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Plastics & Elastomers
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Arnitel® UM551

Technical Datasheet | Supplied by DSM
Arnitel® UM551 is a high-performance thermoplastic co-polyester (TPC) gradeby DSM. It is an impact modified, heat-, light- and UV stabilized grade. It is suitable for processing by film extrusion and injection molding. Possesses flexibility, strength, excellent processing characteristics, excellent mechanical properties, excellent elasticity, good resistance in heat ageing tests and permeability to water vapor. Shows high temperature-, thermal-, UV-, fungus- and fatigue resistance. Offers chemical resistance against household chemicals like cleaning agents, sunscreen lotion and automotive greases and oils. Arnitel® UM551 can withstand very high burst pressures and retains its properties better at higher temperatures than PA12. Used in auto electronics & electricals, furniture. Meets ISO 18064 for TPC-ES.
Product Type
  • Polyester TPE > COPE
  • Polyester [Polyester] > > Co-polyester
Physical Form
Product Status
Geographical Availability
Central and Eastern Europe, Western Europe
Applications/ Recommended for
  • Automotive
  • Furnitures
  • Injection molding - thermoplastics
  • Extrusion
Labels/Agency Rating
ISO 18064 TPC-ES
Key Features
  • UV-Stabilized
  • Chemical resistance, Good
  • Strength, Good
  • Thermal Stability, Good
  • Heat Aging Resistance, Good
  • UV Resistance, Good
  • Heat Resistance, High
  • Fungus Resistance
  • Light Stabilized
  • Impact modified
  • Heat stabilized
  • Processability, Good
  • Flexibility, Good
  • Fatigue Resistant
  • Elasticity, High

Arnitel® UM551 Properties

Physical Properties

Value & Unit
Test Condition
Test Method
Melt Mass-Flow Rate (MFR or MFI = Melt Flow Index or MI = Melt Index)
14 g/10 min
(At 230°C, 2.16 kg)
ISO 1133
Water Absorption
0.6 %
( )
ISO 62
Humidity Absorption
0.25 %
( )
ISO 62

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