Ultrapolymers
Tuesday, July 29, 2025
Lupolen 4261AG
Units 
LyondellBasell Industries - High Density Polyethylene
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General Information
Product Description
Lupolen 4261AG is a high molecular weight high density polyethylene. Typical customer applications include automotive fuel tanks. It is supplied in pellets and is stabilized with antioxidants for the extrusion process. The product features an outstanding Environmental Stress Cracking Resistance (ESCR), good chemical resistance in combination with an excellent low temperature impact resistance. Typical processes include blow molding and thermoforming.

Lupolen 4261AG is not intended for use in medical and pharmaceutical applications. The product can not be used for food contact applications.
General  
Material Status 
  • Commercial: Active
Availability 
  • Africa & Middle East
  • Asia Pacific
  • Europe
  • Latin America
  • North America
Additive 
  • Antioxidant
Features 
  • Antioxidant
  • High ESCR (Stress Crack Resist.)
  • High Impact Resistance
Uses 
  • Automotive Applications
  • Fuel Tanks
  • Tanks
Processing Method 
  • Extrusion Blow Molding
  • Thermoforming
  
ASTM & ISO Properties 1
Physical
Nominal Value
Unit
Test Method
Density (-5°C)
0.945
g/cm³
 ASTM D1505
Density
0.945
g/cm³
 ISO 1183
Apparent (Bulk) Density
> 0.50
g/cm³
 ISO 60
Melt Mass-Flow Rate (MFR) (190°C/21.6 kg)
6.0
g/10 min
 ASTM D1238
Melt Mass-Flow Rate (MFR) (190°C/21.6 kg)
6.0
g/10 min
 ISO 1133
Environmental Stress-Cracking Resistance (ESCR)
      
10% Igepal, F10
1000
hr
 ASTM D1693B
100% Igepal, F50
> 2000
hr
 ASTM D1693A
FNCT - 4.0 MPa, 6.6% Dehyton PL (80°C)
23.0
hr
 ISO 16770
Mechanical
Nominal Value
Unit
Test Method
Tensile Modulus
900
MPa
 ISO 527-1
Tensile Strength 2 (Yield)
23.1
MPa
 ASTM D638
Tensile Stress (Yield)
24.0
MPa
 ISO 527-2
Tensile Strain (Yield)
10
%
 ISO 527-2
Tensile Elongation 2 (Break)
600
%
 ASTM D638
Flexural Modulus
1070
MPa
 ASTM D790
Flexural Modulus
1100
MPa
 ISO 178
Impact
Nominal Value
Unit
Test Method
Tensile Impact Strength 3 (-30°C)
170
kJ/m²
 ISO 8256/1A
Thermal
Nominal Value
Unit
Test Method
Vicat Softening Temperature
126
°C
 ISO 306/A50
Melting Temperature
131
°C
 ISO 11357-3
Oxidation Induction Time (200°C)
50
min
 ISO 11357-6
Processing Information
Injection
Nominal Value
Unit
 
Processing (Melt) Temp
180 to 240
°C
  
Notes
1Typical properties: these are not to be construed as specifications.
2Type IV, 50 mm/min
3Notched
 
Customer is responsible for determining whether products and the information in this document are appropriate for Customer’s use and for ensuring that Customer’s workplace and disposal practices are in compliance with applicable laws and other governmental enactments. Seller assumes no obligation or liability for the information in this document. NO WARRANTIES ARE GIVEN; ALL IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE ARE EXPRESSLY EXCLUDED.