The SILTEM™ Resin family of amorphous thermoplastic polyetherimide-siloxane (PEI-Si) copolymer resins combine the high heat performance of ULTEM™ resin (PEI) with the flexibility of silicone elastomers (Si). SILTEM resins have a transparent brown base color. The materials’ flexibility make them an excellent choice for both primary and secondary isolation in wire and cable applications. The materials can also be used in injection molding, profile - and film extrusion and blowmolding.
INTRINSIC HALOGEN FREE FLAME RETARDANT
SILTEM resins are intrinsically flame retardant and do not contain halogen based FR agents nor halogens in the backbone of the polymer The materials offer a Limited Oxygen Index LOI up to 48%. They do comply with RoHS and are e.g. compliant to VDE0472.
Different grades with different siloxane levels are available. The lowest modulus available is 470MPa in flex modulus (ISO178)
SILTEM resins offer continuous use temperatures up to 150degC and short term resistance up to 180degC.
Like ULTEM resin and other Polyimides, SILTEM resins offer very good retention of properties under nuclear radiation environment and are a good material of choice for wire and cable constructions that need to withstand such ionizing radiation.
In contrast to fluoropolymers SILTEM resins offer a wider process window and they do not need special precaution to avoid corrosion risk during extrusion. Conventional materials of construction can be used for extruder barrel, screw and die-head offering lower system cost due to lower CAPEX and maintenance cost.
SILTEM resins can be used as blend component in resin systems based on hard and flexible thermoplastic polyesters offering possibility to improve flexibility and bring FR properties to these materials. More advanced blends are possible with e.g. PEEK and PPS enabling increased flexibility for these resins.
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