Pure PI: Your High-Performance Engineering Plastics Partner.
Pure Polyimide (Pure PI) is an unfilled, high-performance engineering polymer. This polymer is synthesized through the chemical reaction of diamines and dianhydrides. When manufacturing profiles such as sheets and rods from Pure PI, polyimide resin (mostly in powder form) is typically used. These resins are processed into initial shapes through methods like compression molding or isostatic molding. Subsequently, a critical high-temperature curing or sintering process forms the material's final exceptional physical and thermal properties. This material is widely used in extreme operating conditions due to its excellent high-temperature resistance, high mechanical strength, superior electrical insulation, and dimensional stability.
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Typical Performance Data for Pure Polyimide (Pure PI)
Pure polyimide offers high heat resistance, strong mechanical properties, and excellent chemical and electrical insulation.
|
Property |
Unit |
Typical Value |
Test Standard |
|---|---|---|---|
|
Density |
g/cm³ |
1.40 - 1.45 |
ISO 1183 / ASTM D792 |
|
Water Absorption, 24hr |
% |
< 0.5 |
ISO 62 / ASTM D570 |
|
Property |
Unit |
Typical Value |
Test Standard |
|---|---|---|---|
|
Tensile Strength @ Yield |
MPa |
80 - 120 |
ISO 527 / ASTM D638 |
|
Tensile Modulus |
GPa |
3.0 - 4.0 |
ISO 527 / ASTM D638 |
|
Elongation at Break |
% |
3.0 - 7.0 |
ISO 527 / ASTM D638 |
|
Flexural Strength |
MPa |
130 - 180 |
ISO 178 / ASTM D790 |
|
Flexural Modulus |
GPa |
3.2 - 4.5 |
ISO 178 / ASTM D790 |
|
Izod Notched Impact Strength |
kJ/m² |
3.0 - 6.0 |
ISO 180 / ASTM D256 |
|
Hardness |
Rockwell M / Shore D |
M110-M120 / D85-D90 |
ISO 2039 / ASTM D785/D2240 |
|
Property |
Unit |
Typical Value |
Test Standard |
|---|---|---|---|
|
Continuous Service Temp. |
°C |
> 260 |
- |
|
Heat Deflection Temp. @1.8MPa |
°C |
> 350 |
ISO 75 / ASTM D648 |
|
Thermal Conductivity |
W/(m·K) |
0.2 - 0.4 |
ASTM C177 |
|
Coeff. of Linear Therm. Exp. |
x 10⁻⁶ /°C |
40 - 55 |
ISO 11359 / ASTM E831 |
|
Flammability Rating |
UL94 |
V-0 |
UL 94 |
|
Property |
Unit |
Typical Value |
Test Standard |
|---|---|---|---|
|
Dielectric Strength |
kV/mm |
15 - 25 |
IEC 60243 / ASTM D149 |
|
Volume Resistivity |
Ohm·cm |
> 10¹⁵ |
IEC 60093 / ASTM D257 |
|
Dielectric Constant @ 1MHz |
- |
3.2 - 3.6 |
IEC 60250 / ASTM D150 |
|
Dissipation Factor @ 1MHz |
- |
< 0.005 |
IEC 60250 / ASTM D150 |
Advantages of Pure PI
Pure PI (Pure Polyimide) is a core material for extreme operating conditions. It maintains excellent dimensional stability and mechanical strength at temperatures exceeding 260°C. Its superior electrical insulation (dielectric strength 15-25 kV/mm), combined with chemical and radiation resistance, allows for wide application. Extremely low outgassing in vacuum (TML<1%) ensures its reliability in high-purity applications such as aerospace and semiconductors.
Stable Performance and Dimensions
Pure PI has a continuous service temperature above 260°C and short-term capability beyond that. Its HDT (@1.8MPa) exceeds 350°C, and it has a low CLTE (40-55 x 10⁻⁶ /°C). Combined with high rigidity (Tensile Modulus 3.0-4.0 GPa), it ensures minimal dimensional changes under temperature fluctuations, crucial for precision applications to prevent seizing or accuracy loss.
Good Electrical Insulation
Pure PI offers high dielectric strength (15-25 kV/mm) and volume resistivity (>10¹⁵ Ohm·cm), ensuring excellent insulation and minimal leakage. Its stable dielectric constant (3.2-3.6) and low dissipation factor (<0.005) at 1MHz make it ideal for high-frequency and high-reliability applications like EV insulation, nuclear cables, and coil bobbins.
Chemical and Radiation Resistance
Pure PI resists solvents, oils, fuels, and weak acids, ensuring durability in harsh chemical environments, though strong alkalis may affect it. Its molecular structure provides strong resistance to high-energy radiation, with slower degradation than many polymers, making it ideal for nuclear and military applications requiring long-term reliability.
Low Outgassing
Pure PI has extremely low outgassing, with TML < 1.0% and CVCM < 0.1%, meeting strict HV and UHV standards. This prevents contamination of vacuum systems and sensitive components, making it ideal for semiconductor, aerospace, and scientific equipment in clean or vacuum environments.
Your Trusted Pure PI Precision Machining Partner from China
As a professional manufacturer in the field of high-performance engineering plastics, Dalian Allstar Material Co., Ltd. possesses significant advantages in the precision machining of Pure PI (Pure Polyimide), aiming to provide exceptional value to global customers, including wholesale options.
Integrated Solution
From the supply of Pure PI raw materials (sheets, rods) from our factory to the custom machining of precision components, we offer a complete service chain. Customer procurement processes are simplified, and consistency between material and machining is guaranteed.
Specialized Processing
We have a deep understanding of Pure PI’s unique machining challenges (e.g., material hardness, susceptibility to chipping) and optimized processing techniques. This ensures precise tolerances and high-quality surface finishes, including the exterior of parts.
Advanced Equipment
Our company is equipped with precision CNC machine tools, injection molding machines, lathes, and auxiliary equipment suitable for processing high-performance polymers. This allows us to meet complex geometric shapes and stringent design requirements.
Rigorous Quality Control
Over 20 inspection instruments are used for final inspection. From raw materials to finished products, quality at every stage is strictly controlled to ensure parts meet drawing specifications and performance requirements.
Application Experience
Our experience serving demanding industries such as nuclear power, military, automotive, and electronics has provided us with a profound understanding of Pure PI’s performance and machining considerations in specific applications.
Customization Capability
Whether for small-batch prototype production or large-scale manufacture orders, our flexible production capacity can meet the customized needs of different customers.
Choosing Allstar Material for Pure PI component machining means choosing reliability, precision, and professionalism. We are committed to being your long-term, trustworthy partner in demanding engineering plastics applications. Contact
Applications of Pure PI in Various Industries
Pure PI is widely used in aerospace, electronics, automotive, nuclear, and semiconductor industries for its high heat resistance, electrical insulation, chemical stability, and low outgassing properties, ensuring reliable performance in extreme environments.
Aerospace
Semiconductor Industry
Nuclear Power
Precision Machinery
Electric Vehicles
Vacuum Equipment
Others
Pure Polyimide Resins from Allstar Material
Allstar Material offers a complete range of pure polyimide resins, delivering exceptional performance for advanced engineering applications:
