DuPont Selar® PT 4274 Polyester Barrier Resin

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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 Properties	Metric	English	Comments

Density	1.30 g/cc	0.0470 lb/in³	ASTM D1505
Moisture Vapor Transmission	1.20 cc-mm/m²-24hr-atm	3.05 cc-mil/100 in²-24hr-atm
Oxygen Transmission	4.90 cc-mm/m²-24hr-atm	12.4 cc-mil/100 in²-24hr-atm
Viscosity	800000 cP @Shear Rate 100 1/s, Temperature 270 °C	800000 cP @Shear Rate 100 1/s, Temperature 518 °F

Mechanical Properties	Metric	English	Comments
Film Tensile Strength at Yield, MD	35.2 MPa	5110 psi	ASTM D882
Film Tensile Strength at Yield, TD	27.6 MPa	4000 psi	ASTM D882
Film Elongation at Break, MD	440 %	440 %	ASTM D882
Film Elongation at Break, TD	445 %	445 %	ASTM D882
Secant Modulus, MD	1.72 GPa	249 ksi	ASTM D882
Secant Modulus, TD	1.76 GPa	255 ksi	ASTM D882
Impact	5.2	5.2	J/mm Spencer Impact; ASTM D3420
Coefficient of Friction	0.20	0.20	film/metal; ASTM D1894
Graves Tear Strength	219 kN/m	1250 pli	TD; ASTM D1004
	233 kN/m	1330 pli	MD; ASTM D1004
Elmendorf Tear Strength, MD	0.827 g/micron	21.0 g/mil	50 µm (2 mil) film; ASTM D1922
Elmendorf Tear Strength, TD	0.866 g/micron	22.0 g/mil	50 µm (2 mil) film; ASTM D1922
Seal Strength	3000 g/25 mm	3000 g/in	seal bar 149°C.
Film Tensile Strength at Break, MD	41.0 MPa	5950 psi	ASTM D882
Film Tensile Strength at Break, TD	41.0 MPa	5950 psi	ASTM D882

Thermal Properties	Metric	English	Comments
Melting Point	255 °C	491 °F	DSC/ASTM D3418
Glass Transition Temp, Tg	75.0 °C	167 °F	ASTM D3418

Processing Properties	Metric	English	Comments
Melt Temperature	268 - 279 °C	514 - 534 °F
Drying Temperature	121 - 135 °C	250 - 275 °F
Dry Time	6 - 8 hour	6 - 8 hour	to < 0.005% moisture.

**
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