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S-LAL12Q

S-LAL12Q - improved processability and chemical durability

S-LAL12Q is an optical glass with improved workability and durability, which can be an issue for glasses in the S-LAL family. With the same optical performance (refractive index and Abbe number) as S-LAL12, the new S-LAL12Q offers improved properties for lens fabrication processes. S-LAL12Q is ideal for use various applications, such as in-vehicle camera lenses, projectors, and interchangeable lenses for photography.

Advantages

  • Improved chemical durability (compared to S-LAL12)
    Powder method Water Resistance [RW(p)]: Grade 1; Powder method Acid Resistance[RA(p)]: Grade 3

  • Lower specific gravity than S-LAL12 – 3.59


COMPARISON S-LAL12Q (New product) S-LAL12 (Conventional product)
Environmental measures category
Refractive index nd 1.67790 1.67790
Abbe number vd 55.35 55.34
Linear expansion coefficient α

(10 -7 /℃)

-30 ~ +70°C 49 72
+100 ~ +300°C 59 86
Transition point Tg (℃) 689 652
Yield point At (℃) 717 679
Coloring degree λ 80 380 360
λ 5 310 285
Chemical durability RW (P) 1 2
RA(P) 3 Five
W(S) 2 2
SR 51.0 53.0
PR 3.0 4.2
Specific Gravity 3.59 4.01
Knoop hardness Hk 700 (7) 560 (6)
Abrasion degree Aa 62 166
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