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
Name
Code

Flint crown
FK
Light flint
QF

Light crown
QK
Flint
F

Crown
K
Barium
BaF

Phosphate crown
PK
Dense barium
ZBaF

Barium crown
BaK
Dense flint
ZF

Dense crown
ZK
Lanthanum flint
LaF

Lanthanum crown
LaK
Dense lanthanum flint
ZLaF

Spcial crown
TK
Titanium flint
TiF

Crown flint
KF
Special flint
TF