👉 PEI (Polyetherimide) is a high-performance engineering plastic known for high strength and toughness, low creep, and excellent dimensional stability. They can be used continuously at 170–180°C, with short-term peaks up to 200°C. PEI also offers UL94 V-0 flame retardancy and outstanding electrical insulation.

👉 PEI has slightly lower heat and chemical resistance compared to PEEK but is more cost-effective, with superior dimensional stability and inherent flame retardancy. PEI screws are recommended for electronic modules and structural fixation points operating below 180°C. (** but for long-term >200°C conditions, or exposure to strong acids, bases, or aggressive organic solvents, PEEK screws would be more suitable)

👉 • Severe chemical/temperature conditions (>180–200°C or long-term chemical immersion) → PPS is better.
Typical uses: chemical tank brackets, pump bases, wet process covers.
• Electrical insulation, flame retardancy, low ion release, ≤180°C → PEI is better. Typical uses: ATE/ICT test fixtures, power module backplates, sensor isolation mounts.

👉 They are suitable for continuous use at 170–180°C, with short-term peaks up to 200°C. For sustained use above 200°C, PEEK screws are recommended.

👉 PEI exhibits low creep and a low coefficient of thermal expansion, ensuring threads and clamping force remain stable under long-term loads. Ideal for optical jigs and precision alignment modules.

👉 PEI offers volume resistivity >10^16 Ω·cm and a low dielectric constant, making it suitable for high-voltage power modules, control board standoffs, and connector insulation mounts.

👉 PEI is inherently flame-retardant (UL94 V-0) without additional additives. Commonly used in power modules and industrial control enclosures.

👉 PEI screws perform well in most weak acids, weak bases, and standard cleaning agents. They also maintain thread and dimensional stability under dry-heat conditions ≤180°C.
Additionally, PEI has excellent hydrolysis resistance, making it suitable for steam sterilization environments.

👉 In repeated heating and cooling cycles (low-to-moderate thermal cycling ≤180°C), PEI screws maintain stable dimensions and clamping force. They are ideal for precision electronics and semiconductor equipment with light-load fastening points.
Examples: semiconductor test fixtures, electronic module insulation screws, optical inspection module mounts.

👉 Yes, with low water absorption, PEI screws exhibit minimal dimensional changes, making them suitable for humidity-sensitive test modules and medical instruments.

👉 With hydrolysis resistance, high-temperature tolerance, chemical resistance, and stability under thermal cycling, PEI screws are ideal for light-load fastening in:
• Electronics/Semiconductors: test fixtures, light-load brackets
• Medical/Life Science Equipment: modules requiring steam sterilization or humid-heat stability
• Precision Instruments: optical jigs, microscope module fastening
• Electrical Safety Devices: distribution box insulation screws, relay brackets

👉 PEI offers low thermal expansion, dimensional stability, and chemical resistance. Even under thermal cycling or humid conditions, PEI screws maintain structural integrity, making them well-suited for precision fastening points in optical modules, automation fixtures, and other delicate assemblies.