PEEK in Autonomous Driving and Intelligent Vehicles: From LiDAR to High-Voltage Connectors

Introduction: The Materials Revolution of the Intelligent Vehicle Era

In 2026, China’s new energy vehicle market continues to lead the world. L2+ assisted driving penetration has surpassed 60%, urban NOA (Navigation on Autopilot) is spreading rapidly, and L3/L4 autonomous driving commercial demonstration programs are fully underway in Beijing, Shanghai, Guangzhou, and other major cities. At the same time, vehicle computing platform power consumption has leaped from tens of watts to hundreds of watts, and high-voltage electrical systems, dense sensor arrays, and complex wiring harnesses are placing unprecedented demands on component materials.

PEEK (Polyether Ether Ketone) — often called “the gold standard of engineering plastics” — is playing an increasingly vital role across the intelligent vehicle supply chain, thanks to its outstanding thermal resistance, chemical resistance, mechanical strength, and electrical insulation properties.

I. LiDAR: PEEK’s Precision Packaging Stage

LiDAR is the “eyes” of L3+ autonomous driving. Mainstream solid-state and hybrid solid-state LiDAR systems operate across a wide temperature range (-40°C to +85°C), with internal optical components that are exquisitely sensitive to vibration and deformation, all while facing exposure to rain, dust, and chemical cleaning agents.

Key PEEK Applications in LiDAR

Component	PEEK Advantage
Optical lens mounts and positioning frames	Ultra-low coefficient of thermal expansion (CTE) ensures laser alignment accuracy doesn’t drift under temperature changes
Rotating bearing cages	Wear-resistant, self-lubricating; replaces metal for >30% weight reduction
Housing sealing structures	UV-resistant, ozone-resistant; no degradation from long-term outdoor exposure
Internal insulating spacers	UL 94 V-0 flame rating; effectively prevents short circuits between driver circuits

Leading domestic LiDAR companies including RoboSense, Huawei LiDAR, and Hesai have adopted PEEK and carbon fiber-reinforced PEEK (CF-PEEK) in bulk for critical precision structural components. The mass production scale-up of solid-state LiDAR will further drive demand in this segment.

II. High-Voltage Connectors and Wiring Harness Insulation: The 800V Platform’s Materials Challenge

As 800V high-voltage fast-charging platforms become standard on flagship vehicles, onboard high-voltage wiring harness rated voltages have risen from 400V to 800V and even 1000V, with peak currents exceeding 500A. Conventional PA66 and PBT connector materials face risks of insufficient heat resistance and creep deformation under these conditions.

Why 800V Systems Need PEEK

Temperature rating: PEEK’s continuous service temperature reaches 260°C, far exceeding PA66’s 120°C limit — suitable for high thermal density environments like motor controllers and OBCs (on-board chargers)
Dielectric strength: Breakdown voltage >20 kV/mm, providing sufficient insulation safety margin for 800V systems
Dimensional stability: Water absorption <0.1%, ensuring connector insertion/withdrawal force remains consistent in high-humidity environments
Flame resistance: LOI (Limiting Oxygen Index) >35%; achieves UL V-0 without halogen additives

Leading automotive electrical suppliers such as Aptiv and Yazaki have already adopted injection-molded PEEK extensively in high-voltage DC connector insulators and seal support structures.

III. ADAS Sensor Modules: Millimeter-Wave Radar and Cameras

Millimeter-Wave Radar Radomes

The radome material for 77GHz millimeter-wave radar must exhibit extremely low dielectric constant (Dk) and loss tangent (Df) to minimize signal attenuation. Pure PEEK has a Dk of approximately 3.2 and a Df of only 0.002, making it an ideal radome candidate. Compared to ABS or PC, PEEK radomes deform minimally at high temperatures (such as summer sun exposure on a vehicle’s front end), maintaining more stable radar detection accuracy.

Camera Module Structural Components

Front-view, side-view, and rear-view camera module lens holders and PCB mounting brackets must maintain micron-level dimensional accuracy across a wide temperature range of -40°C to +105°C. PEEK’s glass transition temperature (Tg) reaches 143°C, meaning it remains fully in the rigid glassy state across this entire operating range — no creep occurs, and optical axis stability is guaranteed.

IV. Braking and Steering Systems: The Ultimate Test for Safety-Critical Parts

In electric power steering (EPS) systems and brake-by-wire systems, gearbox worm gears, bushings, and sensor brackets must withstand high-cycle fatigue loading while being immersed in lubricating grease. Wear-grade modified PEEK (with PTFE, graphite, or carbon fiber additions) delivers:

Friction coefficient <0.15 (dry), a 70% reduction versus steel-on-steel
PV value (pressure × velocity) >0.3 MPa·m/s, meeting long-life operating requirements
Resistance to ATF/DOT4 brake fluid — no swelling, no corrosion

V. Autonomous Driving Computing Platforms: PEEK Insulating Thermally Conductive Composites

L4 autonomous driving domain controllers (e.g., Orin-X chip platforms) have per-chip TDP of up to 100W, with total domain controller power consumption exceeding 500W. Liquid cooling system seals and insulating thermal pads must simultaneously meet:

High thermal conductivity: ≥1 W/(m·K) (achieved through boron nitride filler modification)
High electrical insulation: CTI ≥600V, preventing leakage between coolant channels and circuit boards
Ethylene glycol coolant resistance: No swelling after prolonged immersion

Thermally conductive insulating PEEK composites are emerging as a new solution for this application, offering 40% weight savings versus ceramic insulating sheets with greater design freedom.

VI. Market Outlook: Intelligent Vehicles Driving PEEK Demand Growth

Industry estimates suggest that a vehicle equipped with full L3 autonomous driving hardware uses approximately 1.5–3 kg of PEEK (including connector insulators, sensor structural components, and wiring harness sealing assemblies) — a 7–15× increase compared to the roughly 0.2 kg used in a conventional combustion engine vehicle.

As domestic L2+ penetration continues to rise in 2026 and L3 commercial deployment accelerates:

China’s automotive PEEK market is projected to grow at 18–22% CAGR from 2026 to 2030
High-voltage connector insulators are currently the largest single-application segment, accounting for approximately 35% of automotive PEEK consumption
LiDAR structural components and domain controller thermal management will be the fastest-growing emerging applications

VII. YFT Tech’s PEEK Solutions for Intelligent Vehicles

YFT Tech focuses on precision processing and solution provision for high-performance PEEK materials, serving intelligent vehicle component customers with:

Injection-grade PEEK pellets: For precision injection molding of high-voltage connectors and sensor structures
CF-PEEK composite rods/sheets: Carbon fiber-reinforced, high rigidity and low density, ideal for LiDAR structural frames
Wear-grade modified PEEK: PTFE/graphite-filled, designed for friction pairs in EPS gearboxes and bushings
CNC precision machined parts: From prototype samples to production quantities, tolerances to ±0.01mm

We understand the automotive industry’s stringent requirements for material certification (IATF 16949), traceability, and supply chain stability. OEMs and Tier 1 suppliers are welcome to contact us to discuss technical collaboration and sample evaluation.

Conclusion

Autonomous driving is not just a competition in software and algorithms — it is equally a competition in materials science and precision manufacturing. With its “one material, multiple capabilities” performance profile, PEEK has secured an irreplaceable position across the core functional domains of intelligent vehicles: sensing, connectivity, computing, and actuation. Seizing this opportunity represents a historic moment for the high-performance engineering plastics industry in the new energy vehicle era.

For more technical specifications and application case studies on PEEK in automotive applications, please contact the YFT Tech technical team.