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No special storage precautions noted. Material is stable under normal conditions. Avoid contact with oxidizing agents. Use container made of: Plastic film (outer packaging - cardboard box) For further information, refer to Section 10: "Stability and Reactivity".Please consult the Safety Data Sheet of this product.ELV;GADSL;Heavy Metals;RoHS


BLUESIL MF 670 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


ELV;GADSL;Heavy Metals;RoHS


  • 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 Bluestar Silicones Colour Base for HCR.


Extrusion, moulding and injection of articles with good mechanical properties and notably 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

For information about Storage and Shelf Life for this product, please download the Technical Data Sheet.




Density1.18MonocompISO 2781g/cm3
Elongation370MonocompNF ISO 37%
Hardness72MonocompASTM D 2240sh.A
Tensile strength7.8MonocompNF ISO 37MPa
Compression set13MonocompNF ISO 37%


































Rubber General Guide General Guide