CDGM to Schott Optical Glass Equivalents

Overview

CDGM and Schott glass codes are often compared during optical design review, supplier qualification, and replacement material discussions. This guide lists selected clean cross-reference candidates from the source table and explains how to use them without overstating equivalence.

The data is intended for engineering review. It does not prove that a CDGM glass and a Schott glass are identical, formally approved substitutes, or suitable for production without validation.

How to Read the Table

Start with refractive index nd @ 588 nm and Abbe number vd, then compare manufacturer glass codes and the practical design requirement. A close nd and vd match can support a substitution discussion, but it does not settle transmission, thermal behavior, melt quality, coating performance, or fabrication risk.

For broader background, review the Optical Glass Cross-Reference Guide. If your application is infrared, also compare the requirement with ZnSe, germanium, and other IR optical materials.

Selected CDGM to Schott Cross-Reference Candidates

CDGM	Schott	Ohara	Hoya	nd	vd
H-ZF52	SF57HTULTRA	S-TIH53W	FDS90	1.84666598	23.787324
H-ZF7LA	SF6	S-TIH6	FD60	1.80518932	25.47729
H-ZF13	SF11	S-TIH11	FD110	1.78472134	25.719658
H-ZF12	N-SF14	S-TIH14	FD140	1.76182349	26.613203
H-ZF6	SF4	S-TIH4	FD4	1.75520518	27.547441
H-ZF4A	SF10	S-TIH10	FD10	1.72825449	28.310916
H-ZF3	SF1	S-TIH1	FD1	1.71736082	29.509994
H-ZF11	N-SF15	S-TIM35	FD15	1.69894826	30.053069
H-ZF10	P-SF8	S-TIM28	MP-FD80	1.68892979	31.160527
H-ZLAF75B	N-LASF46B	S-LAH95	TAFD25	1.90366311	31.419748
H-ZF2	SF5	S-TIM25	FD5	1.67270157	32.17888
H-ZLAF71	N-LASF9HT	S-LAH71	-	1.85026018	32.307713
H-ZF1	SF2	S-TIM22	FD2	1.64769325	33.842283
H-ZLAF66	N-LASF45HT	S-LAM66	-	1.80099949	34.972131
H-F4	N-F2	S-TIM2	E-F2	1.62004738	36.34792
H-ZLAF53B	N-LASF40	S-LAH60V	MP-NBFD10-20	1.8339965	37.229136
H-F1	F5	S-TIM5	E-F5	1.60342294	38.009116
H-QF50A	LF5HTI	S-TIL25	E-FL5	1.58143922	40.749269

Why Validation Still Matters

Even when two codes look close, the optical system may depend on more than nd and vd. Transmission range, internal quality, blank size, thermal expansion, environmental exposure, surface finish, coating stack, and inspection requirements can change the practical result.

For custom optical components, the safest workflow is to review the glass candidate against the drawing and application first, then confirm whether the request should be manufactured as glass optics, IR optical components, or another material route.

Request a CDGM to Schott Review

Send the CDGM code, Schott reference, drawing, wavelength range, size, tolerance, coating target, and quantity through the contact page. We will treat the table as a cross-reference candidate list for engineering evaluation.