strength and modulus improved by 30-96% and 80-134%, respectively, depending on the nature of the nanoclays. The better polymer-filler interaction in the case of NA clay and the fluoroelastomers has... 

A fluoroelastomer manufactured by Du Pont called Kalrez, has mechanical properties and resistance to oxidants which are similar to those of Viton. In contrast with Viton, Kalrez has good resistance to polar molecules such as amines, ethers, ketones, and esters. Kalrez is unique among the elastomers in its tolerance to both polar and nonpolar solvents. The cost of O-rings made from Kalrez is very high, but for certain critical applications this cost can be justified because of the outstanding range of solvent tolerance. 

The first commercial fluoroelastomer, Kel-F, was developed by the M. W. Kellog Company in the early to mid-1950s and is a copolymer of vinylidene fluoride (VDF) and chlorotrifluoroethylene (CTFE). Another fluorocarbon elastomer, Viton A, is a copolymer of VDF and hexafluoropropylene (HFP) developed by du Pont was made available commercially in 1955. The products developed thereafter can be divided into two classes VDF-based fluoroelastomers and tetrafluoroethylene (TFE)-based fluoroelastomers (perfluoroelastomers).72 The current products are mostly based on copolymers of VDF and HFP, VDF and MVE, or terpolymers of VDF with HFP and TFE. In the combination of VDF and HFP, the proportion of HFP has to be 19 to 20 mol% or higher to obtain amorphous elastomeric product.73 The ratio of VDF/HFP/TFE has also to be within a certain region to yield elastomers as shown in a triangular diagram (Figure 2.2).74... 

Coatings and sealants for varied industrial applications are made by dissolving compounds of low-viscosity FKM elastomers, such as VITON C-10, VITON A-35, or FLUOREL 2145, in methyl ethyl ketone, ethyl acetate, methyl isobutyl ketone, amyl acetate, or other related ketones.47 Such products have typical useful storage life of 7 days at 24°C (75°F) and cure within 2 weeks.58 The subject of coatings and sealants based on fluoroelastomers is covered in more detail in Modern Fluoropoly-mers (Scheirs, J., Ed.), Chapter 23 (Ross Jr., E. W. and Hoover, G. S.), John Wiley Sons, New York (1997). 

Steward et al. [73] preferred the Co(III)/HN03 system. These authors utilized the cell of Fig. 18 with a separator (which permits concentration of the waste in the anolyte reservoir) and corrosion-resistant electrodes such as Pt. The suggested concentrations are 0.5 M for Co(II) and 4-12 M for HN03. This process appears to be able to destroy the vast majority of organic materials. Double bond, alcohol, and carboxylic acid groups greatly facilitate the oxidation process. However, aliphatic hydrocarbons exhibit slow oxidation. Only the CF bond, such as that contained in PTFE, polyvinylidenefluoride, and fluoroelastomers (Viton), is not oxidized. Thus, these polymers are excellent materials for the construction of mediated... 

Ethylene propylene (Nordel) Epichlorhydrin (Hydrin) Fluoroelastomers (Viton)... 

Fluoroelastomer (Viton, Fluorel 2141, Kel-F) 450 Can be used at high temperatures with many fuels, lubricants, hydraulic fluids, solvents, highly resistant to ozone, weathering. Good mechanical properties. 

DuPont Performance Elastomers, Chemical Resistance Guide, Version 6.0 (August 2006) Overview of Elastomers and Elastomer Materials, ElastomeFs Characteristics, Fluoroelastomer (Viton. FKM) and Nitrile, hydrogenated Nitrile (NBR, HNBR), Available at http /www.dupontelastomers. com/Tech Info/chemical.asp (accessed October 7, 2006). 

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