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sofprene T wheels

Sofprene T ® (SBS)

Styrene-Butadiene-Styrene Compound

Sofprene T® is a Thermoplastic Elastomer (TPE) obtained by deeply mixing an elastomeric phase, consisting of SBS (block copolymer Styrene-Butadiene-Styrene) rubber to a plastic phase which is usually made either of polyolefinic or styrenic polymers.

Its plastic phase allows Sofprene T® to be processed in an easy and inexpensive way by means of traditional technologies used for thermoplastic materials and to be fully recyclable, whereas its elastomeric phase features typically rubber-like specifications such as excellent elastic recovery and softness. Sofprene T® can successfully preserve such characteristics even at very low temperature (-50°C).
The unsaturated nature of the SBS rubber makes Sofprene T® vulnerable to UV-rays, heat and ozone, however, it is possible to improve its resistance to these agents by using proper additives.

Sofprene T® has many interesting characteristics and is available in a wide range of materials:
  • Wide hardness range from 25 ShA to 40 ShD scale
  • Density from 0,9 g/cm3 to 1,25 g/cm3
  • Operating temperature from -50 °C to +60 °C
  • High elastic recovery both at low and room temperature
  • Excellent resistance to several chemical agents, i.e. bases, acids, alcohols, detergents, water solutions
  • High thermal and electric insulation values
  • Good abrasion resistance
  • Specific rheology for each type of process
  • Excellent colourability

Special grades featuring the following specifications are also available:
  • High transparency
  • Suitability for food contact
  • Adhesion on polystyrene (PS) and other polymers having a similar chemical nature
  • Additional protection against heat and UV-rays
  • Extrusion grades available on request, starting from 40ShA hardness

FURNITURE

Shock-absorbers for bed slats, wheels, anti-shocks profiles.

HOUSEHOLD

Non-slip mats, handles for tools, overmoulded rubber lips for dustpan and squeegees, plungers.

AGRICULTURE

Gaskets for drip devices.

TOYS

Wheels, handles, seats, little toys.
Sofprene T® is suitable for co-moulding and co-extrusion with polypropylene (PP) and its compounds. Some special grades for heat adhesion on polystyrene (PS) are also available.
Sofprene T® can be processed through injection-moulding and extrusion. Normally it does not require drying before processing, apart from some special grades.
PLASTICIZING SCREW: polyolefins screws having L/D ratio ≥ 20 and compression ratio ranging from 2.5 to 3.5:1 are the most suitable
PLASTICIZING SPEED: high
INJECTION SPEED: medium-high
INJECTION PRESSURE: medium
RUNNERS: it is advisable to use runners which are as short as possible, having a circular section and a gradually decreasing flow-through diameter
INJECTION POINTS: usually having circular section and diameter ≥ 0.7 mm. We recommend not to use injection points having a diameter <0.3 mm without prior selection of the appropriate grades to be agreed with SO.F.TER. Technical Support
AIR VENTS: the mould should be provided with appropriate air vents (diameter 0.03 - 0.05 mm)
SHRINKAGE: generally ranging from 0,4% to 1,5% depending on the material hardness
DRYING: usually not necessary

INJECTION MOULDING INDICATIVE TEMPERATURES:
Hardness < 55 ShA : 1st Zone 150 °C | 2nd Zone 160 °C | 3rd Zone 170 °C | Nozzle 175 °C | Mould 20-40 °C
Hardness 55-85 ShA: 1st Zone160 °C | 2nd Zone 170 °C | 3rd Zone 180 °C | Nozzle 185 °C | Mould 20-40 °C
Hardness > 85 ShA: 1st Zone165 °C | 2nd Zone 175 °C | 3rd Zone 180 °C | Nozzle 195 °C | Mould 20-40 °C
PLASTICIZING SCREW: single screw having L/D ratio from 18:1 to 24:1 and compression ratio ranging from 1,5 to 3
DIE: a land of < 10 mm is advisable
BREAKER PLATE: 60 or 80 Mesh
DRYING: usually not necessary

EXTRUSION INDICATIVE TEMPERATURES:
Hardness < 75 ShA: 1st Zone 160 °C | 2nd Zone 170 °C | 3rd Zone 180 °C | Head 180 °C | Die 170 °C
Hardness > 75 ShA: 1st Zone 170 °C | 2nd Zone 175 °C | 3rd Zone 185 °C | Head 190 °C | Die 180 °C
Sofprene T® is a fully recyclable material and it can be reused after regrinding. The user shall always verify that the compound obtained by mixing virgin and reground material is suitable for the specific application and meets the requirements.
This product should be stored in a covered facility and kept away from moisture and heat.
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