Controls: Index and dispersion variation in optical glass

Related Terms:  Homogeneity, bubble grade, striae grade, stress birefrigence, international code, 6-digit code

Units: Dimensionless

Specification Must Contain: Nominal value and linear tolerance (Dispersion tolerance typically given a percentage)

Optimax Preferred Specification: Nd and Vd

Reasons: Correlates with international code, information widely available

Manufacturing Standards: MIL-G-174, ISO 10110-4, OEOSC OP3.001-2001

Find out more by downloading our technical note on Glass Quality