Chalcogenide
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CLASSIC-1
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CLASSIC-2
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CLASSIC-3
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CLASSIC-4
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CLASSIC-5
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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.
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.
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.
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.
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.
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.
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 |