SUPREMAX® BLANKS



FINE ANNEALED BLANKS are borosilicate glass disks, extracted from a plate of Schott Supremax® with a low coefficient of thermal expansion (3.25x10-6/°C) while the standard glass (sodic calcium ) has got 8.5x10-6/°C.
 

The raw glass disk is first levelled and then its edge is grinded down, to get a curve edge surface perpendicular to flat faces.



To obtain blanks with a concave surface, we first give it a spherical shape with the requested radius; the blank is then treated for fine annealing process that lasts 72 to 120 hours, depending on disk diameter and thickness. All stresses coming from the fast cooling of the vitreous cast mass are removed; the blank optical surface is then flattened again and roughly shaped to the requested concave surface.
 

The blank is now ready for next glossing phases.



 

Supremax® Blanks

Blank in inch dimensions Blanks in metric dimensions
Code Diameter
Inch
Thick.
Inch

Code Diameter
mm
Thick.
mm
Price
Euro
BI1015 10"(*) 1.5"
BM25538 255(*) 38 310.00
BI10175 10"(*) 1.75"
BM25545 255(*) 45 358.00
BI1215 12"(*) 1.5"
BM30538 305(*) 38 415.00
BI12175 12"(*) 1.75"
BM30545 305(*) 45 475.00
BI1221 12"(*) 2.1"
BM30552 305(*) 52 528.00
BI1415 14" 1.5"
BM35538 355 38 542.00
BI14175 14" 1.75"
BM35545 355 45 604.00
BI1421 14" 2.1"
BM35552 355 52 658.00
BI1615 16" 1.5"
BM41038 410 38 797.00
BI16175 16" 1.75"
BM41045 410 45 848.00
BI1621 16" 2.1"
BM41052 410 52 943.00
BI1815 18" 1.5"
BM46038 460 38 966.00
BI18175 18" 1.75"
BM46045 460 45 1091.00
BI1821 18" 2.1"
BM46052 460 52 1271.00
BI1825 18" 2.5"(**)
BM46063 460 63(**) 1528.00
BI2015 20" 1.5"
BM51038 510 38 1243.00
BI20175 20" 1.75"
BM51045 510 45 1351.00
BI2021 20" 2.1"
BM51052 510 52 1457.00
BI2025 20" 2.5"(**)
BM51063 510 63(**) 1852.00
BI2215 22" 1.5"
BM56038 560 38 1288.00
BI22175 22" 1.75"
BM56045 560 45 1475.00
BI2221 22" 2.1"
BM56052 560 52 1678.00
BI2225 22" 2.5"(**)
BM56063 560 63(**) 2226.00
BI2415 24" 1.5"
BM61038 610 38 1513.00
BI24175 24" 1.75"
BM61045 610 45 1763.00
BI2421 24" 2.1"
BM61052 610 52 2012.00
BI2425 24" 2.5"(**)
BM61063 610 63(**) 2644.00
BI25175 25" 1.75"
BM63545 635 45 1999.00
BI2521 25" 2.1"
BM63552 635 52 2324.00
BI2525 25" 2.5"(**)
BM63563 635 63(**) 2942.00
BI28175 28" 1.75"
BM71045 710 45 2463.00
BI2821 28" 2.1"
BM71052 710 52 2880.00
BI2825 28" 2.5"(**)
BM71063 710 63(**) 3582.00
BI3021 30" 2.1"
BM76052 760 52 3298.00
BI3025 30" 2.5"(**)
BM76063 760 63(**) 4157.00
BI3221 32" 2.1"
BM81052 810 52 3865.00
BI3225 32" 2.5"(**)
BM81063 810 63(**) 4893.00
BI3621 36"(**) 2.1"
BM91052 910(**) 52 4940.00

(**) 63mm thickness is not produced by Schott, sales until stocks exhausted.
(*) discontinuous.
Standard tolerance on the diameter are +1.0mm -2.0mm, on the thickness are ±2.0mm.
Orders are confirmed on receipt of an advance of 15-25% of price list.
Packing is included on the price, excluded vat and delivery cost.

 

The price of our own production blanks includes the packaging cost; here's a typical packaging of a 510mm Pyrex blank.
Packaging of three 40" (1013mm) Pyrex disks
Vertical packaging of three 30" (760mm) diameter glass disks

 

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