Irreversible Photochromic Material
A. Principle
By using microencapsulation technology, the special photochromic dyes are encapsulated and made into pigments.
When exposed to UV rays, the pigments will be irradiated and accumulates energy, then the color changes from colorless to coloration gradually and irreversibly.
B. Product Information
Specification：365nm pigment, 254nm sticker
Particle Size：1~10μm
Absorbance：365nm pigment- 100~400nm, 254nm sticker- 100~280nm
Certification：EN-71-3, RoHS
Standard Colors：
254nm sticker- Rose Red
365nm pigment- Blue, Green
(The above colors are for reference only.)
C. Available Forms & Applicability：
| No. | Forms | 365nm Pigment | 254nm sticker |
|---|---|---|---|
| 01 | Solvent：Ink, Paint | Suggest Concentrations：15~40%w/w |
|
| 02 | Aqueous：Ink, Paint | ||
| 03 | Plastic Injection, Extrusion |
：Applicable、 ：Conditionally Applicable、 ：Not Applicable。
D. Notice：
1. The lighting in the processing environment should be below 500nm (such as photolithography room or indirect illumination) to prevent irreversible coloration.
2. Avoid using UV drying and exceed 130°C hot-air drying.
3. The materials and products should be packaged in opaque black bags to avoid direct exposure to the light.
4. It’s recommended to use neutral or slightly alkaline resins.
5. The pigments will only show slight coloration if exposed to insufficient UV energy. After placing for a while, the color will gradually revert to colorless.