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We are pleased to introduce S-LAL7Q as an optical glass which has improved on chemical durability desired in the region of LAL. S-LAL7Q has the same Refractive Indices and Abbe Number as S-LAL7. In addition, the processability of lens polishing of S-LAL7Q is better than S-LAL7.

1. Improved chemical durability compared to S-LAL7.

2. Acid resistance is improved to Class 4 from Class 5.

3. Water resistance is improved to Class 2 from Class 3.

4. Lower density compared to S-LAL7. Density 3.24 from 3.73.