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PEI Sheet High Temperature And Hydrolysis Resistant
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Basic Info
| Model No. | AHD-PEI SHEET |
|---|---|
| Brand Name | AHD |
| place of origin | China |
| Processing Service | Cutting, Moulding |
| Thick (mm) | 5--80 |
| Size (mm) | 610*1220 |
| Color | Amber |
Product description
PEI (polyetherimide) is a high-performance specialty engineering plastic and a semi-crystalline derivative of polyimide (PI). Its molecular structure contains ether bonds (-O-) and imine rings (-CO-N-CO-), giving it excellent overall performance, particularly in applications requiring high temperatures, high strength, and chemical resistance.
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Core Properties of?PEI SHEET
PEI's performance is determined by its molecular structure, encompassing multiple dimensions including thermal, mechanical, chemical, and electrical properties. These properties are as follows:
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1. Excellent Heat Resistance
Glass transition temperature (Tg): Approximately 217°C (semi-crystalline state), with the amorphous state boasting a higher Tg (>250°C).
Heat deflection temperature (HDT): Unreinforced grades have an HDT of approximately 200°C, while glass fiber-reinforced grades (PEI GF)can reach over 260°C.
Long-term operating temperature: -50°C to +180°C (unreinforced), with short-term temperature resistance up to 200°C (amorphous state).
Low-temperature resistance: Maintains excellent toughness at -50°C, with no brittle cracking.
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2. Excellent Mechanical Properties
Strength and Modulus: Unreinforced grades offer a tensile strength of approximately 90-110 MPa, a flexural strength of 150-180 MPa, and a flexural modulus of 3.6-4.0 GPa. Glass fiber reinforcement (pei glass fiber) increases the tensile strength to 180-220 MPa and the modulus to 10-12 GPa.
Fatigue Resistance: Stable performance under cyclic loading, with high fatigue strength retention.
Impact Resistance: Notched impact strength is approximately 5-10 kJ/m2 (unreinforced), which can be further improved with glass or carbon fiber reinforcement.
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3. Excellent Chemical and Radiation Resistance
Chemical Corrosion Resistance: It is virtually insoluble in common organic solvents, except for strong oxidizing acids such as concentrated sulfuric acid and nitric acid, and exhibits excellent hydrolysis resistance.
Radiation Resistance: It exhibits strong resistance to gamma rays, X-rays, and UV rays, making it suitable for use in nuclear and space environments.
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4. Self-lubrication and Wear Resistance
PEI has low surface energy and a certain degree of self-lubrication. Its wear resistance surpasses that of most engineering plastics, making it a suitable alternative to traditional metal bearings or gears.
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5. Flame Retardancy and Safety
It achieves UL94 V-0 rating without the addition of flame retardants, emits extremely low smoke during combustion, and meets low-smoke requirements in aviation, medical, and other fields.
It is non-toxic and food contact-safe, making it suitable for medical devices and food processing equipment.
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6. Electrical Insulation and High-Frequency Performance
With a volume resistivity greater than 101? Ω·cm, a surface resistivity greater than 101? Ω, a dielectric constant (at 1MHz) of approximately 3.1, and a dielectric loss tangent (at 1MHz) of approximately 0.001, it is an excellent insulating material.
In high-frequency applications (such as 5G millimeter waves and radar), its dielectric properties are stable, making it suitable for high-frequency circuit board substrates or radomes.
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7. Dimensional Stability
It has low hygroscopicity and requires only brief drying (80-100°C, 2-4 hours) before processing. Dimensional change after molding is minimal, making it suitable for high-precision parts.
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PEI's Core Advantages
Compared to other engineering plastics or metals, PEI's advantages lie in the following:
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1. Unique Combination of "High-Temperature + High-Strength"
PEI maintains high strength at 200°C, while most engineering plastics experience a significant drop in strength above 120°C. Compared to aluminum alloys, PEI's density is only one-third that of aluminum, yet its strength-to-density ratio (strength/density) approaches or even exceeds that of some aluminum alloys.
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2. Dual Resistance to Chemical Corrosion and Radiation
PEI is stable to most chemical media and exhibits radiation resistance far exceeding that of ordinary plastics, making it suitable for harsh environments.
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3. Low Moisture Absorption and Dimensional Stability
PEI has a moisture absorption rate of only 0.25%, resulting in minimal dimensional change after molding, making it suitable for high-precision assembly.
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4. Comprehensive Flame Retardancy and Safety
It achieves UL94 V-0 rating without the need for flame retardants and generates extremely low smoke, meeting the stringent requirements of medical and aviation applications.
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5. Versatile and Expandable
Performance can be further optimized through modification (such as glass fiber/carbon fiber reinforcement, flame retardants, and UV stabilizers), adapting to diverse applications (e.g., reinforced grades for increased strength, flame-retardant grades for electronic devices).
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Besides, we offer PEI ROD, too. Contract us for more information or click below.
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Amber PEI sheet
Amber PEI sheet
Amber PEI sheet
PEI Sheet High Temperature And Hydrolysis Resistant
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