MDPE MFI 3713

MDPE MFI 3713 is a medium-density polyethylene (MDPE) grade known for its broad molecular weight distribution and high melt strength. This grade is specially designed for producing thin films with high tear resistance, good sealability, high strength, and high drawdown capabilities

Complete Description of MDPE MFI 3713:

MDPE MFI 3713 is a grade of Medium-Density Polyethylene (MDPE) designed for various industrial applications. It is specifically engineered to offer a balance between the properties of low-density polyethylene (LDPE) and high-density polyethylene (HDPE). MDPE is known for its moderate density structure, providing a unique set of mechanical and thermal properties suitable for demanding applications in packaging, piping, and more. The MFI 3713 designation refers to the Melt Flow Index (MFI) value of the material, which indicates the ease of flow during processing and the material’s viscosity.

The MFI value of 3713 generally implies that this material has a higher flow rate than typical HDPE grades, making it easier to process, especially in extrusion and injection molding. MDPE MFI 3713 is used in applications requiring moderate stiffness, flexibility, and chemical resistance, providing a good balance of strength, durability, and flexibility.

Key Properties:

Density: Approx. 0.926-0.940 g/cm³ (Medium Density)
The density of MDPE is between that of LDPE and HDPE, giving it a good balance of strength and flexibility.
Melt Flow Index (MFI): 3.0 to 5.0 g/10 min (at 190°C, 2.16 kg)
The MFI of 3713 indicates that the polymer has a relatively moderate flow rate compared to higher MFI grades, offering a good combination of processability and mechanical strength.
Tensile Strength: Around 18-25 MPa
Provides moderate strength, suitable for applications that require impact resistance and long-lasting durability.
Elongation at Break: Typically around 400-600%
Shows good elongation properties, which contributes to its flexibility and durability in various applications.
Flexural Modulus: Approx. 500-900 MPa
A medium-level modulus indicates good rigidity without being too brittle, making it ideal for applications that need moderate stiffness and flexibility.
Impact Strength: Good, suitable for high-impact applications. MDPE typically exhibits excellent low-temperature impact resistance.
Softening Point: Around 115-125°C
This is the temperature at which the material begins to soften, which is important for determining the temperature range suitable for processing.
Thermal Stability: Good thermal stability, typically suitable for processing at temperatures ranging from 190°C to 220°C (depending on the processing technique used).
Chemical Resistance: Excellent resistance to acids, alkalis, and alcohols. MDPE also has good resistance to moisture and UV degradation, making it useful for outdoor and harsh environments.

Key Features:

Moderate Flexibility and Stiffness: MDPE MFI 3713 provides an optimal balance between strength, flexibility, and stiffness, making it ideal for applications requiring moderate structural integrity and flexibility.
Good Processability: The MFI value of 3713 allows for easier extrusion, injection molding, and blow molding, making it suitable for high-volume manufacturing processes.
Good Impact Resistance: MDPE MFI 3713 demonstrates good resistance to cracking under impact and is suitable for applications requiring durability under stress.
UV Resistance: Offers better weathering resistance than LDPE, which makes it suitable for outdoor and exterior applications where the material is exposed to sunlight and environmental factors.
Low Gas Permeability: Provides better barrier properties compared to LDPE, which can be advantageous in certain packaging and pipe applications.

Applications:

MDPE MFI 3713 is used in a variety of applications that require a balance of flexibility, strength, and processability. Common applications include:

Piping and Plumbing Systems:
- Used in water and gas piping due to its chemical resistance, impact strength, and ease of processing.
- MDPE pipes are commonly used for natural gas distribution and potable water systems.
Film and Sheet Extrusion:
- MDPE is used in packaging films and laminated sheets.
- It is often used in shrink films, protective films, and heavy-duty bags.
Flexible Tubing:
- Ideal for use in medical tubing, hoses, and coated cables due to its flexibility and low moisture absorption.
Packaging Materials:
- Heavy-duty sacks, shopping bags, and industrial packaging materials.
- Carrier bags and heavy-duty films used in food and retail packaging.
Consumer Goods:
- Used in the production of containers, bottles, caps, and lids for various consumer products.
- Outdoor furniture, storage containers, and other durable consumer goods.
Automotive and Industrial Applications:
- Used in automotive parts, fuel tanks, and industrial containers where durability and chemical resistance are important.
Agricultural Films:
- Used for mulch films and greenhouse films, providing UV resistance and impact resistance.
Electrical Insulation:
- Used in cable jackets and insulation for electrical wiring and cables.

Processing Methods:

MDPE MFI 3713 can be processed by the following methods:

Extrusion:
- Suitable for film extrusion, sheet extrusion, and pipe extrusion. The moderate MFI allows for efficient flow during the extrusion process, making it suitable for high-volume production.
Injection Molding:
- Can be used to produce molded parts that require moderate strength, flexibility, and impact resistance. The MFI value makes it ideal for the production of complex, high-volume molded components.
Blow Molding:
- Widely used for the production of bottles, containers, and hollow parts due to its excellent processability.
Thermoforming:
- Can be used for thermoforming thin-gauge sheets into various packaging products and containers.

Advantages:

Good Balance of Properties: MDPE MFI 3713 offers a balance between the strength of HDPE and the flexibility of LDPE, making it suitable for a wide range of applications.
Ease of Processing: The moderate melt flow index makes it easier to process, reducing energy consumption and improving manufacturing efficiency.
Durability: The material is chemically resistant and performs well in demanding conditions, offering long-term durability.
Cost-Effective: MDPE MFI 3713 is often more cost-effective than higher-density polymers like HDPE, making it a good choice for large-volume production.

Conclusion:

MDPE MFI 3713 is a versatile, high-performance material with a balance of strength, flexibility, and impact resistance. Its good chemical resistance and easy processability make it a popular choice for applications ranging from packaging and piping to automotive and consumer goods. Whether in extrusion, injection molding, or blow molding, this grade of MDPE provides reliable performance, making it ideal for a wide array of industries and applications requiring moderate-density polyethylene.