HT-R II is a newly developed and high-performance lens material, which combined the feature of CR-39 and Rubber. HT-R II lens can be decentred and toric shape.

Benefit:
* Same as CR-39 sunlens
* High resistance to chemical, ideal for Acetate frame.
* Low stress, cracking & crazing resistance.
* Optically superior, Transparent and clear
* Easily worked & reliable
* 100% UV protection
* High thermal stability, can be made a variety of shape(Toric, Decentred etc.)
* Can be compatible with all hongtaig &ˉs optical coatings.
* Limited scratch resistance, same as CR-39.

Comparison Table (Material)