As automotive ADAS systems and intelligent driving technologies evolve, automotive camera silicone precision seals have become critical components determining the reliability of vehicle "vision systems". Their sealing performance directly impacts the environmental adaptability, imaging stability, and service life of on-board cameras—whether front-facing ADAS lenses, surround-view systems, or parking assist cameras—in harsh conditions like extreme temperatures, vibration, salt spray, and high-pressure water impact .Below, we analyze the core technologies and application values tailored to automotive scenarios.
1.Material System Optimization: Tailored for Automotive Harsh Environments
Substrate Selection
Focus on high-performance optical grade liquid silicone rubber (LSR) such as Momentive LIM 6740 and Wacker LR 3040/3050.
Key properties aligned with automotive requirements:
1)Temperature resistance spans -60℃ to 280℃, maintaining elasticity without deformation after 1000 hours of high-low temperature cycling (adapting to northern winters and tropical summers) .
2)Light transmittance ≥92% (1mm thickness, 550nm wavelength) to avoid interfering with optical signals.
3)Refractive index controlled between 1.41-1.53, matching automotive lens optical parameters.
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Functional Modification for Vehicle-Specific Needs
1)Low shrinkage modification (shrinkage rate 0.3%-0.8%): Ensures dimensional stability of seal grooves, preventing leakage caused by material shrinkage .
2)Antistatic modification: Avoids dust accumulation on lens surfaces, which could degrade imaging quality.
3)Weather-resistant & anti-aging formula: Resists ultraviolet radiation and ozone, achieving a service life of over 10 years .
4)Chemical corrosion resistance: Withstands automotive fluids, acid rain, and car wash detergents to maintain long-term sealing performance .
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2.Precision Molding Process: Meeting ADAS High-Precision Requirements
Mold Manufacturing
Adopt wire-cut EDM + 5-axis CNC milling to achieve dimensional tolerance ≤5μm and surface roughness Ra≤0.02μm. Key automotive-specific optimizations:
1)Zoned temperature control (precision ±0.5℃) to address seal deformation caused by temperature fluctuations during molding.
2)Micro-exhaust grooves + vacuum-assisted exhaust to eliminate bubbles ≤10μm, avoiding seal failure points .
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Injection Molding Control
1)Raw material vacuum defoaming for ≥15 minutes to remove moisture and air, critical for automotive long-term reliability.
2)Segmented injection (5-10mm/s→80-100mm/s→deceleration) + holding pressure 100-150MPa, ensuring uniform material filling.
3)Gradient demolding pressure reduction with rebound ≤5μm, maintaining seal fitting accuracy with camera housings .
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Intelligent Inspection for Automotive Quality Standards
1)3D laser scanning(±1μm)+ AI visual inspection (5μm/pixel) for 100% full inspection of key dimensions, meeting automotive mass production quality control requirements .
2)In-mold sensors + PID algorithm closed-loop control, achieving injection volume precision ±0.001cc to ensure consistent seal performance.
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3.Sealing Structure Innovation: Balancing Protection & Optical Performance
Integrated Design for Vehicle Installation
1)Labyrinth seal structure integrated with O-ring silicone seals, achieving IP69K-level high-pressure waterproofing and dustproofing . It withstands high-pressure car washes and heavy rain without water ingress .
3)Secondary optical technology integrates sealing and optical protection, avoiding stray light interference (stray light attenuation rate ≤5%).
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Interface Optimization for Automotive Materials
1)Laser micro-etching or plasma activation of metal/plastic camera housings (surface energy >50mN/m), reducing interface slip to ≤2μm and enhancing adhesion .
2)Glass-compatible low-corrosion formula with curing shrinkage <0.2%, preventing optical axis deviation (≤0.003°) that affects ADAS positioning accuracy .
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4.Performance Verification & Automotive Scene Adaptation
Core Performance Indicators for Vehicles
1)Leakage rate ≤5×10?13Pa?m3/s, ensuring hermetic sealing against moisture and dust .
2)Vibration resistance up to 40G, fatigue life ≥2 million cycles, adapting to long-term vehicle operation vibrations .
3)Compression set <5% after long-term use, maintaining sealing pressure stability.
4)Salt spray resistance: Passes 1000-hour neutral salt spray test, suitable for coastal and cold regions with de-icing agents .
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Scene-Specific Adaptability
1)ADAS front-facing cameras: Pass IATF 16949 certification, optical axis deviation ≤0.003°, supporting lane keeping and collision avoidance systems .
2)Surround-view camera systems: IP69K waterproof rating, withstanding high-pressure water impact during car washes .
3)Parking assist cameras: Low-temperature resistance down to -60℃, ensuring reliable operation in frigid environments .
4)New energy vehicle cameras: Low outgassing formula meets battery compartment environmental requirements, VOC content compliant with automotive standards .
