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Designation Of Glass Types
Our optical glasses are classified by their main chemical components and are identified by refractive index (nd) and Abbe-number (Vd). Primarily they can be divided into groups, and further they can be identified into various types. Each group has a name and a code, and each type of glass within some group is named by the abbreviated group symbol and an Arab number. We classified them into 18 groups according to their positions on nd- Vd situation chart and their main chemical components.

Name
Code
Flint crown
FK
Light crown
 QK
Crown
 K
Phosphate crown
 PK
Barium crown
 BaK
Dense crown
 ZK
Lanthanum crown
 LaK
Spcial crown
 TK
Crown flint
KF
Name
Code
Light flint
QF
Flint
F
Barium
BaF
Dense barium
ZbaF
Dense flint
ZF
Lanthanum flint
LaF
Dense lanthanum flint
ZlaF
Titanium flint
TiF
Special flint
TF


Comparative and Character of the Colorless Optical Glass
CDGM SCHOTT OHARA HOYA
HIKARI
nd
Vd
CODE
K series
K1 K11
1.49967
62.07
500621
H-K2 BK4 BSL4 BSC4
1.50047
66.02
500660
H-K3 BK5
1.50463
64.72
505647
K4A ZKN7 ZSL7 ZNC7 ZK7
1.50802
61.05
508611
H-K5 BK1 BSL1 BSC1 BK1
1.51007
63.36
510634
H-K6 K7 NSL7 C7 K7
1.51112
60.46
511605
H-K7
1.51478
60.63
515606
K8 NSL2 C2 K2
1.51602
56.79
516568
H-K9L N-BK7 S-BSL7 BSC7 E-BK7
1.5168
64.2
516642
H-UK9L UBK7
1.5168
516642
H-K10 S-NSL3 E-C3 E-K3
1.51818
58.95
518590
H-K11 BALK1 NSL21 BACL1
1.52638
60.61
526602
H-K12 ZK5 ZSL5 ZNC5 ZK5
1.53359
55.47
534555
H-K16 BACL3 BALK3
1.51878
61.69
519617
H-K50 N-K5 S-NSL5 C5 E-K5
1.52249
59.48
522595
H-K51 B270 NSL51 C12 KN1
1.52307
58.64
523568
BaK series
H-BaK1        
1.53028
60.47
530605
H-BaK2 N-BAK2 S-BAL12 BAC2 E-BaK2
1.53996
59.72
540597
H-BaK3   BAL21   PSK1
1.54678
62.78
547628
H-BaK4 N-PSK3 BAL23 PCD3 PSK3
1.55248
63.36
552634
BaK5        
1.56069
58.34
561583
H-BaK6 N-SK11 S-BAL41 BACD11 E-SK11
1.56388
60.76
564608
H-BaK7 N-BAK4 S-BAL14 BAC4 E-BAK4
1.56883
56.04
569560
H-BaK8 N-BAK1 S-BAL11 BAC1 E-BAK1
1.5725
57.49
573575
BaK9 BAK6 BAL16 BAC6  
1.57444
56.45
574565
BaK11 SK20 BAL50   SK20
1.55963
61.21
560612
FK series
H-FK61   S-FPL51 FCD1 E-FK01
1.497
81.61
497816
LaK series
H-LaK1 LAK11 LAL11 LAC11 LAK11
1.6595
57.35
660574
H-LaK2 N-LAK9 S-LAL9 LAC9 E-LAK9
1.69211
54.54
692545
H-LaK3        
1.74693
50.95
747510
H-LaK4L N-LAK21 S-BSM81 LACL60 E-LAK01
1.64
60.2
641601
H-LaK5 N-LAK12 S-LAL12 LAC12 E-LAK12
1.6779
55.52
678555
H-LaK5A N-LAK12 S-LAL12 LAC12 E-LAK12
1.6779
55.52
678555
H-LaK6 LAKN13 S-LAL13 LAC13 E-LAK13
1.6935
53.38
694534
H-LaK7 N-LAK8 S-LAL8 LAC8 E-LAK8
1.713
53.38
713538
H-LaK8A N-LAK10 LAL10 LAC10 E-LAK10
1.72
50.34
720503
LaK10 N-LAK22 LAL54 LAC12 E-LAK04
1.65113
55.89
651559
H-LaK12 LAK24 LAL64    
1.6968
56.18
697562
H-LaK50 N-LAK7 S-LAL7 LAC7 E-LAK7
1.6516
58.4
652584
H-LaK50A N-LAK7 S-LAL7 LAC7 E-LAK7
1.6516
58.4
652584
H-LaK51 N-LAK14 S-LAL14 LAC14 E-LAK14
1.6968
55.53
697555
H-LaK52 N-LAK34 S-LAL18 TaC8 E-LAK18
1.72916
54.68
729547
H-LaK53 N-LAK33 S-YGH51 TaC6 E-LASKH2
1.755
52.32
755523
H-LaK53A N-LAK33 S-YGH51 TaC6 E-LASKH2
1.755
52.32
755523
H-LaK54   S-LAL59 TaC4 E-LAK09
1.734
51.49
734515
QK series
H-QK1 FK1 FSL1 FC1  
1.47047
66.83
470668
H-QK3        
1.48746
70.04
487700
H-QK3L N-FK5 S-FSL5 FC5 E-FK5
1.48749
70.44
487704
ZK series
H-ZK1 PSK2 BAL22 PCD2 PSK2
1.56888
62.93
569629
H-ZK2 SK12 S-BAL42 BACD12 SK12
1.58313
59.46
583595
H-ZK3 N-SK5 S-BAL35 BACD5 E-SK5
1.58913
61.25
589613
H-ZK4 SK3 BSM3 BACD3 BSM3
1.60881
58.86
609589
ZK5 SK8 BSM8 BACD8  
1.61117
55.77
611558
H-ZK6 N-SK4 S-BSM4 BACD4 E-SK4
1.61272
58.58
613586
ZK8 SK9 BSM9 BACD9 SK9
1.61405
55.12
614551
H-ZK9 N-SK16 S-BSM16 BACD16 E-SK16
1.62041
60.34
620603
H-ZK10 N-SK10 S-BSM10 E-BACD10 E-SK10
1.6228
56.71
622567
H-ZK11 N-SK19 S-BSM18 BACD18 E-SK18
1.63854
55.45
639555
H-ZK14 N-SK14 S-BSM14 BACD14 E-SK14
1.60311
60.6
603606
H-ZK15 SK7 BSM7 BACD7 SK7
1.60729
59.46
607595
H-ZK19 SK6 BSM6 BACD6 SK6
1.61375
56.4
614564
H-ZK20 SSK1 BSM21 BACED1 SSK1
1.6172
53.91
617539
H-ZK21 N-SK15 S-BSM15 BACD15 E-SK15
1.62299
58.12
623581
H-ZK50 SK2 BSM2 BACD2 E-SK2
1.60738
56.65
607567
ZK51 SSK4 BSM24 BACED4 SSK4
1.61765
55.14
618551
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