MDPE LG Chem SP980 Resin

Material Introduction: MDPE LG Chem SP980 is a medium‑density polyethylene specially designed for hot‑cold water piping systems. Adopting advanced catalyst and molecular‑structure design, it fits heating‑floor and hot‑cold water‑supply pipe systems with strict requirements for long‑term pressure resistance, heat resistance and crack resistance. It is well‑known for excellent long‑term hydrostatic strength, outstanding slow‑crack‑growth resistance and favorable processability。

Main Applications

Floor‑heating piping systems: Manufacture of PE‑RT floor‑heating pipes, its classic and primary application. It can withstand long‑term cyclic exposure to high‑temperature hot water and pressure.

Hot‑cold water delivery pipes: Hot‑cold potable‑water pipes inside buildings for domestic and commercial water‑supply systems.

Al‑plastic composite pipes: Used as inner liner for producing PEX‑AL‑PERT composite pipes, combining corrosion resistance of plastic pipe and oxygen‑barrier property of metal pipe.

Performance Parameters

Performance Category	Test Item	Test Standard	Condition / Unit	Value / Range
Basic Properties	Melt Flow Rate (MFR)	ASTM D1238	190°C/2.16 kg, g/10min	0.6
	Density	ASTM D792	23°C, g/cm³	0.937‑0.938
Mechanical Properties	Tensile Yield Strength	ASTM D638	MPa (or kg/cm²)	19 (or 190)
	Tensile Strength at Break	ASTM D638	MPa (or kg/cm²)	34 (or 350)
	Elongation at Break	ASTM D638	%	700‑720
	Flexural Modulus	ISO 178 / ASTM D790	MPa (or kg/cm²)	550 (or 5 600)
	Cantilever Beam Notched Impact Strength	ASTM D256	23°C, 1/4", J/m	No break
	Shore Hardness	ASTM D2240 / ISO 868	Shore D	56‑57
Long‑term Properties	Environmental Stress‑Cracking Resistance (ESCR)	ASTM D1693	F₅₀, 50°C, hr	＞10 000
Thermal Properties	Vicat Softening Temperature	ASTM D1525	°C	123‑124
	Melting Point	LG Internal Method / DSC	°C	126

Molding Process

Processing Stage	Parameters	Recommended Range / Description
Drying	Necessity	Pre‑drying is normally unnecessary. If moisture is observed after opening bags under extremely humid storage conditions, dry at 60‑80°C for 1‑2 hours to prevent surface defects.
Extrusion	Barrel Temperature Profile	Feeding zone:160‑180°C；Compression zone:180‑200°C；Metering zone:200‑220°C；Die‑head & die:210‑230°C
	Melt Temperature	Recommended:200‑230°C. Avoid excessive temperature and long residence time to prevent material degradation.
	Screw Speed	Adjust according to pipe dimension and extruder size to achieve good plasticization and stable extrusion output.
Cooling	Sizing & Cooling	Vacuum sizing tank is required. Cooling water tank shall guarantee sufficient water volume and cooling efficiency. Water temperature is generally 10‑25 °C, ensuring pipe roundness, dimensional stability and minimizing internal stress.
Pulling	Pull‑off Speed	Pull‑off speed shall well match extrusion speed and remain stable for uniform wall thickness and straightness of pipes.

Disclaimer: All above data is for reference only.