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Technical Information

• Production Process

(1) Production Process

• Designation Of Glass Types

(1) Group Designation
(2) Code

• Optical Properties

(1) Refractive Index*
(2) Dispersion Formula
(3) Dispersion* and Abbe-number*
(4) Partial Dispersion Ratio
(5) Abnormal Disparsion
(6) Temperature coefficient of refractive index* (dn / dT)
(7) Temperature Coefficient of Optical Path Length(ds / dT)
(8) Stress Optical Coefficient (B)
(9) Coloration Code*
(10) Internal Transmittance* (τ)
(11) Coloration of Internal Transmittance
(12) Chromaticity

• Chemical Properties

(1) Dimming Resistance (Water Durability by the Powdered Method* (DW))
(2) Staining Resistance* (DA)
(3) Staining Resistance by the Surface Method (TBlue)
(4) Latent Scratch Resistance (DNaOH)
(5) Latent Scratch Resistance (DSTPP)
(6) Intrinsic Chemical Durability to Water (D0)
(7) Climate Resistance* (DH)

• Thermal Properties

(1) Transition Temperature* (Tg)
(2) Sag Temperature (Ts)
(3) Coefficient of Thermal Expansion* (α)
(4) Strain Point (T1014.5)
(5) Annealing Point (T1013)
(6) Softening Point (T107.6)
(7) Coefficient of Thermal Conductivity (λ)
(8) Specific Heat(specific heat capacity) (Cp)

• Mechanical Properties

(1) Knoop Hardness* (HK)
(2) Abrasion Factor* (FA)
(3) Elastic Properties (E, G, μ)
(4) Flexural Strength (Modulus of Rupture)(σb)

• Other Property

(1) Specific Gravity* (d)
(2) Relative Permittivity (εr)
(3) Volume Resistivity (ρV)

1. Properties tagged with an asterisk (*) have been measured in compliance with Japanese Optical Glass Industrial Standards (JOGIS).
2. System International d'Unites (SI) units are used throughout this catalog unless otherwise noted. Special symbol designations found in JIS Z 8202-0 to10, 12, 13:2000 are used where applicable (as when referring to quantities, units, or chemical symbols).
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