company tower banner
Sumika Polymers North America, LLC & Sumika Polymer Compounds Europe, LLC Company Logo

Espolex® WT521

Espolex® WT521 is a thermoplastic elastomer with strong weld-line strength and great value. It is used for air bag covers, interior trim, and injection molded parts. This product is suitable for Injection Molding.     Applications: Air Bag Covers  Interior Trim    Features: Strong weld/knit line strength    Benefits: Great value and performance balance.

Brand: Espolex (23 products)

Polymer Name: Thermoplastic Elastomer (unspecified)

Processing Methods: Injection Molding

End Uses: Airbag Cover, Automotive Interior Trim

Density: 880.0 - 880.0 kg/m³

Tear Strength: 110.0 - 110.0 kN/m

Enhanced TDS

Knowde-enriched technical product data sheet

Identification & Functionality

Features & Benefits

Materials Features

Applications & Uses

Properties

Physical Properties
ValueUnitsTest Method / Conditions
Density0.88g/cm³ISO 1183
Melt Flow (230°C/2.16Kg)5.5g/10minISO 1133
Flexural Modulus460MPaISO 178
Tensile Strength (500mm/min, Type 1)15MPaISO 37
Tensile Elongation (500mm/min, Type 1)450%ISO 37
Izod Impact Strength (at -35°C)min. 50kJ/m²ISO 180
Tear Strength110kN/mISO 34-1B
Brittle Temperaturemax. -60°CASTM D746
Mold Shrinkage (Tested on a basic plaque tool under optimum molding conditions)0.007 - 0.009in/in & mm/mmSumitomo Method

Regulatory & Compliance

Technical Details & Test Data

Tool Design Guidelines
Wall Thickness (WT) 2 – 4 mm
Gate Type Fan Gate
Gate Thickness (GT) 0.6 – 0.9 x WT
Gate Width (GW) > 2 x GT
Gate Land (GL) < 0.75 mm
Runner Type Round
Sprue “O” Diameter 3.5 x WT
Main-Runner (SR) 2.5 x WT
Secondary-Runner (MR) 1.5 x WT
Draft 3° – 6 ° per side
Inside Radius (IR) WT / 2
Outside Radius (OR) WT + IR
Surface Texture Light Stipple
Surface Coating Nickel / Teflon
Vent Quantity 1 Every Inch
Vent Depth

0.013 – 0.025 mm

Vent Width 5 mm
Processing Guidelines
Nozzle Temp. (°F) 390 – 470
Front Zone (°F) 390 – 470
Middle Zone (°F) 370 – 450
Rear Zone (°F) 350 – 430
Mold Temp. (°F) 70 – 120
Injection Speed Fast
Screw RPM Slow
Injection Pressure (%)

20% more than actual transfer pressure

Back Pressure (psi) 50 – 100
Pack/Hold Pressure

40 – 80% of Injection Pressure