HDPE BL3 HF4760

What Is HDPE BL3 (HF-4760) and Why Is It a Professional Choice for Blow Molding?

HDPE BL3, known by its industrial designation HF-4760 (BL3), is a specialized grade of high-density polyethylene produced by Jam Petrochemical Company using the Hostalen process (slurry polymerization). This grade is engineered with a bi-modal structure and a 1-butene comonomer to achieve a precise balance between mechanical strength, suitable melt flow, and resistance to environmental stress cracking.

These characteristics make HF-4760 a reliable option for manufacturers who value consistent quality, uniform wall thickness, and long-term durability in blow molding applications.

Key Technical Properties of HDPE BL3

• Density: 0.942 to 0.956 g/cm³
• MFR (190°C / 5 kg): approximately 0.9 to 1.5
• Molecular structure: Bi-modal HDPE
• High stiffness and strength combined with good impact resistance
• Excellent resistance to stress cracking (ESCR)
• Appropriate melt flow for blow molding containers with complex shapes

This combination of properties ensures that the final product is mechanically reliable while exhibiting stable and controllable behavior during processing.

Main Applications of HDPE BL3

HDPE BL3 is specifically designed for blow molding and performs very well in the following applications:

• Production of various plastic containers ranging from a few milliliters up to approximately 10 liters
• Packaging containers for detergents, chemical products, and industrial materials
• Industrial jerry cans and bottles requiring high mechanical strength
• Production of sheets for thermoforming processes

In these applications, uniform wall thickness and high resistance to stress cracking represent the main competitive advantages of this grade.

Additives and Processing Stability

This grade is supplied with the following built-in additives:

• Antioxidants and processing stabilizers
• Lubricants and acid scavengers

This additive package provides good thermal stability during melting and forming, helping to maintain consistent quality throughout the production process.

Recommended Processing Conditions

• Suggested barrel temperature: 190 to 280°C
• Suitable for blow molding extruders with precise temperature control

The shear behavior and viscosity profile of this grade enable the production of containers with appropriate blow ratios and a uniform surface finish.

Safety, Storage, and Packaging

Safety Considerations

• Molten polymer can cause skin or eye injuries; the use of protective gloves and safety goggles is recommended.
• Adequate ventilation is essential when working with molten polymer.
• Accumulation of dust or fine particles may pose an explosion risk; the use of filters and proper grounding systems is required.

Storage Conditions

• Store away from direct sunlight and heat sources.
• Keep in a dry, cool environment, preferably below 50°C.
• Under proper conditions, material properties are maintained for at least 18 months.
• It is recommended to use the material within 6 months after delivery.

Packaging

• Supplied in pellet form in 25 kg bags
• Alternative packaging options may be available for specific orders.

Scientific Explanation of the Bi-modal Structure and the Hostalen Process

From a scientific perspective, the main advantage of HDPE HF-4760 (BL3) lies in its bi-modal molecular weight distribution, which is precisely controlled during the Hostalen process. In this structure, the high-molecular-weight fraction primarily contributes to enhanced mechanical strength, impact resistance, and especially resistance to environmental stress cracking (ESCR), while the lower-molecular-weight fraction improves melt flow and processing stability in blow molding. The coexistence of these two molecular populations creates a balance that, according to well-established rheological mechanisms, enables uniform blowing, controlled wall thickness, and retention of mechanical properties in the final product. In mono-modal grades, achieving such a balance typically requires sacrificing one of these key properties.

Technical Summary of HDPE BL3

HDPE HF-4760 (BL3) is an engineered grade for manufacturers seeking high strength, processing stability, resistance to stress cracking, and consistent final product quality in blow molding applications. The use of the Hostalen process and a bi-modal molecular structure makes this grade a dependable choice for industrial containers and sensitive packaging applications.

If wall quality, product durability, and production consistency are non-negotiable for you, HF-4760 (BL3) is designed precisely for that purpose.