Espolex® WT557A

1 of 23 products in this brand

Espolex® WT557A is a thermoplastic elastomer with superior low-temperature ductility. It is used for various applications such as air bag covers, painted applications, and injection molded parts. This product is suitable for Injection molding. Applications: Airbag Covers Painted applications Interior Trim Handle Grips Features: Superior low-temperature ductility Benefits: High performance from a mechanical property standpoint.

Polymer Name: Thermoplastic Elastomer (unspecified)

Processing Methods: Injection Molding

End Uses: Airbag Cover

Density: 888.0 - 888.0 kg/m³

Tear Strength: 90.0 - 90.0 kN/m

Technical Data Sheet Safety Data Sheet

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Identification & Functionality

Polymer Name: Thermoplastic Elastomer (unspecified)
Technologies: Elastomers
Product Families: Elastomers — Thermoplastic Elastomers
Other Thermoplastic Elastomers

Features & Benefits

Materials Features: Excellent Low Temperature Ductility

Applications & Uses

Markets: Automotive & Transportation
Applications: Automotive & Transportation — Automotive
Safety Systems
Plastics & Elastomers End Uses: Airbag Cover
Plastics & Elastomers Processing Methods: Injection Molding

Properties

Physical Properties

	Value	Units	Test Method / Conditions
Density	0.888	g/cm³	ISO 1183
Melt Flow (230°C/2.16Kg)	7	g/10min	ISO 1133
Flexural Modulus	470	MPa	ISO 178
Tensile Strength (500mm/min, Type 1)	13	MPa	ISO 37
Tensile Elongation (500mm/min, Type 1)	450	%	ISO 37
Izod Impact Strength (at -50°C)	No Break	J/m	ASTM D256
Tear Strength	90	kN/m	ISO 34-1B
Brittle Temperature	max. -60	°C	ASTM D746
Mold Shrinkage (Tested on a basic plaque tool under optimum molding conditions)	0.007 - 0.011	in/in & mm/mm	Sumitomo Method

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

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

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