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New Glass Types
 

S-LAL21

S-LAL21 is an optical glass for polished lens which has improved on water resistance, acid resistance and mechanical strength required for Automotive camera lenses. Existing glasses at the region of LAL are not so good in acid resistance and the class of the powder method Acid resistance of it is 4 or 5. The current LAL glasses may be difficult to be used for some kinds of Automotive camera lenses. S-LAL21 has improved on chemical durability, that's why it could be used for Automotive camera lenses, as well as projectors, photographic interchangeable lenses and various applications.

(Advantages)
1.Excellent chemical durability
    Powder method Acid resistance is improved to Class 1 at the region of LAL
    Powder method Water resistance is improved to Class 1 at the region of LAL
2.High Mechanical Strength
    Knoop Hardness 690, Class7     Abrasion 60


  S-LAL21
Eco Optical Glass
Refractive Index nd 1.70300
Abbe Number νd 52.38
CTE α
(10-7/°C)
-30~70°C 50
+100~300°C 61
Transformation Point Tg(°C) 767
Yield Point At(°C) 814
Coloring λ80 395
λ5 320
Chemical ResistanceRW(P) 1
RA(P) 1
W(S) 2
SR 4.0
PR 1.0
Specific Gravity 3.85
Knoop Hardness Hk 690[7]
Abrasion Aa 60
Detail Catalog DATA PDF
Available shapes •pressing
•saw cut center-less ground
cylindrical blanks
•cut blanks
Please consult us about available size and tolerance.

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