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DuPont Selar® PT 4274 Polyester Barrier Resin  (discontinued **)
Categories: Polymer; Film; Thermoplastic; Polyester, TP; Polyester Film

Material Notes: Selar® PT 4274 is a toughened homopolymer polyester resin in the high melt viscosity (HMV) series designed for thermoplastic processes. The HMV modification changes the rheology of the melt and provides better processibility in extrusion operations. It can be processed in conventional extruders designed for polyolefins or polyesters.

Information provided by DuPont Packaging Polymers.

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Physical PropertiesOriginal ValueComments
Density 1.30 g/ccASTM D1505
Moisture Vapor Transmission 1.20 cc-mm/m²-24hr-atm
Oxygen Transmission 4.90 cc-mm/m²-24hr-atm
Viscosity 800000 cP
@Shear Rate 100 1/s,
Temperature 270 °C
 
Mechanical PropertiesOriginal ValueComments
Film Tensile Strength at Yield, MD 35.2 MPaASTM D882
Film Tensile Strength at Yield, TD 27.6 MPaASTM D882
Film Elongation at Break, MD 440 %ASTM D882
Film Elongation at Break, TD 445 %ASTM D882
Secant Modulus, MD 1.72 GPaASTM D882
Secant Modulus, TD 1.76 GPaASTM D882
Impact 5.2J/mm Spencer Impact; ASTM D3420
Coefficient of Friction 0.20film/metal; ASTM D1894
Graves Tear Strength 219 kN/mTD; ASTM D1004
 233 kN/mMD; ASTM D1004
Elmendorf Tear Strength, MD 21.0 g/mil50 µm (2 mil) film; ASTM D1922
Elmendorf Tear Strength, TD 22.0 g/mil50 µm (2 mil) film; ASTM D1922
Seal Strength 3000 g/25 mmseal bar 149°C.
Film Tensile Strength at Break, MD 41.0 MPaASTM D882
Film Tensile Strength at Break, TD 41.0 MPaASTM D882
 
Thermal PropertiesOriginal ValueComments
Melting Point 255 °CDSC/ASTM D3418
Glass Transition Temp, Tg 75.0 °CASTM D3418
 
Processing PropertiesOriginal ValueComments
Melt Temperature 268 - 279 °C
Drying Temperature 121 - 135 °C
Dry Time 6 - 8 hourto < 0.005% moisture.

**
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