[Ⅰ] Definition of Infrared-Transparent Polymer Materials

Infrared-transparent polymer materials – Raw material pellets – 25Kg/bag

NIR-transparent polymer material pellets and profiles

Transmittance spectrum of FLIERMOUSE NIR PMMA M95 series (specific grade)

【I】Core Definitions and Classification of Near Infrared Transparent Plastic Materials

Definition

• Functional Characteristics: Transmittance >90% in specific infrared bands (NIR/MIR/FIR) while blocking visible/UV light (e.g., NIR materials block 99% UV). Predominantly black in appearance.
• Classification Criteria:Band Wavelength RangeTypical Materials Applications Near-Infrared 780~1650 nm PC, PMMA, ABS, PET Consumer electronics, Automotive, Security Mid-Infrared 2000~5000 nm COP Medical devices (experimental) Far-Infrared 7000~14000 nm PTFE Military, Aerospace Ultra-Long Wave 1 mm~100 m Electromagnetic wave materialsCommunications, Radar

【II】Near-Infrared (NIR) Transparent Plastics: Comparative Selection Guide

Material	Typical Grade	Advantages	Disadvantages	Key Applications
NIR PC	C92 Series	High impact resistance (drop-proof), HDT 137°C	Low surface hardness, scratch-prone, transmittance <94%	LiDAR windows, security camera filters
NIR PMMA	M95 Series	Highest transmittance (94%), weather resistance	Brittle, low thermal stability (HDT ≈90°C)	Optical lenses, medical endoscopes
NIR ABS	A90 Series	Low density (1.04–1.06 g/cm³), easy processing	Inferior thermal/chemical resistance vs. PC/PMMA	Large appliance housings, robot navigation modules
NIR PET	–	Chemical resistance, low cost	Crystallinity-induced uneven transmittance	Sensor windows, optical packaging

【III】Developments in Mid- and Far-Infrared Materials

Mid-Infrared (2000–5000 nm)

• COP (Cyclo Olefin Polymer): Low birefringence, cryogenic resistance (-100°C), used in missile IR windows and astronaut visors.

Far-Infrared (7000–14000 nm)

• PTFE (Polytetrafluoroethylene): Stable broadband transmittance, challenging processing (sintering required).

【IV】Key R&D and Testing Technologies

Core Technical Pathways

1. Molecular Structure Modulation:
   • Side-chain modification: Adjust ester group ratios in PC to reduce C-H bond IR absorption peaks.
   • Additive formulation: Nano-ZnSe (enhances MIR transmittance) or SiO₂ (improves abrasion resistance).
2. Band Customization:
   • Case study: Suppress 1400–1500 nm water absorption peaks to align with 1550 nm LiDAR wavelengths.
3. Performance Balancing:
   • Incorporate benzotriazole UV absorbers while maintaining >90% IR transmittance.

Testing Equipment List

Test Item	Equipment	Key Parameters
IR Transmittance	FTIR Spectrometer	Wavelength resolution ≤4 cm⁻¹
Mechanical Properties	Universal Tensile Tester, Izod Impact Tester	Tensile speed: 5 mm/min
Thermal Stability	Heat Deflection Temperature (HDT) Tester	Load: 1.82 MPa
Flammability	UL-94 Combustion Tester	Vertical burn rating (V0/V1/V2)

【V】Core Application Scenarios and Case Studies

Autonomous Driving & Automotive Industry

• ADAS LiDAR Window:
  • Material: NIR PMMA M95-1073J (94% transmittance, 105°C heat resistance).
  • Validation: Passes 85°C/85% RH dual-85 test, SAE J400 gravel impact resistance.

Security & Surveillance

• Covert IR Illumination Filter:
  • Material: Black NIR PC C92-1073 (>99% visible light blocking, 93% transmittance @850 nm).

Medical Sterilization Devices

• Endoscope Sleeve:
  • Material: COC (γ-ray sterilization resistance, >90% transmittance @3–5 μm).

【VI】Injection Molding Full-Process Specifications

Mold Design Requirements

Parameter	Specification	Impact
Optical precision (Rt)	<0.5 μm	Light path deviation
Surface roughness (Ra)	<0.01 μm	Reduces diffuse reflection (>5%)
Mold lifespan	>380,000 cycles	Prevents optical surface wear

Injection Machine & Screw Selection

Material	Screw Type	L/D Ratio	Compression Ratio	Machine Type
NIR PC C92	Gradual compression (40–50% zone)	15–20	2–3	Electric precision press
NIR PMMA M95	Gradual compression (≥50% zone)	15–20	2–3	Electric precision press
NIR ABS A90	Gradual compression (20–30% zone)	15–20	2–3	Electric precision press

Process Parameters

Material	Drying Conditions	Mold Temperature	Melt Temperature	Critical Notes
NIR PC C92	120°C, 3–6h	80–120°C (heated)	260–300°C	Avoid multi-stage injection (prevents molecular orientation imbalance)
NIR PMMA M95	80–95°C, 3–4h	50–65°C	200–240°C	Packing pressure ≤80% (prevents stress cracking)
NIR ABS A90	90°C, 2–4h	Ambient cooling	180–220°C	Mold temp >40°C causes shrinkage fluctuation

【VII】Future Trends and Challenges

1. Metamaterial Structures: Biomimetic moth-eye nanostructures (period <1 μm) for broadband transmittance enhancement (+5–8%).
2. Hybrid Materials: PC/PMMA blends (with compatibilizers) balancing hardness and transmittance.
3. Eco-Friendly Upgrades: Halogen-free flame-retardant NIR ABS (UL94 V0 certification).

Engineer Recommendations

• Material Selection Priority: Transmittance > Environmental resistance > Mechanical properties > Cost.
• NIR-transmissive thermoplastic(PMMA) with high transmittance (94%) at 850nm/940nm
• NIR-transmissive thermoplastic(PC) with high transmittance (92%) at 850nm/940nm
• NIR-transmissive thermoplastic(ABS) with high transmittance (89%) at 850nm/940nm.
• Process Optimization: Implement in-mold stress monitoring systems (e.g., Kistler sensors) for real-time parameter adjustment.

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