®ECLEAR Photochromic Coatings
ECLEAR photochromic coatings create a reversible, light-responsive tint on qualified lens substrates. The coated lens darkens under an activating light source, changes its visible-light transmission outdoors and returns toward its initial clear state after the activating source is removed. The coating may be applied by dip coating or spin coating, subject to the approved process.
What the material stack contains.
Read the layers in functional order; the exact construction remains grade-specific.
- 01Qualified lens substrate
- 02Compatible hardcoat or adhesion interface
- 03WPC-501 or qualified PCR-501-series photochromic functional layer
- 04Optional protective topcoat after compatibility validation
Named grades for technical selection.
Each ECLEAR model identifies a distinct material role and construction. Manufacturing cross-references remain controlled in the ECLEAR product master for traceability.
Reversible optical absorption controlled by light and temperature.
01Photochromic molecules reversibly change optical state under an activating spectrum. The coated lens darkens while activation continues and returns toward its clear state after the source is removed.
02Darkening and fading are kinetic processes, so temperature, spectral power, irradiance, exposure time and coating thickness must be controlled whenever two samples are compared. A result obtained under one lamp cannot be transferred directly to another test condition.
03The photochromic layer is part of a stack. Its color, adhesion and lifetime depend on the substrate, hardcoat interface, cure and any protective topcoat. ECLEAR validates the complete construction rather than the photochromic sol in isolation.
Performance framed around the application.
Benefits are evaluated on the intended substrate, process and finished assembly.
Reversible tint response under activating light
Compatible coating-route options for lens production
Designed for integration with qualified ECLEAR hardcoat systems
Application engineering for color, response and durability targets
From material definition to a qualified production stack.
Qualification links the material, converting route and customer production line.
Set clear-state, activated-state, color and recovery targets with a test protocol.
Select substrate, hardcoat interface, photochromic layer and optional topcoat.
Stabilize bath, dip or spin profile, film thickness and cure.
Measure complete response curves before and after weathering and use simulation.
Evidence to collect before specification release.
Use representative substrates, process conditions and aging sequences.
- Clear and activated luminous transmittance at a defined temperature
- Darkening and fading curves using a specified source and irradiance
- Color coordinates and uniformity on the final lens geometry
- Intercoat adhesion, abrasion, humidity and accelerated weathering
- Batch-to-batch comparison against an approved golden sample
Values require a method and an approved revision.
Typical values support selection; controlled specifications come from the approved TDS.
Typical values are not specifications. Final limits are subject to the approved ECLEAR TDS and customer validation.
Questions engineers ask before a line trial.
Resolve the material role, interfaces and process window before sampling.
Why can two laboratories report different activation speeds?+
The result changes with sample temperature, source spectrum, intensity, distance, exposure history and the definition of the endpoint. ECLEAR requires the complete method with every reported value.
Can WPC-501 be applied by both dip and spin coating?+
The public platform supports dip- and spin-coating routes, subject to the approved grade, viscosity, part geometry and production process.
Can ECLEAR recommend a grade from an application description alone?+
A first shortlist is possible, but a production recommendation requires the substrate, layer construction, equipment, process sequence, test method and acceptance criteria. ECLEAR normally moves from requirement definition to laboratory matching, samples, line trial and a frozen approved specification.
Are the values shown on this page guaranteed specifications?+
No. Website values and constructions are selection guidance. Guaranteed limits, test conditions, packaging and shelf life are controlled only by the latest ECLEAR-approved TDS, quality agreement and customer qualification record.
Where this platform is evaluated.
Each application still requires stack-level compatibility and line validation.
Parameters to control.
Record the complete process window, not only one nominal setting.
- Control substrate cleanliness, bath condition, withdrawal/spin profile and cure.
- Measure response at defined temperature, activation source, dose and time.
- Evaluate clear-state transmission, activated transmission and recovery as a complete curve.
- Approve the final hardcoat/photochromic/topcoat stack on production parts.
What we need to know.
These inputs allow ECLEAR to narrow the grade and validation plan.
- Q1What substrate and base hardcoat are currently used?
- Q2What activated color and transmission range are required?
- Q3How are darkening and fading measured by the customer?
- Q4What weathering, humidity and abrasion exposure is required?
What a disciplined trial should expose early.
Early failure checks reduce scale-up risk and prevent false material comparisons.
Comparing response rates measured at different temperatures or UV intensities
Color drift caused by thickness or cure variation
Intercoat adhesion failure in an unvalidated layer stack
Assuming one response target applies to every substrate and geometry
Controlled technical documents.
Request the current revision for the selected ECLEAR grade and application.
Typical constructions and application concepts are provided for material selection only. Availability, structure, performance and process conditions are grade-specific and subject to the latest ECLEAR-approved TDS, application testing and final customer qualification.
Related material systems.
Review adjacent materials that interact with this product in the same stack or process.
Validate the complete stack, not one isolated material.
Share the substrate, construction, process and acceptance criteria for a focused recommendation.