Core and Cavity for Injection Molding
Unlock the secret to flawless injection molding! The little features around the mold that ensure the most perfectly shaped parts...
HDPE Injection Molding Service
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HDPE in Injection Molding
HDPE (High-Density Polyethylene) is a favored material for injection molding due to its superior properties and adaptability. Its high strength-to-density ratio, excellent impact resistance, and chemical resistance make it suitable for various applications.
HDPE is also lightweight, easy to process, and cost-effective, which makes it an ideal choice for manufacturers.
| Price: | $$ | Available PA (Nylon) at RapidDirect: | PA(Nylon) Blue, PA6 (Nylon)+GF15 Black, PA6 (Nylon)+GF30 Black, PA66 (Nylon) Beige(Natural), PA66 (Nylon) Black |
|---|---|
| Lead Time: | < 5 days |
| Wall Thickness: | 1mm |
| Tolerances: | ISO2768-C |
| Max Part Size: | 300 mm x 300 mm x 300 mm |
Plastic HDPE Properties
| Properties | Value |
|---|---|
| Density | 0.941-0.965 g/cm³ |
| Tensile Strength | 26-33 MPa |
| Flexural Strength | 35-50 MPa |
| Impact Strength | High |
| Thermal Conductivity | 0.45-0.52 W/(m·K) |
| Melting Point | 120-130°C |
| Coefficient of Thermal Expansion | 100-220 x 10^-6 /°C |
| Moisture Absorption | Very Low |
| Chemical Resistance | Excellent |
| UV Resistance | Poor without additives |
Pros and Cons of HDPE Injection Molding
HDPE plastic offers many benefits that make it suitable for injection molding. However, there are some of its downsides to consider before choosing it for any project.
Pros
- Excellent impact resistance and chemical resistance.
- Cost-effective and widely available.
- Low moisture absorption and good durability.
Cons
- Poor UV resistance without additives.
- Limited high-temperature performance.
- It can be difficult to achieve a high-quality surface finish.
Applications of Injection Molded LDPE Parts
Injection molded HDPE parts are widely used across various industries, including:
- Automotive: Fuel tanks, seats, and interior components.
- Packaging: Bottles, caps, and containers.
- Consumer Goods: Toys, household items, and sporting goods.
- Industrial: Pipes, fittings, and storage tanks.
FAQs
Key design considerations for HDPE injection molding include maintaining uniform wall thickness to minimize warpage and shrinkage, ensuring adequate draft angles to facilitate easy part ejection, and optimizing gate location to promote uniform filling and reduce stress concentrations. Proper venting is essential to prevent gas traps, and using radii at corners can enhance part strength and reduce stress. Attention to these factors ensures high-quality, defect-free HDPE parts. Additionally, it’s important to consider the environmental exposure of the parts, as HDPE has poor UV resistance without additives.
Achieving a good surface finish on HDPE parts involves optimizing the molding process parameters, including mold temperature, injection speed, and cooling rate. Using a highly polished mold surface can also improve the finish. Additionally, ensuring proper drying of HDPE pellets before molding can prevent moisture-related defects affecting surface quality. Incorporating appropriate mold release agents can aid in achieving a smooth finish. Post-molding processes such as trimming, polishing, or coating may be necessary for applications requiring a superior surface finish.
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