BLUESIL MF 660 U may be stored at temperatures between -5°C / 23°F and 40°C / 104°F for up to 18 months from its date of manufacturing.Please consult the Safety Data Sheet of this product.


BLUESIL MF 660 U is a Silicone Master batch, heat curing after addition of a vulcanisation agent (chosen according to the processing method).

Chemical Protection;Heat Protection;High Temperature Protection;Protection;Sealing

HCR Masterbatch


  • Very slight refreshening after prolonged storage.
  • Very easy demoulding
  • No or very little post-curing.
  • Good compromise between tear strength and compression set
  • Good heat stability up to
  • Oil resistance
  • Easy to obtain bright colours using Colour Base for HCR.


Moulding, extrusion and injection of articles with good mechanical properties and notably low compression set and good resilience (spark plug caps, hoses, connectics, various seals, building sections, etc.)
For extrusion applications, depending on processing conditions and geometry of the profile: the addition of 0,5 parts of BLUESIL ADD 916 improves the visual quality of profiles after vulcanization.

Asia Pacific;Europe Middle East Africa;Central and South America;North America




Density1.16MonocompISO 2781g/cm3
Elongation380MonocompNF ISO 37%
Hardness61MonocompASTM D 2240sh.A
Tensile strength7.2MonocompNF ISO 37MPa
Compression set11MonocompNF T 76102%




































Rubber General Guide General Guide