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...
PBT Injection Molding Service
Get durable, heat-resistant PBT parts with RapidDirect. Reliable quality, fast delivery, and cost-saving solutions.
PBT in Injection Molding
Polybutylene Terephthalate (PBT) is a versatile, high-performance engineering thermoplastic known for its excellent mechanical properties, chemical resistance, and dimensional stability.
It is widely used in various industries, including automotive, electrical, and consumer goods. At RapidDirect, we offer PBT in Black and Milky White (Natural), ensuring high-quality, consistent material for your injection molding needs.
| Price: | $$ | Available PBT at RapidDirect: | PBT Black, PBT Milky White（Natural） |
|---|---|
| Lead Time: | < 5 days |
| Wall Thickness: | 1mm |
| Tolerances: | ISO2768-C |
| Max Part Size: | 300 mm x 300 mm x 300 mm |
Plastic PBT Properties
| Properties | Value |
|---|---|
| Density | 1.31-1.37 g/cm³ |
| Tensile Strength | 50-80 MPa |
| Flexural Strength | 80-140 MPa |
| Impact Strength | Moderate to High |
| Thermal Conductivity | 0.23-0.29 W/(m·K) |
| Melting Point | 225-260°C |
| Coefficient of Thermal Expansion | 40-70 x 10^-6 /°C |
| Moisture Absorption | Low |
| Chemical Resistance | Excellent |
| UV Resistance | Good |
Pros and Cons of PBT Injection Molding
PTFE 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 mechanical properties, including high strength and stiffness.
- Superior dimensional stability and low moisture absorption.
- High resistance to chemicals and heat.
- Good electrical insulation properties.
Cons
- Higher cost compared to some commodity plastics.
- Sensitive to hydrolysis, requiring proper drying before processing.
- Limited impact resistance at low temperatures.
Applications of Injection Molded PBT Parts
Injection molded PBT parts are widely used across various industries, including:
- Automotive: Connectors, sensors, and housings.
- Electrical and Electronics: Switches, relays, and circuit breakers.
- Consumer Goods: Appliance components, handles, and structural parts.
- Industrial: Gears, bearings, and mechanical parts.
FAQs
Typical processing parameters for PBT injection molding include a melt temperature range of 225-275°C and a mold temperature range of 80-120°C. Injection pressure typically falls between 70-140 MPa, depending on part complexity and flow characteristics of the PBT material. Cooling time varies based on part thickness and geometry but generally ranges from 20 to 60 seconds. Pre-drying the material at 1200C for 4 hours is crucial to prevent hydrolysis and maintain mechanical properties.
Common defects in PBT injection molded parts include warpage, voids, and surface blemishes. To minimize these issues, ensure proper mold design with adequate venting and cooling channels. Control processing parameters such as melt temperature, injection speed, and pressure to avoid excessive stress and ensure uniform material flow. Pre-drying the PBT pellets is essential to prevent moisture-related defects. Additionally, optimizing the gate design and placement helps reduce the risk of weld lines and other surface imperfections.
PBT is moderately priced, making it more expensive than commodity plastics like polyethylene and polypropylene but cheaper than high-performance engineering plastics such as PEEK. PBT’s availability is generally good, with various grades and formulations offered by multiple suppliers. Its cost-effectiveness, combined with excellent mechanical properties and chemical resistance, makes PBT a popular choice for applications requiring a balance between performance and price.
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