Tecnoflon® FOR 4391 is a medium viscosity cure incorporated fluoroelastomer terpolymer (FKM) with high fluorine content (70% wt). Tecnoflon® FOR 4391 is designed for applications requiring outstanding fuel and chemical resistance. 
Some of the basic properties of Tecnoflon® FOR 4391 are: 
- Good scorch safety 
- Reduced mold fouling 
- Excellent mold release 
- Excellent resistance to fuels 
- Very good heat resistance 
- Very good compression set 
Tecnoflon® FOR 4391 can be used for compression, injection and transfer moulding of shaft seals, valve stem seals, gaskets or any item requiring excellent chemical resistance. This material can be combined with the cure system and other typical fluoroelastomer compounding ingredients. Mixing can be accomplished with two-roll mills or internal mixers. Tecnoflon® FOR 4391 can be extruded into hoses or profiles and can be calendered to make sheet stocks or belting. Finished goods can be produced by a variety of rubber processing methods. 


  • Global Business Unit
    Specialty Polymers
  • Brand
  • Synonyms



Segments Applications
Powertrain Efficiency Transmission Parts

Chemical categories

Chemical category Chemical family Chemical product
Specialty Polymers Fluorinated Elastomers FKM (Fluoroelastomer)

Region of commercial availability

  • Asia / Pacific
  • Europe / Middle East / Africa
  • North America
  • Latin America

Download documentation for Tecnoflon® FOR 4391