Daikin’s DAI-EL fluoroelastomer and perfluoroelastomer products provide excellent high temperature and aggressive fluids resistance in sealing and fluid transport applications for automotive, oil and gas, aerospace, chemical process, small engine, and other harsh sealing environments. Daikin’s global technical and manufacturing resources support new developments and application of DAI-EL, each designed to meet specific OEM (end user) and fabricator (processor) requirements. In the Americas, as well as in Asia and Europe, Daikin partners with you to provide the best fluoroelastomer product solutions available in the world today.
DAI-EL: Selection Guide
Selecting a fluoroelastomer grade is often a difficult exercise in balancing performance requirements, processing considerations, and cost. To help you overcome this challenge, DAI-EL has created a selection guide with pertinent information and detailed recommendations. Whether you have a specific processing method and performance property in mind or are interested in exploring where different properties might take you, the DAI-EL selection guide is a powerful tool at your disposal. For additional information and product recommendations, please contact the DAI-EL technical service team.
DAI-EL: Fluid Resistance Guide
Fluoroelastomers and perfluoroelastomers offer superior acid, base, chemical, and fuel resistance compared to other types of rubber. However, significant performance differences exist within these product families. To assist you in determining which grades are most suitable for your operating environment, Daikin has created a chemical resistance guide. This guide details expected performance including volume swell data in harsh operating conditions. While comprehensive, this guide is not exhaustive so for additional information please contact the DAI-EL technical service team.
Effect of Fluorine Content
The fluorine content of a DAI-EL grade affects many things, especially low temperature properties and fluid resistance. In general, the lower the service temperature and volume swell of a compound, the better. However, as the chart below depicts, when selecting a fluoroelastomer there is generally a tradeoff between the two properties. For low temperature operating conditions, consider selecting a DAI-EL low temperature or copolymer grade. For sealing against aggressive fluids or other media, consider a 71% fluorine terpolymer or even a perfluoroelastomer.
Bisphenol Curable Copolymers
Daikin bisphenol curable copolymers are 66% fluorine content copolymers of hexafluoropropylene and vinylidene fluoride. These products exhibit the best heat resistance and lowest compression set among the DAI-EL family. They are particularly suited for O-ring and oil seal applications in high-heat environments. Daikin offers injection and compression molding grades, extrusion grades, metal adhesion grades, and compression set resistant grades. Most DAI-EL copolymers are supplied as cure incorporated precompound but specifically labeled base polymers (BP) are available. These require the addition of a bisphenol curing agent and an accelerator.
For product information including descriptions and tech data sheets, please expand any of the tables below.
|G-EXP Series||Mooney Viscosity||Molding Method||Defining Characteristics|
|G-EXP-002||33||Injection||Very high tensile strength|
|G-EXP-004||42||Transfer & Compression||Easier demolding of seals and complex parts|
|G-EXP-005||30||Injection||Very fast cure|
|G-EXP-006||26||Injection||Extended cure time|
|G-EXP-008||20||Injection||Very high ultimate elongation|
|G-EXP-009||23||Injection||Lowest compression set|
|G-EXP-010*||20||Injection||Extended cure time|
|G-EXP-011||30||Injection||Very low crosslink density, high elongation|
|G-EXP-014||40||Transfer & Compression||Low compression set|
|G-EXP-016*||24||Injection||Extended cure time|
|G-EXP-018||50||Calendering & Compression||Demold seals and complex shapes without tearing and better dynamic flex life|
|G-EXP-019*||41||Transfer & Compression||General purpose grade with a moderate cure|
|G-EXP-021*||22||Injection & Transfer||Excellent mold flow|
|G-EXP-033||33||Transfer & Compression||Low compression set|
|G-EXP-040||48||Transfer & Compression||General purpose grade with a fast cure|
|G-EXP-042||60||Transfer & Compression||Very high crosslink density|
|G-EXP-043*||36||Transfer & Compression||High tensile strength|
|G-EXP-044*||46||Transfer & Compression||Very fast cure|
|G-EXP-048||42||Transfer & Compression||Demold seals and complex shapes without tearing and better dynamic flex life|
|G-EXP-053*||27||Injection||Very fast cure|
This chart compares the G-EXP family of DAI-EL precompounds in terms of their Mooney viscosity, cure time and crosslink density. If you do not see a suitable precompound on this chart, please contact us and we will develop one to meet your requirements.
|G-700 Series||Mooney Viscosity||Molding Method||Defining Characteristics|
|G-701||41||Compression||General purpose grade|
|G-702||41||Compression||Lower crosslink density for complex shapes|
|G-704BP||30||Transfer & Injection||Base polymer|
|G-704||30||Transfer & Injection||Metal adhesion|
|G-741A||40||Compression||Very high tensile strength|
|G-755CBP||25||Extrusion & Calendering||Base polymer|
|G-755BP||29||Extrusion & Calendering||Base polymer|
|G-755||25||Extrusion & Calendering||Smooth, uniform extrusions|
|G-7000 Series||Mooney Viscosity||Molding Method||Defining Characteristics|
|G-7251||20||Injection||Best mold flow|
|G-7261||22||Injection||Extended cure time|
|G-7262||23||Injection||Easier demolding of complex shapes|
|G-7300EBP||35||Injection & Compression||Base polymer|
|G-7320BP||38||Injection & Compression||Base polymer|
|G-7329||34||Injection||Suitable for complex parts with good metal adhesion|
|G-7351E||35||Injection||May be used in compliance with FDA 21 CFR 177.2600|
|G-7371||34||Extrusion & Calendering||Low compression set|
|G-7400BP||46||Injection & Compression||Base polymer|
|G-7451||40||Injection & Compression||Low compression set|
|G-7452||42||Injection & Compression||Lower crosslink density for complex shapes|
|G-7801||66||Compression||Very fast cure|
Bisphenol Curable Terpolymers
Daikin bisphenol curable terpolymers are terpolymers of hexafluoropropylene, vinylidene fluoride and tetrafluoroethylene. Their fluorine content ranges between 66% and 71%. Like the bisphenol curable copolymers, they are available as both base polymer and precompound. These polymers are ideal for applications that require resistance to fuel mixtures and solvents, such as fuel hoses and seals used in chemical processing. Compared with copolymers, cure times tend to be a little longer and compression sets a little higher, and with the exception of DAI-EL G-671 and G-EXP-025, low temperature flexibility is not as good due to higher fluorine content. Injection and compression molding grades, extrusion grades and lower temperature grades are available.
|600 Series||Mooney Viscosity||Fluorine Content||Defining Characteristics|
|G-603||31||71%||Suitable for compression and transfer molding|
|G-621||50||71%||Suitable for compression and transfer molding|
|G-663BP||27||66%||Base polymer suitable for injection molding|
|G-671||35||66%||Suitable for compression and transfer molding with good low temperature properties|
Peroxide Curable Copolymers
Daikin peroxide curable copolymers have 66% fluorine content. These products have better acid resistance and overall mechanical properties than bisphenol cured copolymers. However, there is some reduction in heat and compression set resistance for peroxide curable copolymers. Injection and compression molding grades and improved mold flow grades are available. Post curing can be omitted for these polymers.
|800 Series||Mooney Viscosity||Molding Method||Defining Characteristics|
|G-8002||25||Injection||Best mold flow|
Peroxide Curable Terpolymers
Daikin peroxide curable terpolymers have between 69% and 71% fluorine content. They have better acid resistance, solvent resistance, and overall mechanical properties than bisphenol cured copolymers. As with peroxide cured copolymers, some reduction in heat and compression set resistance is normal compared with bisphenol cured grades. Compression and injection molding, low compression set and lower temperature grades are available. Post curing can be omitted for these polymers.
|900 Series||Mooney Viscosity||Fluorine Content||Defining Characteristics|
|G-901||48||71%||Suitable for compression and transfer molding|
|G-902||19||71%||Suitable for injection molding|
|G-912||56||71%||Low compression set|
|G-952||40||69%||Suitable for compression and transfer molding. Good balance of fluid resistance and low temperature flexibility|
|G-962||24||67%||Suitable for injection molding with good low temperature properties|
|G-964||46||67%||Suitable for compression and transfer molding with good low temperature properties|
Low Temperature Peroxide Curable
Daikin’s low temperature peroxide curable polymers have improved low temperature performance, mechanical properties, flex resistance, acid resistance and flex cracking resistance compared with bisphenol cured copolymers. As with other peroxide cured polymers, some reduction in heat and compression set resistance is seen compared with bisphenol cured polymers. Injection and compression molding, fluid resistant grades are available. Post curing can be eliminated for these polymers.
|LT Series||Mooney Viscosity||Fluorine Content||Defining Characteristics|
|LT-252||35||66%||Flexible to -25°C with better fuel resistance compared to other LT grades|
|LT-302||44||64%||Flexible to -30°C and suitable for compression and transfer molding|
|LT-303L||14||65%||Flexible to -30°C and suitable for injection molding or blending with higher viscosity grades|
|LT-304||26||65%||Flexible to -30°C with improved heat and compression set resistance|
Base Resistant Elastomers
For some oil and gas and automotive applications the base resistance of fluoroelastomer (FKM) products is not sufficient. FEPM rubber has excellent base and amine resistance but has poor low temperature flexibility, poor fuel resistance, and slow cure speed compared to FKM. DAIKIN has developed new 62% fluorine content polymers which combine the processing advantages of FKM with amine resistance comparable to FEPM. These grades are peroxide curable and post curing can be eliminated if desired. For more information, please contact the DAI-EL technical service team today.
Operating environments in the aerospace, oil & gas, chemical processing, transportation and semiconductor manufacturing industries are becoming increasingly harsh. At the same time, global competitive pressures require minimizing maintenance downtime and warranty costs. There is simply no room for failure of critical sealing components. That’s why design, process and maintenance engineers specify DAI-EL perfluoroelastomer for the toughest sealing applications. They know that seals made of DAI-EL perfluoroelastomer are more resistant to aggressive chemicals and high temperatures than any other elastomer on the market today. That means longer intervals between seal changes, reduced risk of leakage, a safer operating environment and higher productivity. DAI-EL is proud to introduce three perfluoroelastomer base polymers in addition to many compounds that satisfy OEM specifications. For more information, please contact the DAI-EL technical service team.
|FFKM||Mooney Viscosity||Max Service Temp Continuous/Peak||Defining Characteristics|
|Peroxide cured base polymer with glass transition temperature of -20°C|
|Super clean peroxide cured base polymer with minimal metal ion contamination|
|Super clean imidazole or triazine cured base polymer with minimal metal ion contamination & best chemical resistance|
* Mooney viscosity at 100°C (ML 1+10 @ 100°C)
** Mooney viscosity at 170°C (ML 1+20 @ 170°C)
Daikin offers a pair of specialty fluoroelastomer products for unique applications where FKM or FFKM won’t suffice.
DAI-EL G-101 is a liquid fluoroelastomer and an excellent processing aid and hardness modifier. Adding a few parts per hundred rubber to a bisphenol cured copolymer compound results in smoother extrusions and moderate reduction in hardness, modulus, and tensile strength while improving elongation significantly.
DAI-EL T-530 is the first thermoplastic fluoroelastomer. Although it performs as an elastomer below its melting point, above its melting point it flows like a thermoplastic material.
Cri-Tech Custom Compounding
Founded in 1977, Cri-Tech is the leader in full service formulation development and custom compounding of high performance elastomers, thermoplastics and specialty products. Cri-Tech operates a 55,000 square foot state of the art mixing facility with separate carbon black and ultra-low contamination “clean” mixing lines. Quality leads the way at Cri-Tech with systems that ensure 100% traceability of the raw materials used in each batch and computerized scale and mixer control. Process and QC data are collected in a single, searchable database for trend analysis and root cause identification. The plant has internal mixers with over 8 million pounds of capacity and has broadened its product offering and material expertise into high performance thermoplastics with the addition of an Inconel twin-screw compounding line sized for both development and specialty production supply.
While Cri-Tech’s internal focus is on quality, their external focus is on you. They tailor their services to match both your material performance and delivery requirements.