Overview
Light Guide Plate (LGP) Grade PMMA is a premium polymethyl methacrylate formulation engineered specifically for backlight applications in LCD displays. Unlike standard acrylic, it undergoes additional purification and polymerization control to achieve exceptional optical clarity (≥92% transmittance) and minimal light scattering. Developed in the 1990s alongside LCD technology, this material enables thin, energy-efficient backlight systems by uniformly distributing LED light via microscopic surface patterns. Major producers include Mitsubishi Chemical, LG MMA, and Chi Mei Corporation, with global demand driven by consumer electronics and automotive display markets.
Physical and Chemical Properties
LGP-grade PMMA distinguishes itself through controlled molecular weight distribution (typically 100,000-150,000 g/mol) that balances thermal stability (Vicat softening point: 95-105°C) with injection molding processability. Its refractive index (1.49) closely matches that of common optical adhesives, minimizing interface light loss. The material exhibits excellent weatherability, retaining 90% initial transmittance after 1,000 hours of 85°C/85% RH testing. Additives like UV stabilizers (e.g., benzotriazoles) are incorporated without compromising optical performance. Thermal expansion coefficient (7×10^-5/°C) requires consideration in large-panel designs.
Main Applications
Primary use is in LCD backlight units (BLUs) for TVs (80-85% market share), monitors, and mobile devices, where thicknesses range from 0.3mm (smartphones) to 3mm (large signage). Emerging applications include automotive HUDs (head-up displays) requiring heat-resistant variants and VR/AR waveguide components. In non-display sectors, LGP-grade PMMA serves in medical light guides (endoscopy), architectural light-diffusing panels, and precision optics. The material's ability to transmit blue light efficiently (450nm wavelength) makes it suitable for LED horticultural lighting systems.
Safety and Storage
While PMMA is generally non-toxic (FDA compliant for food contact), LGP-grade processing generates fine dust requiring NIOSH-approved particulate respirators during machining. Thermal degradation above 200°C releases methyl methacrylate monomer, necessitating proper ventilation. Sheets should be stored horizontally on padded racks to prevent stress whitening. Protective films must remain intact until fabrication to avoid surface scratching. Long-term UV exposure causes slight yellowing (ΔYI <1.5 after 5 years indoor use), so UV-blocking packaging is recommended for extended storage.
B2B Procurement Guide
Key specifications to verify include optical homogeneity (≤0.5% transmittance variation across sheet), surface roughness (Ra ≤0.05μm for laser etching), and birefringence (<10nm retardation). For edge-lit applications, request edge-polishing quality data (90° ±0.5° angle tolerance). Supply agreements should address batch-to-batch consistency, with penalty clauses for haze >1% or yellow index shifts >0.8. Just-in-time delivery is preferable to minimize warehouse aging effects. For large orders (≥20 tons), negotiate testing allowances for destructive sampling (e.g., melt flow rate verification).
Related Manufacturers
- 主营：PPO、PPE、PC、导光、POM、PC/ABS、聚碳酸酯、聚甲醛、聚苯醚、工程塑胶、ABS、PA66、尼龙、PBT、TPU、聚氨酯、PPS、聚苯硫醚、POE、EVA、TPEE、PET、LCP、PA6、ASA、PMMA
- 主营：改性塑料、塑胶原料、改性ABS、光学级PC、改性PC/ABS、PC、POM、改性PA6、改性PA66、PPO、阻燃合金、阻燃ABS、PC/ABS、PP、PA全系、改性PET、改性PC、ABS、PA6、PA66、PBT、HDPE、LDPE、PPS、PMMA、GPPS
- 主营：工程塑料、耐高温塑料、通用塑料、导光板、增韧塑料、热塑弹性体塑料
- 主营：PVDF、PVDF彩色料、PFA、导光板、FEP、PTFE、PEEK、PEI、PSU、PCTFE、ECTFE、PES
- 主营：PA66、TPU、ABS、导光板、PC、POM、PP、PA6、PET、PA12、POE、HDPE、LLDPE、EVA、PCTG、PA46、PVC、PPS、PPO、AS、HIPS、PMMA、PC-ABS、PETG、ASA、MDPE
- 主营：ABS塑胶粒、PC塑胶粒、PMMA亚克力、食品级塑胶粒、医用级塑胶粒、PA尼龙、PBT塑胶粒、PCTG塑胶粒、TPE弹性体、TPU塑胶粒、阻燃塑胶、增强塑胶、增韧塑胶、耐高温塑胶、透明塑胶粒、环保塑胶粒、PP塑胶粒、PE塑胶粒、PS塑胶粒、EVA塑胶粒、POM聚甲醛、通用塑胶粒、高温尼龙料、透明pc、pc
- 主营：聚丙烯、塑胶颗粒、塑料颗粒、导光板、家电pp颗粒、聚乙烯材料、耐冲击共聚pp、普瑞曼 PP、TPE 塑胶原料、巴塞尔 EP332L、Durethan、巴塞尔 PP颗粒、FR3020、ABS 754、日本旭化成 PA66、GN2201FM、GP1006FMR、LG化学PC、SC2302、GP1006FH、SC1004ML、旭化成 PA66、旭化成 尼龙66、工程塑胶、L1940SZ、PP FC9413G
- 主营：导光板、工程原料
- 主营：POM美国杜邦、PA66杜邦、TPV塞拉尼斯、导光板、PPA瑞士EMS、ABS台湾奇美、EMA韩国sk、PETG韩国sk、PC沙伯基础、COC德国TOPAS、POK韩国晓星、PA6巴斯夫、EBA西班牙雷普索尔、EVA美国杜邦、PA12瑞士EMS、TPU德国巴斯夫、PARA比利时索尔维、PPO沙伯基础、PPS日本东丽、PPSU索尔维、PES美国索尔维、PSU索尔维、PCTG美国伊士曼、HDPE利安德巴塞尔、PMMA韩国LG、pcabs台化
- 主营：工程塑料、通用塑料、热塑性弹性体、导光板、合金塑料、塑胶原料
- 主营：PA、PC、PBT、导光板级PC、PP、pc/abs、PC/PBT、PC/PET、POM、LCP、PPS、耐高温、耐化学、耐低温、代替金属、弹性体
- 主营：PE聚乙烯、PP聚丙烯、PC聚碳酸酯、导光板PMMA、ABS、POM、PS、PA66、EVA、TPU、PET、PBT、高胶粉、PE PP粉、PVC
- 主营：PA66、POM、PC、导光板级PMMA、PP、ABS、TPE、PCTG
- 主营：PP、ABS、PC、LEXAN导电FR、PC/ABS、PC/PBT、PA尼龙、高温尼龙、PPS、LCP、PA46、PPA、PA9T、PA6T、弹性体、热熔胶EVA/EAA/EBA/EMA、橡胶
- 主营：5630f105a、阻燃剂、电子领、三菱导光板级PMMA、共聚物、聚合物、安全帽、玻璃珠、阻燃lcp、化妆瓶、挤出机、口红管、聚酰胺、照明灯、玻纤增、防撞桶、超细粉、奶瓶料、牙膏管、连接器、尼龙料、显示器、转接器、润滑剂、汽车件、齿轮料