MDPE resin combines the flexibility of polyethylene with sufficient stiffness and resistance to environmental stress cracking, making it suitable for pressure pipe, cable sheathing, film, blow molding, and other applications. Nianjing supplies MDPE grades based on material, brand, grade, and quantity requirements.
MDPE (Medium Density Polyethylene) is a polyethylene material with a density between typical LDPE and HDPE grades. It is commonly produced by copolymerizing ethylene with alpha-olefins such as 1-butene or 1-hexene. Depending on the polymer structure and grade formulation, MDPE can provide a useful balance of flexibility, stiffness, impact resistance, and environmental stress crack resistance.
Compared with LDPE, MDPE generally offers higher stiffness and strength. Compared with HDPE, it can provide greater flexibility and resistance to certain forms of stress cracking. These characteristics make different MDPE grades suitable for applications where both mechanical performance and material flexibility are required.
The actual properties of MDPE vary by grade and manufacturer. Typical reference values may include:
| Property | Typical Reference Range |
| Density | 0.926–0.953 g/cm³ |
| Melting Temperature | 126–135°C |
| Tensile Strength | 8–24 MPa |
| Melt Flow Rate (MFR) | 0.1–35 g/10 min |
| Environmental Stress Crack Resistance | Grade dependent |
| Long-Term Hydrostatic Strength | Grade dependent |
MDPE is not a single-purpose material. Its properties can be adjusted through polymerization conditions, comonomer selection, molecular weight distribution, and additive systems, resulting in grades designed for different processing methods and end uses.
Pipe-grade MDPE is primarily used for pressure applications such as gas distribution and water systems. These grades are selected according to requirements for long-term hydrostatic performance, slow crack growth resistance, flexibility, and applicable pipe standards.
Film-grade MDPE can be processed by blown-film extrusion for applications such as packaging and industrial films. Depending on the grade, manufacturers may focus on melt strength, film bubble stability, tensile properties, puncture resistance, and processing behavior.
Some MDPE grades are formulated for injection molding, blow molding, or rotational molding. These materials can be used for containers, industrial components, tanks, and other molded products where impact performance and processability are important.
MDPE can also be used as an outer protective layer for communication and power cables. Appropriate grades provide electrical insulation together with resistance to mechanical stress and environmental cracking.
The appropriate MDPE grade depends on the processing method, required mechanical properties, and applicable product standards.
Pipe-grade MDPE is used in pressure piping systems, particularly gas distribution and water supply applications. Its combination of flexibility, crack resistance, and long-term strength can be useful where pipes may experience ground movement or installation-related stress.
MDPE is used for the outer sheath of communication cables, optical cables, and certain power cables. The material provides a protective layer around the internal conductors or fibers while maintaining the flexibility required during installation.
Selected MDPE film grades are used for heavy-duty packaging and industrial films where toughness and resistance to mechanical damage are required.
Certain grades can be processed by rotational molding to produce larger hollow products such as storage tanks and containers. Grade selection depends on impact requirements, wall thickness, processing conditions, and outdoor exposure.
MDPE-based materials may be used in selected geomembrane applications, including liners for waste management and mining-related projects. The suitable formulation depends on the required chemical resistance, mechanical properties, thickness, and environmental conditions.
Nianjing works with plastic raw material supply channels covering different manufacturers and grades. The following materials are representative examples rather than a fixed inventory list.
| Manufacturer / Brand | Grade | Typical Application | Material Characteristics |
| Dow | DOWLEX™ 2344E | Pipe | Ethylene-octene copolymer designed for pipe applications |
| Dow | DMDA-8962 NT 7 | Injection Molding | Grade designed for molded applications with a balance of flow and mechanical properties |
| Dow | DPDA-3135 NT 7 | Rotational Molding | Designed for rotational molding applications requiring impact performance |
| Borealis | Borstar® FB1350 | Film | Film grade based on Borealis polymer technology |
| TotalEnergies | MDPE 3802 | Blow Molding / Cable Sheathing | MDPE grade used in selected molding and cable applications |
| Qatar Chemical | HHM 3802 | Pipe | MDPE pipe grade |
| LyondellBasell | 3321C / 3721C | Film | Film grades used for specific extrusion applications |
| Chevron Phillips Chemical | HHM TR-418Q | Pipe | MDPE pipe grade |
| Chevron Phillips Chemical | HMN TR-938 | Injection Molding | Grade intended for injection molding |
| SK | RG306 / DX800 | Pipe | Pipe-grade MDPE materials |
| Korea Daelim | XP9000 | Pipe | Pipe-grade material |
| Sinopec Zhongyuan Petrochemical | DGDA-2401 | Pipe | Domestic MDPE pipe grade |
Grade availability, packaging, and supply conditions are subject to current market and inventory conditions. The required manufacturer, grade, quantity, and packaging can be provided for a specific supply check.
Choosing an MDPE grade should start with the intended application rather than the material name alone. A pipe manufacturer, film converter, cable producer, and rotational molding company may require substantially different material characteristics.
For procurement, the following information is useful:
| Requirement | Information to Confirm |
| Application | Pipe, film, cable sheath, molding, tank, etc. |
| Processing Method | Extrusion, blown film, injection molding, rotational molding, etc. |
| Grade | Required grade number, if known |
| Brand | Preferred manufacturer, if applicable |
| MFR | Required processing range |
| Density | Required material density |
| Mechanical Properties | Tensile, impact, elongation, etc. |
| Certification | Applicable pipe, drinking water, cable, or other standards |
| Quantity | Required purchasing volume |
| Packaging | Original packaging or other agreed requirement |
For a known material grade, providing the brand, grade, and quantity allows availability and supply conditions to be checked more directly. If the grade has not yet been selected, the application, processing method, and required properties can be used as the basis for sourcing.
MDPE grades can differ significantly in molecular structure, melt flow rate, additives, processing behavior, and applicable certifications, even though they are classified under the same material family.
When selecting an MDPE grade, it is important to consider the intended application and processing method together with the required material properties. The manufacturer's technical data sheet and applicable standards should also be checked before the material is selected.
Nianjing can check sourcing options based on the available requirements, including:
Material → Brand → Grade → Quantity → Application → Delivery Requirement
If the required grade is not listed in the regular product range, the specific material or technical specification can be provided for further sourcing confirmation.
For plastic resin orders, packaging and loading arrangements depend on the material, quantity, available supply, and agreed shipping requirements. Product packaging, quantity, and delivery conditions can be confirmed before shipment.
Show actual MDPE or other plastic resin inventory, warehouse storage, or palletized material.
Show original resin bags, pallet packing, labeling, or prepared shipment.
Show pallet loading, container loading, truck transportation, or other actual delivery arrangements.
MDPE is used in applications including gas and water pipes, cable sheathing, industrial films, molded containers, rotationally molded products, and certain geomembrane applications. The suitable application depends on the properties and certification of the individual grade.
MDPE generally provides a balance between stiffness and flexibility. Some MDPE grades offer higher flexibility and environmental stress crack resistance than comparable HDPE grades, while HDPE is often selected when greater stiffness is required. The actual difference depends on the specific grades being compared.
Yes. Certain MDPE grades are designed for gas distribution pipes and are selected for their flexibility, crack resistance, and long-term pressure performance. The applicable pipe standard and certification should be confirmed for the specific grade and destination market.
Certain MDPE pipe grades are suitable for potable water applications when they meet the relevant drinking-water contact requirements. Certification and regulatory compliance should be checked for the specific grade and intended market.
Yes. Some MDPE grades are formulated for injection molding and can be used for containers, industrial components, and other molded products. Grade selection depends on melt flow, impact requirements, part design, and processing conditions.
For a specified grade, the brand, grade, quantity, and packaging requirement can be provided for an initial supply check. When the grade has not yet been determined, information about the application, processing method, required properties, and applicable standards can help identify suitable sourcing options.
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Please include the material name, manufacturer or brand, grade, quantity, application and delivery requirements when available. If you are unsure about the grade, simply describe your application and requirements.
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