TPU Covestro 1209

TPU Covestro 1209 is thermoplastic polyurethane elastomer, available in polyester‑based and polyether‑based versions. It features broad hardness range (60HA‑85HD), good abrasion‑resistance, oil‑resistance, transparency and elasticity, coupled with high tensile strength and tear resistance.

Main Applications

Footwear: shoe soles, insoles, buffer components. Industrial parts: seals, gaskets, rollers, transmission belts. Tubes & profiles: hoses, conduits, cable jackets. Automotive parts: dust‑boots, vent blades and other consumer goods.

Physical Properties

Property Category	Item	Test Condition	Test Standard	Typical Reference Data	Unit
Physical Properties	Specific gravity / Density	—	ASTM D792	1.07	g/cm³
Mechanical Properties	Shore Hardness	—	ASTM D2240	70	Shore A
	Tensile Strength	—	ASTM D412	25.5	MPa
	Elongation at Break	—	ASTM D412	770	%
	Flexural Modulus	23℃	ASTM D790	18.6	MPa
	Tear Strength	—	ASTM D624	60.5	kN/m
Thermal Properties	Glass Transition Temperature	—	—	‑57	℃
	Vicat Softening Temperature	—	ASTM D1525	75	℃
Other Properties	Compression Set	22 h	ASTM D395B	30	%
	Abrasion Loss	—	ASTM D3489	7	mg
	Molding Shrinkage (flow direction)	—	ASTM D955	0.008	mm/mm

Processing Parameters

Process	Parameter	Unit	Reference Range	Remarks
Pre‑drying	Drying temperature	℃	80‑110	Circulating hot‑air drying recommended; TPU is moisture‑sensitive, drying is mandatory
	Drying time	h	≥3	Until moisture＜0.05%
	Material bed thickness	mm	≤30	Guarantee drying efficiency
Injection molding	Rear feed zone temp	℃	150‑175	Reference for 85A‑98A grades; avoid premature plasticization
	Middle compression zone temp	℃	160‑185	Adjust according to formulation & equipment
	Front metering zone temp	℃	170‑195	Adjust according to formulation & equipment
	Nozzle temperature	℃	Equal‑to‑slightly lower than front zone	Prevent drooling or cold‑plug blockage
	Melt temperature	℃	170‑195	Strictly prohibit＞240℃ to avoid degradation; avoid long‑term melt residence
	Mold temperature	℃	25‑45
	Injection pressure	bar	50‑100	Keep as low as possible while full filling
	Hold‑pressure	bar	30%‑60% of injection pressure	Excessive hold‑pressure & long hold‑time shall be avoided to reduce internal stress
	Screw speed	rpm	50‑100	High speed causes shear overheating
	Back pressure	bar	5‑15	Improve melt homogeneity; excessive back‑pressure generates extra heat

Note: All information above is for reference only!