OVERVIEW
Farrprene EF655A is a versatile medium-hardness compound for general-purpose flexible parts and two-shot overmoulding. Supplied as a natural filled grade optimised for extrusion, it pairs the soft-touch feel of rubber with the clean, fast processing of a thermoplastic - no curing, fully re-meltable scrap.
The grade delivers a tensile strength of 5 MPa, elongation at break of >800%, and a specific gravity of 1.150. A balanced melt flow (MFI 9.5 g/10 min at 190°C/5 kg) suits a wide processing window. Heat Stabilized.
This is a SEBS-based compound. SEBS is the hydrogenated form of SBS: removing the double bonds from the mid-block gives it substantially better resistance to UV, heat and oxidation, which is why it is the usual choice for parts that see sunlight, warm service or a long design life.
At 32 g/10 min (230°C/5 kg) it flows more freely than a typical extrusion grade, which helps on complex dies but leaves less melt strength for tall unsupported sections. Its specific gravity of 1.150 reflects the mineral filler loading, which is what buys the dimensional stability and cost position of a filled grade.
TECHNICAL PROPERTIES
- HARDNESS
- 65 Shore A
- TENSILE STRENGTH
- 5 MPa
- ELONGATION AT BREAK
- >800%
- SPECIFIC GRAVITY
- 1.150
- MFI (230°C / 5 KG)
- 32 g/10 min
- MFI (190°C / 5 KG)
- 9.5 g/10 min
- APPEARANCE
- Natural
Typical average values from a limited sample set; not a formal specification. Request the signed datasheet for current values.
TYPICAL APPLICATIONS
- Two-shot overmoulding onto PP/PE and rigid substrates
- General-purpose seals, grips and flexible housings
- Cable jacketing and strain reliefs
- Automotive interior trim, NVH and sealing components
- Construction profiles, gaskets and weatherstripping
PROCESSING
- Suited to profile, sheet and tube extrusion lines with conventional single-screw setups.
- Filled formulation tuned for cost-efficiency and dimensional stability.
- Heat-stabilised: the additive package is intended to limit degradation during processing and repeated re-melting of regrind.
- SEBS-based: the hydrogenated backbone gives better UV, thermal and oxidative stability than an SBS compound.
- Colour-matchable and re-processable - production scrap can be re-melted and reused.