What is PP Injection Molding?
We specialize in producing high-performance polypropylene components that combine chemical resistance, impact strength, and cost-efficiency. We deliver consistent quality and precision in every pp part, whether it’s a functional prototype or a high-volume production run. With decades of experience in PP plastic molding, we help you make the most of PP’s advantages—lightweight, flexible, and tough—making it ideal for complex geometries, thin-wall parts, and high-volume production. Our in-house capabilities cover everything from mold design and material selection to final part inspection, ensuring smooth production and dependable results. Looking for a dependable partner for custom PP molding? We’re here to deliver solutions tailored to your part design, function, and budget.
Injection Molding PP Parameters Table
| Parameter | Recommended Range |
|---|---|
| Wall Thickness | 0.8mm - 4.5mm |
| Maximum Part Size | 1800mm x 1200mm x 800mm |
| Minimum Feature Size | 0.3mm - 1.08mm |
| Tolerances | ±0.03mm - ±0.15mm |
PP Material Propertie
Polypropylene Injection molding is a versatile thermoplastic process known for its excellent chemical resistance, low density, and flexibility. Its semi-crystalline structure provides durability while maintaining lightweight characteristics, making it ideal for a variety of industries. Key Material Properties:
- Excellent chemical resistance – withstands exposure to acids, bases, and solvents.
- Lightweight & durable – maintains strength while reducing overall weight.
- Good impact resistance – flexible yet tough under mechanical stress.
- Moisture resistance – does not absorb water, ensuring stability in humid environments.
| Property | Density | Tensile Strength | Flexural Strength | Impact Strength (Unnotched) | Heat Deflection Temp (0.45 MPa) |
|---|---|---|---|---|---|
| Value/Description | 0.89 - 0.91g/cm³ | 25 - 40 MPa | 30 - 55 MPa | 2 - 10 kJ/m² | 80 - 110℃ |
- The above parameters represent the baseline performance of the materials. Actual application should be dynamically optimized based on specific working conditions.
Advantages & Disadvantages of PP Injection Moulding
Advantages
- Low cost & high efficiency
- Excellent chemical resistance
- Flexible & impact-resistant
- Moisture & corrosion resistance
Disadvantages
- Lower heat resistance
- Limited UV resistance
- Lower stiffness compared to engineering plastics
Applications of Polypropylene Injection Molding
Injection moulding PP is widely used across industries due to its durability, flexibility, and chemical resistance. Our custom injection molding service, backed by expertise in polypropylene molding, ensures high-quality, cost-effective solutions for various applications.
Automotive Industry
- Interior trim panels
- Battery casings
- Fluid reservoirs
- Bumper reinforcements
Packaging Industry
- Food containers
- Caps and closures
- Cosmetic packaging
- Pharmaceutical bottles
Consumer Goods
- Household storage containers
- Toys and baby products
- Reusable water bottles
- Garden equipment
Medical Devices
- Disposable syringes
- Medical tubing
- Pill dispensers
- Sterile packaging
Jiangzhi PP Injection Molding Parts are Guaranteed
100% satisfaction: Precision-engineered PP injection moulding components with superior flexibility, chemical resistance, and durability – your vision, perfected in Polypropylene.
Jiangzhi Other Processing Services
- PP Homopolymer: High stiffness, good tensile strength, best for rigid applications (e.g., containers, automotive parts).
- PP Copolymer: Better impact resistance, flexibility, and cold temperature performance, commonly used in medical and packaging applications.
- Filled PP (e.g., glass-filled, talc-filled): Increased stiffness and strength, used in high-performance applications.
- High shrinkage rate – PP shrinks significantly when cooling, which can affect dimensional accuracy.
- Warping and deformation – Uneven cooling can cause parts to warp or distort.
- Weld lines – Visible weld lines may appear where molten flows meet inside the mold, affecting strength.
- Poor adhesion – PP has low surface energy, making it difficult to bond with adhesives or coatings.
- Sensitivity to oxidation – PP degrades under prolonged exposure to UV and high temperatures.
- Melt temperature: Typically between 220°C and 280°C (avoid exceeding 280°C to prevent degradation).
- Mold temperature: Ranges from 20°C to 80°C, with 50°C being the most common setting.
- Injection pressure: Usually 50 MPa to 150 MPa to ensure complete mold filling.
- Cooling time: Varies based on part thickness, typically between 10 and 60 seconds.
Yes, recycled PP can be used, but:
- It may have lower mechanical properties compared to virgin PP.
- It may require additives to improve strength and processability.
- Contamination and degradation must be controlled to ensure consistent quality.
