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Specialty Compounds RTP Company

Covestro Texin® STX Thermoplastic Polyurethanes (TPU)
Categories: Polymer; Thermoplastic; Polyurethane, TP

Material Notes: Characterization: Texin STX resin is an opaque, high performance thermoplastic polyurethane which possesses the stiffness and modulus of standard engineering thermoplastics.

Properties / Applications: Texin STX resin exhibits excellent heat and chemical resistance. Other key attributes of Texin STX TPU include good impact resistance, low moisture absorption, low mold shrinkage, a low coefficient of thermal expansion, and good heat and abrasion resistance. It can be processed by injection molding or extrusion. Typical applications include couplings, valves, fittings, sunglass frames, and housings for personal electronic devices. As with any product, use of Texin STX resin in a given application must be tested (including field testing, etc.) in advance by the user to determine suitability.

Information provided by Covestro

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Physical PropertiesMetricEnglishComments
Specific Gravity 1.22 g/cc1.22 g/ccASTM D792
Water Absorption 0.23 %
@Time 86400 sec
0.23 %
@Time 24.0 hour
ASTM D570
Linear Mold Shrinkage, Flow 0.0050 cm/cm
@Thickness 2.54 mm
0.0050 in/in
@Thickness 0.100 in
ASTM D955
 
Mechanical PropertiesMetricEnglishComments
Hardness, Rockwell M 5050ASTM D785
Hardness, Rockwell R 110110ASTM D785
Tensile Strength at Break 47.0 MPa6820 psiASTM D638
Tensile Strength, Yield 62.0 MPa8990 psiASTM D638
Elongation at Break 85 %85 %ASTM D638
Elongation at Yield 6.8 %6.8 %Strain at Maximum Stress; ASTM D790
 7.3 %7.3 %ASTM D638
Tensile Modulus 1.93 GPa280 ksiASTM D638
Flexural Strength 930 MPa135000 psiASTM D790
Flexural Modulus 2.00 GPa290 ksiASTM D790
 0.0830 GPa
@Strain 5.0 %
12.0 ksi
@Strain 5.0 %
ASTM D790
Izod Impact, Notched  1.87 J/cm
@Thickness 3.17 mm,
Temperature -30.0 °C
3.50 ft-lb/in
@Thickness 0.125 in,
Temperature -22.0 °F
ASTM D256
 8.54 J/cm
@Thickness 3.17 mm,
Temperature 23.0 °C
16.0 ft-lb/in
@Thickness 0.125 in,
Temperature 73.4 °F
ASTM D256
Izod Impact, Unnotched 33.1 J/cm
@Thickness 3.17 mm
62.0 ft-lb/in
@Thickness 0.125 in
ASTM D48
 
Thermal PropertiesMetricEnglishComments
CTE, linear 75.6 µm/m-°C42.0 µin/in-°FASTM D696
Deflection Temperature at 0.46 MPa (66 psi) 80.0 °C176 °FASTM D648
Deflection Temperature at 1.8 MPa (264 psi) 73.0 °C163 °FASTM D648
Vicat Softening Point 105 °C221 °FRate A; ASTM D1525
 
Processing PropertiesMetricEnglishComments
Rear Barrel Temperature 225 - 250 °C437 - 482 °FExtrusion
 235 - 246 °C455 - 475 °FInjection
Middle Barrel Temperature 225 - 240 °C437 - 464 °FExtrusion
 238 - 249 °C460 - 480 °FInjection
Front Barrel Temperature 225 - 240 °C437 - 464 °FExtrusion
 238 - 249 °C460 - 480 °FInjection
Nozzle Temperature 243 - 254 °C469 - 489 °FInjection
Die Temperature 230 - 240 °C446 - 464 °FExtrusion
Melt Temperature 230 °C446 °FExtrusion
 235 - 250 °C455 - 482 °FInjection
Mold Temperature 43.0 - 66.0 °C109 - 151 °FInjection
Injection Pressure 41.4 - 96.5 MPa6000 - 14000 psiInjection
Back Pressure <= 5.52 MPa<= 800 psiInjection
Cushion <= 0.317 cm<= 0.125 inInjection

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PCOVEST1000 / 202783

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