Covestro Texin® 255 Thermoplastic Polyurethanes (TPU)

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Covestro Texin® 255 Thermoplastic Polyurethanes (TPU)
Categories:	Polymer; Thermoplastic; Polyurethane, TP
Material Notes:	Texin 255 resin is a polyester-based thermoplastic polyurethane with a Shore hardness of approximately 55D. It can be processed by injection molding; extrusion processes are not recommended. Properties / Applications: Texin 255 natural color resin complies with FDA food-contact regulations 21 CFR 177.1680 (Polyurethane Resins) and 177.2600 (Rubber Articles Intended for Repeated Use), for use in articles that contact food except articles used for packing or holding food during cooking, subject to the limitations of these and any other applicable regulations. Texin 255 resin offers excellent fuel and oil resistance, as well as outstanding abrasion resistance, impact strength, toughness, and flexibility. Typical applications include toplifts, seals, gaskets, sleeves, casters, and gears. Information provided by Covestro
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Physical Properties	Metric	English	Comments

Specific Gravity	1.21 g/cc	1.21 g/cc	ASTM D792
Linear Mold Shrinkage, Flow	0.0080 cm/cm @Thickness 2.54 mm	0.0080 in/in @Thickness 0.100 in	ASTM D955
Linear Mold Shrinkage, Transverse	0.0080 cm/cm @Thickness 2.54 mm	0.0080 in/in @Thickness 0.100 in	ASTM D955

Mechanical Properties	Metric	English	Comments
Hardness, Shore D	55	55	ASTM D2240
Tensile Strength at Break	63.4 MPa	9200 psi	ASTM D412
Tensile Stress at Strain	12.4 MPa @Strain 50 %	1800 psi @Strain 50 %	ASTM D412
	15.9 MPa @Strain 100 %	2310 psi @Strain 100 %	ASTM D412
	32.4 MPa @Strain 300 %	4700 psi @Strain 300 %	ASTM D412
Elongation at Break	500 %	500 %	ASTM D412
Flexural Modulus	0.0517 GPa @Temperature 70.0 °C	7.50 ksi @Temperature 158 °F	ASTM D790
	0.0689 GPa @Temperature 23.0 °C	9.99 ksi @Temperature 73.4 °F	ASTM D790
	1.207 GPa @Temperature -30.0 °C	175.1 ksi @Temperature -22.0 °F	ASTM D790
Compressive Strength	1.00 MPa	145 psi	2% Deflection; ASTM D 575
	3.90 MPa	566 psi	5% Deflection; ASTM D 575
	7.40 MPa	1070 psi	10% Deflection; ASTM D 575
	10.1 MPa	1460 psi	15% Deflection; ASTM D 575
	12.7 MPa	1840 psi	20% Deflection; ASTM D 575
	15.5 MPa	2250 psi	25% Deflection; ASTM D 575
	40.6 MPa	5890 psi	50% Deflection; ASTM D 575
Resilience	40	40	[%], Bayshore; ASTM D2632
Shear Strength	38.51 MPa	5585 psi	ASTM D732
Dart Drop, Total Energy	50.0 J @Thickness 2.54 mm, Temperature -30.0 °C	36.9 ft-lb @Thickness 0.100 in, Temperature -22.0 °F	5 ph, 3-in clamp; ASTM D3763
	57.8 J @Thickness 2.54 mm, Temperature 23.0 °C	42.6 ft-lb @Thickness 0.100 in, Temperature 73.4 °F	5 ph, 3-in clamp; ASTM D3763
Tear Strength	157.6 kN/m	899.3 pli	Die C; ASTM D624
Taber Abrasion, mg/1000 Cycles	50 @Load 1.00 kg	50 @Load 2.20 lb	[mg] Loss, H-18; ASTM D3489
Compression Set	15 % @Temperature 23.0 °C, Time 79200 sec	15 % @Temperature 73.4 °F, Time 22.0 hour	postcured; ASTM D395-B
	20 % @Temperature 23.0 °C, Time 79200 sec	20 % @Temperature 73.4 °F, Time 22.0 hour	as molded; ASTM D395-B
	35 % @Temperature 70.0 °C, Time 79200 sec	35 % @Temperature 158 °F, Time 22.0 hour	postcured; ASTM D395-B
	50 % @Temperature 100 °C, Time 79200 sec	50 % @Temperature 212 °F, Time 22.0 hour	postcured; ASTM D395-B
	65 % @Temperature 70.0 °C, Time 79200 sec	65 % @Temperature 158 °F, Time 22.0 hour	as molded; ASTM D395-B
	75 % @Temperature 100 °C, Time 79200 sec	75 % @Temperature 212 °F, Time 22.0 hour	as molded; ASTM D395-B

Thermal Properties	Metric	English	Comments
CTE, linear	131 µm/m-°C	73.0 µin/in-°F	ASTM D696
Deflection Temperature at 0.46 MPa (66 psi)	59.0 °C	138 °F	ASTM D648
Vicat Softening Point	138 °C	280 °F	Rate A; ASTM D1525
Brittleness Temperature	>= -55.6 °C	>= -68.0 °F	ASTM D746
Glass Transition Temp, Tg	-26.0 °C	-14.8 °F
Flammability, UL94	HB @Thickness 1.50 mm	HB @Thickness 0.0591 in

Processing Properties	Metric	English	Comments
Rear Barrel Temperature	193 - 210 °C	379 - 410 °F
Middle Barrel Temperature	193 - 216 °C	379 - 421 °F
Front Barrel Temperature	199 - 221 °C	390 - 430 °F
Nozzle Temperature	204 - 227 °C	399 - 441 °F
Melt Temperature	210 °C	410 °F
Mold Temperature	15.0 - 40.0 °C	59.0 - 104 °F
Injection Pressure	41.4 - 103 MPa	6000 - 15000 psi

Compliance Properties	Metric	English	Comments
FDA	Yes	Yes

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PCOVEST0976 / 202759

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