Photochromic Technology


WeeTect Photochromic Technology (WPT) includes two types of photochromic technologies. Once of them is photochromic coating. The substrate is injection molded polycarbonate lenses, polycarbonate visors or polycarbonate face shields. Then we use special photochromic material to do photochromic coating on the surface. Another photochromic technology is photochromic co-mold. We firstly perform the special photochromic film or photochromic sheet. Then we will process co-injection molding with the photochromic film to produce photochromic lenses or photochromic goggles. WeeTect Photochromic Technology (WPT) can be applied to make all kinds of photochromic lenses, photochromic sunglasses, transition lenses, photochromic goggles, photochromic lenses, photochromic visor, photochromic face shield, and more.

WeeTect Photochromic Technology (WPT) is one of the best photochromic technologies with an optical clarify on photochromic clear situation, and turns to photochromic tint quickly under UV radiation. In advance, WeeTect Photochromic Technology (WPT) can combine other surface treatments such as anti-fog coating, anti-scratch coating, iridium coating and more. As an eye and face protection solution provider, WeeTect holds the know-how of photochromic coating and co-mold photochromic technology. We are glad to co-develop other special photochromic applications for niche market.

Photochromic Technology Review of Advantages:

  • Convenience: One piece of photochromic lenses, photochromic visor or photochromic face shield can fulfill varying light conditions.
  • UV protection: WeeTect Photochromic Technology (WPT)absorbs 100% UV harmful radiation.
  • One stop solution: WeeTect Photochromic Technology (WPT)also combines anti-fog coating, hard coating, abrasion resistant coating, iridium coating or other color tinting together.
  • Reduce cost: As a capable photochromic lens manufacturer, WeeTect can support you to reduce cost.

PS: Here is a photochromic ebook for you to learn more about photochromic technology

More Details
Item Property Test Method U/M Value
Optical UV Resistant EN170 % 99.99%
Haze ASTM D 1003 % 0.37
VLT Before Photochromic Tint ASTM D 1003 % 87
VLT Fully Photochromic Tint ASTM D 1003 % 20
Fully Photochromic Tint Time WeeTect Method Second 30
Change Back to Photochromic Clear Time WeeTect Method Minutes 3
Fog Free time ECE22.05/ECE324 s >22
Fog Free time Freezing Test s no fogging
Mechanical Hardness 1KG ISO 178 H 1
High velocity impact ANSI Z87.1 2010 ft/s >300
Cross-Cut tape test ASTM D 1000 NA Pass
Elongation, yield  % 7 ISO 527 % 7
Elongation, break ISO 527 % 110 ISO 527 % 110
Tensile stress, yield ISO 527 Mpa 60
Tensile modulus  MPa ISO 527 Mpa 2300
Flexural strength, yield ISO 178 Mpa 100
Flexural modulus ISO 178 MPa 2500 ISO 178 Mpa 2500
Izod notched impact, 20 °C ISO 180-1A KJ/m² 65
Physical Gravity ISO 1183 g/cm³ 1.2
Water absorption, 24 hours ISO 62 % 0.15
Thermal Mold shrinkage ISO527 % 0.5-0.7
Thermal expansion ASTM D696 1/ °C 7×10-5
Vicat Softening Temp., Rate B / 120(base sheet) ISO 306 °C 150
HDT, 0.45 MPa ISO 75/Be °C 138

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