Chalcogenide Glass

Chalcogenide Glass

  • CLASSIC-1

  • CLASSIC-2

  • CLASSIC-3

  • CLASSIC-4

  • CLASSIC-5

  • CLASSIC-6

Product Information

CLASSIC-1 glass, with the composition As40S60, has extended transmission in the visible spectrum compared to other chalcogenides, making it a useful selection for applications that benefit from additional visible alignment. CLASSIC-1 glass is equivalent to industry composition AMTIR-6.

Typical Forms of Supply

Form is dependent on customer needs, including billets, rods, spheres, cut or polished blanks & near-net preforms.

Current maximum size is 50 mm diameter x 90 mm length.

Technical Information Here

Product Information

CLASSIC-2 glass, with the composition Ge33As12Se55, highlights the ability to tailor chalcogenide glass compositions with
specific optical, thermal, and mechanical design requirements — especially when a specific refractive index or thermal
expansion is needed. CLASSIC-2 glass is equivalent to industry compositions IRG22, IG2, and AMTIR-1.

Typical Forms of Supply

Form is dependent on customer needs, including billets, rods, spheres, cut or polished blanks & near-net preforms.

Current maximum size is 30 mm diameter x 90 mm length.

Technical Information Here

Product Information

CLASSIC-3 glass, with the composition Ge30As13Se32Te25, has extended infrared transmission, compared to other
chalcogenide glasses. CLASSIC-3 glass is equivalent to industry compositions IRG23 and IG3.

Typical Forms of Supply

Form is dependent on customer needs, including billets, rods, spheres, cut or polished blanks & near-net preforms.


Current maximum size is 30 mm diameter x 90 mm length.

Technical Information Here

Product Information

CLASSIC-4 glass, with the composition Ge10As40Se50, highlights the ability to tailor chalcogenide glass compositions with
specific optical, thermal, and mechanical design requirements — especially when a specific refractive index or thermal
expansion is needed. CLASSIC-4 glass is equivalent to industry compositions IRG24 and IG4.

Typical Forms of Supply

Form is dependent on customer needs, including billets, rods, spheres, cut or polished blanks & near-net preforms.


Current maximum size is 30 mm diameter x 90 mm length.

Technical Information Here

Product Information

CLASSIC-5 glass, with the composition Ge28Sb12Se60, is widely employed in the glass molding industry because of its excellent thermal stability compared to other chalcogenide glasses. CLASSIC-5 glass is equivalent to industry compositions IRG25,
IG5, BD-2 and AMTIR-3. The glass is arsenic-free.

Typical Forms of Supply

Form is dependent on customer needs, including billets, rods, spheres, cut or polished blanks & near-net preforms.


Current maximum size is 30 mm diameter x 90 mm length.

Technical Information Here

Product Information

CLASSIC-6 glass, with the composition As40Se60, is the most widely deployed of chalcogenide glasses in industrial and
defense applications due to its low cost and large transmission window. CLASSIC-6 glass is equivalent to industry compositions
IRG26 and IG6.

Typical Forms of Supply

Form is dependent on customer needs, including billets, rods, spheres, cut or polished blanks & near-net preforms.


Current maximum size is 100 mm diameter x 100 mm length.

Technical Information Here

Table of Materials

RPO Glass Composition Schott Vitron Amorphous Materials Umicore
CLASSIC-1 As40S60 IRG27   AMTIR-6  
CLASSIC-2 Ge33As12Se55 IRG22 IG2 AMTIR-1  
CLASSIC-3 Ge30As13Se32Te25 IRG23 IG3    
CLASSIC-4 Ge10As40Se50 IRG24 IG4    
CLASSIC-5 Ge28Sb12Se60 IRG25 IG5 AMTIR-3 GASIR-2
CLASSIC-6 As40Se60 IRG26 IG6 AMTIR-2 GASIR-5