MDPE SK DX800 Resin

Material Introduction: MDPE SK DX800 from South Korea is a medium‑density polyethylene grade. It features excellent environmental‑stress‑cracking resistance (ESCR), high toughness, good heat resistance and superior UV‑resistance stability. It is especially suitable for pipe applications requiring long‑term durability and reliability.

Main Applications

Pressure pipes: water pipes and gas pipes, where long‑term durability and crack resistance are critical.

Injection‑molded articles: industrial injection‑molded parts requiring good toughness and certain heat resistance.

Films and packaging: food‑contact packaging materials taking advantage of favorable film properties.

Other fields: medical devices, pharmaceutical packaging, blow‑molded hollow articles such as containers, fibers and other products.

Performance Parameters

Performance Category	Test Item	Test Standard	Condition / Unit	Value / Range
Basic Properties	Density	ASTM D1505	g/cm³	0.9335‑0.934
	Melt Flow Rate (MFR)	ASTM D1238	190°C / 2.16 kg, g/10min	0.64
Mechanical Properties	Tensile Yield Strength	ASTM D638	kg/cm²	165
	Tensile Strength at Break	ASTM D638	kg/cm²	390
	Elongation at Break	ASTM D638	%	800
	Flexural Strength	ASTM D790	kg/cm²	4600
	Izod Notched Impact Strength (23℃)	ASTM D256	kg·cm/cm	NB (No break)
	Shore Hardness	ASTM D2240	Shore D	53
Long‑term Properties	Environmental Stress‑Cracking Resistance (ESCR) F₅₀	ASTM D1693	hr	＞10 000
Thermal Properties	Vicat Softening Point	ASTM D1525	°C	123‑135
Optical / Film Properties	Film Tensile Strength at Break (MD)	ASTM D882	MPa	38.2
	Film Elongation at Break (MD)	ASTM D882	%	800
	Film Flexural Modulus (MD)	ASTM D790	MPa	451

Molding Process

Processing Stage	Parameters	Recommended Range / Description
Drying	Necessity	PE has extremely low water absorption (<0.01%), pre‑drying is normally unnecessary. Dry at 60‑80°C for 1‑2 hours under extremely humid storage conditions.
Extrusion	Barrel Temperature	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.
Injection Molding	Barrel Temperature	HDPE reference around 220°C; lower value for rear zone, higher value for front zone. Adjust for MDPE according to actual products.
	Mold Temperature	HDPE mold temperature is normally 10‑20°C higher than LDPE (LDPE around 30‑45°C). Recommended:40‑60°C. Higher mold temperature improves crystallinity and strength while increasing shrinkage.
	Injection Pressure	PE has good flowability. Use relatively low pressure 50‑100 MPa except for thin‑wall slender parts; adjust according to product structure.
Cooling	‑	PE cools slowly; sufficient cooling and well‑designed mold cooling system are required. For extruded pipes, sizing cooling water temperature:10‑25°C.

Disclaimer: All above data is for reference only.