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Plastics & Elastomers
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Arnite® BM4 240

Technical Datasheet | Supplied by DSM
Arnite® BM4 240 by DSM is a lubricated polybutylene terephthalate and polyethylene terephthalate (PBT + PET) grade reinforced with 20% mineral fiber. It is suitable for processing by injection molding. Offers durability, excellent dimensional stability, high thermal and oxidative stability, high stiffness, low wear-loss, low coefficient of friction and low moisture absorption. Arnite® BM4 240 provides high crystallinity to ensure rapid cooling times, outstanding creep properties and excellent dielectric strength at elevated temperatures. Shows resistance against heat, aliphatic hydrocarbons, motor vehicle fuels, oils and greases, dilute acids and bases, detergents and salt solutions. Meets ISO 1043 for PBT.
Product Type
Polyester > PBT + PET
Product Status
Geographical Availability
Central and Eastern Europe, Western Europe
Applications/ Recommended for
Injection molding - thermoplastics
Labels/Agency Rating
ISO 1043 PBT
Key Features
  • Acid Resistant
  • Lubricated
  • Filled, Mineral
  • Dimensional stability, Good
  • Base Resistant
  • Grease Resistant
  • Fuel Resistant
  • Hydrocarbon Resistant
  • Oil Resistant
  • Crystalinity, High
  • Heat Resistance, High
  • Friction, Low
  • Moisture Absorption, Low
  • Stiffness, High
  • Durable
  • Creep Resistance, Good

Arnite® BM4 240 Properties

Mechanical Properties

Value & Unit
Test Condition
Test Method
Impact Strength, Charpy
30 kJ/m²
ISO 179/1eU
Impact Strength, Notched Charpy
2 kJ/m²
ISO 179/1eA
Tensile Modulus
4500 MPa
( )
ISO 527-1/2

Arnite® BM4 240 Processing Guidelines

Injection Molding Properties

Value & Unit
Test Condition
Test Method
Mold Temperature
60 - 100 °C
Center Temperature
230 - 250 °C
Nozzle Temperature
240 - 260 °C

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