HFFR compound consists of polyolefin matrix (Evatane® or Lotryl® resins), hydrated mineral filler (ATH, MDH) and coupling agent.
Orevac® is used as coupling agent:
The selection of the appropriate coupling agent is a key issue for HFFR compounds:
High levels of flame retardant additives affect the polymer matrix, which leads to low mechanical performance. This can be overcome by introducing Orevac® as a coupling agent between the polyolefin and filler.
Orevac® resins used as coupling agent increase tensile strength and elongation at break.
Orevac® resins improve air/water ageing and reduce compound viscosity.
HFFR standard formulations
|Filler acceptance||Flame resistant||Cohesion|
|ATH and MDH||
|Recommended Orevac® grades:|
|General purpose||XL automotive||Flexible cable||XL solar||HFFR PP based|
Arkema has also a complementary range of MAH terpolymers coupling agents sold under the name Lotader®
Grades are chosen upon the targeted properties.