Cut-to-Size Substrates
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Technical Details of Cut-to-Size Substrates

SCHOTT is committed to innovation and excellence, which is why our products’ technical properties set a uniform high standard. From CTE range to production techniques, our extensive portfolio of cut-to-size substrate glasses offer a proven ability to perform in all situations to the highest of standards.

Technical excellence across the board

Broad CTE range

SCHOTT cut-to-size substrates are designed to perform in a wide range of environments, which is why their coefficient of thermal expansion (CTE) is a key consideration. With CTEs ranging from 3.2 x 10⁻⁶ / ºC – 9.4 x 10⁻⁶ / ºC, there are few fields in which SCHOTT glass cannot meet the challenge.

Thicknesses and sizes to suit

SCHOTT glass cut-to-size substrates have to perform reliably and fit precisely in a variety of applications. We achieve this by offering multiple cut-to-size formats and thicknesses ranging from 0.03 mm up to 25.40 mm.

Mastery of production techniques

SCHOTT employs a number of unique hot forming methods, including down-draw for thin glass, up-draw for homogeneous clear flat glasses, and microfloat for robust chemical and thermal properties. In addition, our cutting, seaming, and laser-marking methods set new industry standards.

Quality processing

All SCHOTT processing methods strictly follow the latest international industry standards, with a number of customization options available. Whatever method suits your requirements, we are always happy to work with you to create a tailored solution.
Up-drawn cut-to-size substrates
Down-drawn cut-to-size substrates
Floated cut-to-size substrates
Cut-to-size substrate materials

Up-drawn cut-to-size substrates

The following specifications are applicable to B 270®: 

 

1. Cutting formats (round, rectangular)

Thickness in mm Max. size1 in mm Min. size1 in mm Tolerance1 in mm
0.9 – 8.0 1600 x 800 20 x 20 ± 1.0
9.0 – 10.0  1600 x 800  100 x 100 ± 2.0 

(1) Other sizes or tolerances on request

 

2. Glass quality properties


Bulk defects

Quality properties & Specification
Bubbles: length and width ≤ 0.8 mm: allowed 
Area  < 0.1 m² ≥ 0.1 to < 0.5 m²  ≥ 0.5 to < 1.0 m²  ≥ 1.0 m² 
 Width ≤ 0.8 mm  ≤ 0.8 mm ≤ 0.8 mm   ≤ 0.8 mm  
Length  ≤ 5.0 mm  ≤ 8.0 mm  ≤ 10.0 mm  ≤ 10.0 mm 
Max. quantity ≤ 3 pcs.   ≤ 4 pcs. ≤ 6 pcs.  ≤ 8 pc. 
Knots, stones  Ø ≤ 1.5 mm: allowed
Knot accumulation not allowed 
Striae acc. to limit sample 

 

Surface defects

Quality properties
 Specification
Scratches see specification for bubbles above
Hair scratches  length ≤ 30 mm: allowed 
Shutter and roller marks  g = (Length+Width)/2   ≤ 1.5 mm: allowed 
Open bubbles  see specification for bubbles above 
Cullets which stick to the surface  Ø < 1.0 mm: allowed 
Drawing stripes  front and backside according to limit sample  

 

Edge defects

Quality properties Specification
Chipping ≤ ½ of glass thickness allowed 
Cracks  not allowed 

 

Defect accumulation
An accumulation of more then 10 defects, also allowed defects, in an area of 250 x 250 mm is not allowed.

 

Down-drawn cut-to-size substrates

The following specifications are applicable to D 263® T eco, D 263® LA eco, AF 32® eco, Solar Glass 0787 and B 270® Thin:

 

1. Base material formats

Base material1 Dimensions D 263® T eco
in mm
 D 263® LA eco 
in mm		 AF 32® eco 
in mm		 SCHOTT® Solar Glass 0787
in mm		 B 270® Thin
in mm
Formats
 standard 510 x 430  415 x 360  440 x 360  560 x 380  420 x 340 
Ultra-Thin Glass2 (thickness ≤ 0.1 mm) max.  440 x 360  -  510 x 430  560 x 380  - 
Thickness range   min.  0.03  0.3  0.03  0.07  0.3 
Thickness range  max.  1.1  0.7  0.5  0.15  0.9 

(1) Base material is for SCHOTT internal use only
(2) Ultra-Thin Glass is available as sheets only
Special dimensions upon request

 
 

2. Geometrical properties

Thickness1 in mm Glass Types2 Thickness Tolerance3
in µm 		 Total Thickness
Variation3 (TTV) in µm 		 Flatness4
in µm 
0.03 D 263® T eco | AF 32® eco ± 10 – 15   ≤ 15  ≤ 3000 
0.05  D 263® T eco | AF 32® eco   ± 10 – 15  ≤ 15  ≤ 3000 
0.07  D 263® T eco | AF 32® eco | SCHOTT® Solar Glass 0787  ± 10 – 15  ≤ 15 – 30   ≤ 3000 – 3500 
0.1  D 263® T eco | AF 32® eco | SCHOTT® Solar Glass 0787  ± 10 – 20  ≤ 10 – 30  ≤ 1500 – 3500 
0.125 – 0.150  SCHOTT® Solar Glass 0787 ± 15  ≤ 30  ≤ 3500 
0.145 – 0.175  D 263® T eco | AF 32® eco  ± 10 – 15  ≤ 10 – 15  ≤ 1500 
0.200 – 0.210  D 263® T eco | AF 32® eco  ± 15  ≤ 15  ≤ 200 
0.25  D 263® T eco | AF 32® eco  ± 15  ≤ 15  ≤ 150
0.3 D 263® T eco | D 263® LA eco | AF 32® eco | B 270® Thin  ± 15 – 20  ≤ 15 – 20  ≤ 150 – 400 
0.4  D 263® T eco | D 263® LA eco | AF 32® eco  ± 15 – 20  ≤ 15 – 20  ≤ 150 – 400 
0.5 – 0.55 D 263® T eco | D 263® LA eco | AF 32® eco ± 15 – 30  ≤ 15 – 20  ≤ 150 – 400 
0.7  D 263® T eco | D 263® LA eco ± 15 – 50  ≤ 15 – 30   ≤ 250 – 400 
0.9  D 263® T eco | B 270® Thin ± 20 – 25   ≤ 20- 25  ≤ 250 
1.0  D 263® T eco   ± 20 – 30  ≤ 20 – 25  ≤ 250 
1.1  D 263® T eco ± 20 – 50  ≤ 25  ≤ 250 

(1) other thickness on request
(2) other glass types on request
(3) acc. to SEMI MF 1530 GBIR
(4) acc. to SEMI M1 GBINFER

 

3. Cutting formats

Thickness Format1   Maximum size2
in mm 		 Minimum size2
in mm		 Tolerance2
in mm 
0.03 mm to ≤ 0.1 mm  rectangular  base material minus 40 mm  20 x 20  ± 0.5 
0.03 mm to ≤ 0.1 mm  round  base material minus 40 mm  Ø 50  ± 0.5 
≥ 0.1 mm to ≤ 0.4 mm  rectangular  base material minus 40 mm  10 x 10  ± 0.2 
≥ 0.1 mm to ≤ 0.4 mm  round  base material minus 40 mm  Ø 40  ± 0.2 
> 0.4 mm to ≤ 1.1 mm  rectangular  base material minus 40 mm  10 x 10  ± 0.2 
> 0.4 mm to ≤ 1.1 mm  round  base material minus 40 mm   Ø 40  ± 0.5 

(1) Customized free-form formates on request
(2) Other sizes and tolerances on request

 

4. Glass quality properties

 
Parallelism 
Thickness in mm Specification
0.03 - < 0.1 ≤  1.0 % (of max. edge)
0.1 - 1.1  ≤  0.5 % (of max. edge) 

 

Squareness

Thickness in mm Specification
0.03 - < 0.1

≤  2.0 % (of max. edge)
0.1 - 1.1    ≤  1.0 % (of max. edge) 

 

Spot type defects (e.g. inclusions, bubbles, knots, particles, digs)

Dimension Specification
Max. edge format or Ø < 100 mm < 0.1 mm: ignore
≥ 0.1 mm to ≤ 0.2 mm: ≤ 1 pc.
> 0.2 mm: none 
100 mm to 300 mm  < 0.1 mm: ignore 
≥ 0.1 mm to ≤ 0.2 mm: ≤ 2 pcs. 
> 0.2 mm: none 
> 300 mm  < 0.1 mm:  ignore 
≥ 0.1 mm to ≤ 0.2 mm: ≤ 3 pcs. 
> 0.2 mm: none 

 

Linear defects (e.g. scratches)  |  L: length W: width

Dimension Specification
Max. edge format or Ø < 100 mm L ≤ 25 mm and  W ≤ 20 µm: ignore 
L ≤ 25 mm and  W > 20 to 50 µm: ≤ 1 pc. 
L > 25 mm or     W > 50 µm: none  
100 mm to 300 mm  ≤ 2 defects allowed (as defined for stock sheets) 
> 300 mm  ≤ 3 defects allowed (as defined for stock sheets) 

 

Edge defects (e.g. chips, protrusions)

Thickness in mm Specification
< 0.5 < 0.1 mm: ignore
< 0.5 mm: ≤ 2 pcs. per edge  
> 0.5 mm: none 
> 0.5 to < 1.1  0.2 mm: ignore 
< 1.0 mm: ≤ 2 pcs. per edge 
> 1.0 mm: none 

 

Cracks

Condition Specification
visible none

 

Contaminations

Condition Specification
Inspection condition: 
light source ≤ 5 klux, dark environment,
duration 15s/pc.,
cleaned 		 Contaminations (e.g. glove marks, conveyor belt marks, paper marks, haze, cullet's, dust etc.) can be judged after a suitable cleaning process; cleaning recommendations or technical assistance on cleaning can be provided upon request. Contaminations on un-cleaned glasses will be ignored and are permissible without any size restriction.

 

Quality assurance

Condition Specification
AQL according to ISO 2859
  • 100 % in-process inspection for cosmetic defects
  • SPC for geometrical properties
  • AQL level will variegate depending on batch sizes, thickness and required quality level.

Floated cut-to-size substrates

The following specifications are applicable to BOROFLOAT®:

Thickness (mm) Size min (mm) Size max (mm) Tolerances
0.4 - 25.4 10 x 10 1.200 x 1.200 ± 0.3 to ± 5 mm (higher tolerances for greater thicknesses);
greater thicknesses on request
1.1 - 21.0  50 x 50  2.200 x 4.200 

Cut-to-size substrate materials

The following materials are available as cut-to-size substrates:

  • D 263® T eco
  • D 263® LA eco
  • BOROFLOAT®
  • AF 32® eco
  • B 270® 
  • Solar Glass 0787

 To find out more, please see the related materials on the overview page.

Want to know more? Let’s talk

Whether you need more information, samples, a quote, or advice for a project, we would be delighted to talk to you.

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