PP Impact Copolymer
PP impact copolymer is a type of polypropylene (PP) that has been modified to improve its impact resistance. Polypropylene is copolymerized with another monomer, typically ethylene, resulting in a material with a two-phase structure. This structure consists of:
- Polypropylene matrix, which provides stiffness and strength.
- Dispersed rubbery phase, often made of ethylene-propylene rubber (EPR), which enhances the material’s ability to absorb energy and resist breaking under mechanical stress or impact.
This combination makes PP impact copolymers tougher and less brittle than standard homopolymer polypropylene, especially at low temperatures. They are commonly used in applications requiring durability, such as automotive bumpers, luggage, and other consumer goods that need to withstand impacts without cracking. In essence, a PP impact copolymer is a specialized polypropylene designed for high impact strength and versatility.
supply Various Grades of PP Impact Copolymer pellets
| Grade No. | Manufactuer | MFI | Properties | Application |
| BJ368MO | Borouge | 70 | DOWNLOAD | Articles for daily use |
| BD265MO | Borouge | 7 | DOWNLOAD | |
| BD950MO | Borouge | 7 | DOWNLOAD | Packaging tools, containers |
| BH975MO | Borouge | 38 | DOWNLOAD | Shells, cups, shield |
| BF970MO | Borouge | 20 | DOWNLOAD | Sealed appliances, toys |
| JM-350 | LOTTE | 10 | DOWNLOAD | Toys, containers, sporting goods |
| BE961MO | Borouge | 12 | DOWNLOAD | Furniture, daily supplies |
| 36MK10 | Sabic | 5.5 | DOWNLOAD | Household supplies, packaging, shield |
| RP2400 | Yuhwa | 0.25 | DOWNLOAD | Pallets, buckets |
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PP impact FAQs
What are the key mechanical properties of PP Impact Copolymer
The mechanical properties of PP Impact Copolymer vary depending on its formulation, but typical values are:
Density: ~0.90 – 0.91 g/cm³
Melt Flow Index (MFI, 230°C/2.16kg): 2 – 50 g/10 min (varies by grade)
Tensile Strength at Yield: 20 – 30 MPa
Flexural Modulus: 800 – 1500 MPa
Izod Impact Strength (Notched, 23°C): 20 – 80 kJ/m²
Izod Impact Strength (Notched, -20°C): 5 – 30 kJ/m²
These values make PP-IC suitable for impact-resistant applications like automotive bumpers, battery cases, and industrial storage containers.
What are the main processing methods for PP Impact Copolymer
PP-IC is highly versatile and can be processed using:
Injection Molding: Used for automotive parts, containers, household goods.
Extrusion: Used for pipes, sheets, and profiles.
Thermoforming: Used for food containers and packaging applications.
Blow Molding: Used for bottles and hollow containers.
Processing parameters depend on grade and MFI, with typical injection molding temperatures ranging from 190°C to 240°C.
How does PP Impact Copolymer perform under extreme temperatures
PP-IC has better low-temperature toughness than PP Homopolymer due to its rubber phase. However, its heat resistance is slightly lower, with:
Service Temperature Range: -30°C to 100°C
Vicat Softening Temperature: 125 – 150°C
Heat Deflection Temperature (HDT, 0.45 MPa): 70 – 95°C
For applications exposed to continuous high temperatures (>100°C), PP Homopolymer or other engineered plastics (like PBT or PA) may be more suitable.
What are the chemical resistance properties of PP Impact Copolymer
PP-IC exhibits excellent resistance to a wide range of chemicals, including:
Acids & Bases: Resistant to dilute and concentrated acids/bases.
Solvents: Good resistance to alcohols and hydrocarbons but swells in chlorinated solvents and aromatic hydrocarbons.
Water & Moisture: Virtually no water absorption (<0.03%), ensuring long-term stability.
UV Resistance: Requires additives (UV stabilizers) for prolonged outdoor use.
This makes it ideal for chemical containers, automotive fuel tanks, and industrial storage applications.
What Are the Common Grades of PP Impact Copolymer
Polypropylene Impact Copolymer (PP-IC) grades vary based on properties like impact strength, stiffness, and flowability, which are often measured by the Melt Flow Index (MFI)—an indicator of how easily the material flows during processing. Some common types include:
- High Impact Grades (Low MFI, High Toughness): These offer excellent durability and resistance to impact, making them ideal for applications like automotive bumpers and industrial storage bins.
- Balanced Grades (Moderate MFI, Moderate Impact and Stiffness): These provide a compromise between toughness and rigidity, suitable for rigid packaging and battery cases.
- High Flow Grades (High MFI, Lower Toughness): Designed for faster processing and thinner parts, these are commonly used in thin-walled packaging and fast-cycle injection molding.
Selecting the right grade depends on your processing method and application requirements.
What is the difference between PP Impact Copolymer and PP Homopolymer
PP Impact Copolymer (PP-IC) differs from PP Homopolymer in impact resistance and flexibility. While PP Homopolymer has higher rigidity and better heat resistance, PP-IC contains an ethylene-propylene rubber (EPR) phase, which improves impact strength, particularly at sub-zero temperatures (e.g., -20°C to -30°C). This makes PP-IC preferable for applications requiring toughness and durability.
Polypropylene homopolymer combines low impact strength with moderate flexibility and high stiffness. It offers relatively good transparency and a higher melt flow index, making it easy to process. Typical applications include rigid packaging and textile fibers.
By contrast, PP impact copolymer exhibits high impact strength—especially at low temperatures—thanks to its rubbery phase, which also imparts greater flexibility. Its stiffness is moderate, transparency is lower (more opaque), and melt flow index is reduced. This grade is commonly used for automotive components, piping systems and other durable containers.