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LED lens is an optical element with a spherical part of the surface made of transparent substances (such as glass, crystal, plastic, etc.) according to the law of refraction of light. As an optical grade product, it has strict requirements for light transmission, thermal stability, density, refractive index uniformity, turbidity, maximum long-term operating temperature, etc. One of the most commonly used materials for TIR lenses is "PMMA", which is often asked by fans. The most commonly used material for TIR lenses - "PMMA", which is often asked by fans - has been featured in many of OLIGHT's models.Transparent Acrylic Part
What is PMMA?
PMMA is polymethyl methacrylate material, commonly known as plexiglass, acrylic, etc. It is a polymer with good transparency, optical properties, impact resistance and aesthetic properties, is a commonly used glass replacement material, is known as the "Queen of Plastics" organic synthetic transparent materials.Pmma fabrication Part
PMMA's relative molecular mass of about 2 million, and the formation of molecular chain is relatively soft, so PMMA's strength is relatively high, tensile and impact resistance than ordinary glass 7 to 18 times higher. When used as plexiglass, even if it is broken, it will not produce bursts of fragments like ordinary glass.Acrylic processing Component
The main characteristics of PMMA
Colorless and transparent:
Light transmittance of 90% - 92%, toughness, more than 10 times larger than silica glass;
Good performance:
Good dielectric and insulating properties, strong arc resistance, excellent weathering/aging resistance;
High heat resistance:
Tough, hard and rigid characteristics, heat distortion temperature of 80 ℃, bending strength of 110Mpa.
PMMA acrylic Processing
At present, PMMA production technology is mainly suspension polymerization, solution polymerization and the body polymerization of three processes. Industrial production of PMMA, generally small-scale intermittent production to the suspension polymerization process, large-scale continuous production are used solution polymerization and the body polymerization process. PMMA is generally used for casting, injection molding, machining, thermoforming and other processes, and has good post-processing properties.
Wide range of applications
With excellent optical properties, PMMA materials are widely used, of which the main application areas of ordinary PMMA advertising light boxes, signs, lamps, bathtubs, meters, etc., high-end PMMA is used in liquid crystal displays, optical lenses, automobile lampshades, bulletproof glass, aircraft cockpit glass, medical polymer materials, military optical equipment, high-speed rail windows, police shields, high-end diving goggles, etc., by China's Petrochemical and chemical industry "Twelfth Five-Year Plan" development plan included in the "Twelfth Five-Year Plan" high-end petrochemical and chemical products development key list.
Used in optical lenses
PMMA has strong light transmission, heat resistance, and good scratch resistance, is one of the key materials for current lighting equipment.
The advantages of PMMA compared to glass are: easy to shape design, processing and molding, especially some special optical design; more lightweight, PMMA density is nearly half of glass; glass is not recyclable, PMMA can be recycled.
The optical grade PMMA and ordinary grade acrylic also has the difference: optical grade PMMA higher transmittance, good transparency. Ordinary acrylic transmittance is 92%, optical grade PMMA is up to 93%, can be used to do LED lenses, lights, lens products, light guides and so on.
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