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
ItemPropertyTest MethodU/MValue
OpticalUV ResistantEN170%99.99%
HazeASTM D 1003%0.37
VLT Before Photochromic TintASTM D 1003%87
VLT Fully Photochromic TintASTM D 1003%20
Fully Photochromic Tint TimeWeeTect MethodSecond30
Change Back to Photochromic Clear TimeWeeTect MethodMinutes3
Fog Free timeECE22.05/ECE324s>22
Fog Free timeFreezing Testsno fogging
MechanicalHardness 1KGISO 178H1
High velocity impactANSI Z87.1 2010ft/s>300
Cross-Cut tape testASTM D 1000NAPass
Elongation, yield  % 7ISO 527%7
Elongation, break ISO 527 % 110ISO 527%110
Tensile stress, yieldISO 527Mpa60
Tensile modulus  MPaISO 527Mpa2300
Flexural strength, yieldISO 178Mpa100
Flexural modulus ISO 178 MPa 2500ISO 178Mpa2500
Izod notched impact, 20 °CISO 180-1AKJ/m²65
PhysicalGravityISO 1183g/cm³1.2
Water absorption, 24 hoursISO 62%0.15
ThermalMold shrinkageISO527%0.5-0.7
Thermal expansionASTM D6961/ °C7×10-5
Vicat Softening Temp., Rate B / 120(base sheet)ISO 306°C150
HDT, 0.45 MPaISO 75/Be°C138

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