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Grade: Low Density Polyethylene (LDPE)
Formula: LDPE
Form: Granule
Material: Polyethylene (PE)
CAS Number: 9002-88-4
Commodity: Polymers
Nominal Granule Size: 5mm
Melt Flow Rate (MFR): 2g/10min
Color: Black

Extrusion and injection moulding grade LDPE Granules

Extrusion and Injection Moulding Grade LDPE Granules are low-density polyethylene materials designed for thermoplastic processing with excellent flexibility, impact resistance, and chemical inertness. These granules exhibit low crystallinity, a softening point around 105°C, and high elongation at break, making them ideal for forming complex geometries and film-based structures. LDPE is extensively used in packaging films, cable insulation, laboratory tubing, and injection-moulded consumer goods. In injection moulding, LDPE’s low viscosity and thermal stability support the efficient production of soft components such as squeeze bottles and lids. Additionally, it finds use as a binder in powder injection moulding for ceramics, where its branched molecular structure improves flow properties and reduces thermal debinding time by up to 40%. Recent advancements have also enabled sustainable reprocessing of LDPE through ultrahigh-speed extrusion, lowering embodied energy and CO₂ emissions in moulded parts. This grade of LDPE granules remains central to both conventional plastics manufacturing and evolving circular economy models in polymer engineering.
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Material Properties for Polymers

Chemical Resistance
Element Value
Acids - concentrated Good-Fair
Acids - dilute Good
Alcohols Good
Alkalis Good
Aromatic hydrocarbons Fair-Poor
Greases and Oils Good-Fair
Halogenated Hydrocarbons Fair-Poor
Halogens Fair-Poor
Ketones Good-Fair
Electrical Properties
Element Value
Dielectric constant @1MHz 2.2-2.35
Dissipation factor @ 1MHz 1-10x 10⁻⁴
Dielectric strength( kV mm⁻¹ ) 27
Surface resistivity( Ohm/sq ) 10¹³
Volume resistivity( Ohmcm ) 10¹⁵-10¹⁸
Physical Properties
Element Value
Flammability HB
Radiation resistance Fair
Refractive index 1.51
Resistance to Ultra-violet Poor
Limiting oxygen index( % ) 17
Water absorption - over 24 hours( % ) 0.015
Density( gcm⁻³ ) 0.92
Mechanical Properties
Element Value
Hardness - Rockwell D41-46 - Shore
Elongation at break( % ) 400
Tensile modulus( GPa ) 0.1-0.3
Izod impact strength( J m⁻¹ ) 1000
Tensile strength( MPa ) May-25
Thermal Properties
Element Value
Heat-deflection temperature - 0.45MPa( C ) 50
Heat-deflection temperature - 1.8MPa( C ) 35
Lower working temperature( C ) -60
Upper working temperature( C ) 50-90
Specific heat( J K⁻¹ kg⁻¹ ) 1900-2300
Thermal conductivity( W m⁻¹ K⁻¹ ) 0.33@23°C
Coefficient of thermal expansion( x10⁻⁶ K⁻¹ ) 100-200

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