Following is a fact sheet which can help you make the right material choice for fluoroelastomers:
A or E Form of FKM
It is the oldest and one of the most common elastomers amongst the FKMs product line. These most often have a fluorine content upto 66% and are supplied for the common aerospace specifications. The A or E type show low compression set with non-resistance to flex fuels having high-levels of alcohol or MBTE. Also, these grades are known to be the general purpose FKMs. `
B Form of FKM
B form of FKM was basically developed to increase the fluorine content so as to provide better fluid resistance against acids and flex fuels as compared to A or E types. These comprise of 67% of fluorine content and are used in situations where resistance against flex fuels with alcohol or MTBE is required.
GF or F Form of FKM
It is an extended wing of B form of FKM along with increased fluorine content for better fuel and solvent resistance. With 70% fluorine content, these are extensively used in agricultural sector where strong chemicals are used on a daily basis.
GLT Form of FKM
This type was developed to improvise the low temperature flexibility in comparison to age old A or E type FKMs. The flexibility of low temperature generally reaches � 40 degree Fahrenheit. These comprise of 65% of fluorine content and are unfit for aggressive solvents or flex fuels.
GFLT Form of FKM
GFLT form of FKM is appropriate for flex fuel applications as these have 68% of fluorine content and 35 degree Fahrenheit of rating.
Check out our article FFKM Performance and Application for more information on FFKM.
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