PBT Injection Molding
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PBT resin exhibits outstanding processability, with its ability to flow smoothly during manufacturing processes. It also features remarkable electrical properties, such as high insulation capabilities.
Moreover, PBT resin is renowned for delivering a good surface finish quality, resulting in products with a smooth and appealing appearance.
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What is PBT Plastics?
PBT plastic materials are thermoplastic polyesters with excellent mechanical, thermal, and electrical properties, known for good processability and used in a wide range of applications such as electrical components, automotive parts, and consumer goods.
Description
Full Name
Polybutylene terephthalate
Process
Finishing options
Mold texturing，Electroplating, Bead Blasting
Applications
Household Goods, Outdoor Applications, Electronic appliances, industrial machinery
Prices
$
Features
Appearance
White, Natural color
Strengths
Electrical insulation, High heat resistance, High toughness, and fatigue resistance
Tensile Strength
5800 – 6090 psi
Elongation at Break
30 – 54%
Density
1.34 -1.63 g/㎤
Advantages of PBT Injection Molding
High Strength and Stiffness
PBT has a high tensile strength and modulus of elasticity. This allows it to produce parts that can withstand heavy loads and maintain their shape.
Good Impact Resistance
PBT shows good impact resistance, allowing molded parts to better handle sudden impacts.
Excellent Insulation
PBT, with a dielectric strength of 23 – 24 kV/mm, is a great insulator. It prevents electrical short – circuits, ensuring safe and reliable operation of electrical devices.
High - Temperature Resistance
PBT has a relatively high melting point (around 225 – 235°C) and heat deflection temperature (usually around 150 – 200°C, depending on the load).
Dimensional Stability
During injection molding’s cooling phase, PBT has a low shrinkage rate, yielding parts with accurate dimensions and minimal warping.
Applications of PBT Injection Molding
PBT Injection Molding Material Properties
PBT Plastic Properties
Value
Tensile Strength (Yield) （MPa）
30.0 - 118.0
Flexural Modulus（GPa）
0.231 - 18.1
Impact Resistance (Izod Impact, Notched)
18.7 J/cm (0.712 - 19.3 ft-lb/in)
Maximum Service Temperature（℃）
110
Chemical Formula
(C12H12O4)n
Glass Transition Temperature（℃）
37–52
Heat Deflection Temperature（℃）
150
Drying Temperature（℃）
110～120
Drying Time（hr）
2～3
Mold Temperature（℃）
50～75
Melt Temperature（℃）
250～270
Injection Pressure（MPa）
100～140
Injection Speed（ mm/sec）
High
Cooling Time（S）
15～60
Scrap Quantity（mm）
2～6
Back Pressure（MPa）
5～10
Clamping Force（ton/in2）
3～4
Return Speed (rpm)
70～90
Shrinkage
0.5% and 2.2%
PBT Injection Molding Design Guide
Polybutylene terephthalate (PBT) is a popular thermoplastic polymer used in injection molding. Here are the key design guidelines for PBT injection molding:
Wall Thickness
The recommended wall thickness for PBT is typically between 1 – 3mm. Thinner walls can lead to insufficient strength, while thicker walls may result in longer cycle times and potential internal stresses.
When a change in wall thickness is necessary, use gradual transitions. For example, a taper or a fillet can be used to smoothly connect different – thickness regions. A fillet radius of at least 0.5mm is often recommended to reduce stress concentrations.
Draft Angle
Adequate draft angles are essential for easy part ejection from the mold. For PBT, a minimum draft angle of 1 – 2° for external surfaces and 0.5 – 1° for internal surfaces is generally recommended. This helps to prevent the part from sticking to the mold cavity or core.
Radii
Radii
Gate Location
Gate Type
Part Tolerance
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