D 263 T

Special Properties

• Low microroughness (typically < 1 nm RMS)
• Excellent flatness
• Clear and practically colorless appearance
• High chemical resistance
• Can be laser-marked
• Very thin standard thicknesses down to 0.03 mm
• Colorless borosilicate glass
• Can be cut with a laser
• Flexible at low thicknesses

Typical Applications

• Cover glass
• Thin and ultra-thin glass substrates
• Semiconductor packaging
• Optoelectronic components
• Substrates for optical coatings and filters
• CCD chip covers
• Display glass (PMLCD, AMLCD and TFT displays)
• Electroluminescence display technology
• Microsheets for microscope slides
• Optical windows
• Micro-optics technology
• Ultra-thin glass applications
• Sensor covers
• High-quality coverslips
• Thin glass wafer applications
• Thin glass and microsheet applications

Related glass types

• AF 32^® eco (alkali-free alumina-borosilicate thin glass)
• MEMpax^® (thin borosilicate glass)
• AS 87 eco (ultra-thin aluminosilicate glass)
• Selected float glass (soda-lime thin glass)
• AF 45 (modified borosilicate display glass)
• 0211 (alkali reduced borosilicate thin glass)

Request for Quotation

48-hour express service

D 263 T is a nearly colorless flat borosilicate thin glass made by SCHOTT. The specific properties and an extensive range of standard thicknesses make D 263 T specialty glass ideal for many technical glass applications. Due to the very smooth fire-polished surfaces, D 263 T glass does not require an additional mechanical polishing treatment. D 263 T exceeds the surface quality grade, smoothness, and flatness of most commercial polishing processes. The micro-roughness of the glass surfaces is typically less than 1 nm (RMS).

Measured against optical standards that apply to thicker glass, the possible flatness of ultra-thin glass is limited for technical and physical reasons. The natural weight alone is a limiting factor for the possible flatness of ultra-thin glass. Nevertheless, even low glass thicknesses offer excellent flatness and optical surface quality that mechanically polished thin glass can hardly outperform.

SCHOTT produces D 263 T borosilicate thin glass by melting the purest raw materials. The specialty glass is resistant to chemical attack and offers a high uniform optical transmittance in the visible range. Moreover, D 263 T glass offers higher infrared transmission than most other thin glass materials (you can obtain IR transmittance curves on request).

D 263 glass is a perfect choice for display technology, but it is also an ideal substrate for optics, micro-optics, and glass wafer applications. It is often the best glass material for microscope slides and thin or ultra-thin coverslips with high optical quality in research and science.

The glass is nearly always available from us in various extremely thin thicknesses with very low tolerances. Our 48–hour express-service capabilities are also available for this material.

 

To receive a quote for windows, substrates, or wafer components of original SCHOTT D 263 T or D 263 T eco* borosilicate glass with individual dimensions, please click the button below or select a thickness from the table.

 

Request for Quotation

 

*The D263 T eco materials have been made by SCHOTT using eco-friendly refining agents.

 

Specifications

Transmission at 0.15 mm thickness

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Transmission at 0.7 mm thickness

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UV-Transmission at 0.7 mm thickness

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Standard Thicknesses

Please click on glass thickness to request a quote.

Thickness (mm)	Tolerance
0.030	±0.008	—
0.050	±0.010	—
0.100	±0.015	✔
0.145	±0.015	✔
0.175	±0.015	✔
0.210	±0.020	✔
0.300	±0.020	✔
0.400	±0.020	✔
0.550	±0.050	✔
0.550	±0.015	✔
0.700	±0.050	✔
1.100	±0.050	✔
1.100	±0.030	✔
The thicknesses marked with "✔" are also available within 48–hour express service.
The thicknesses 0.070, 0.50 and 0.90 mm are sometimes available. If required, please send us a corresponding request.

Optical Properties

• Abbe number: v_e = 55

Refractive index numbers
Designation	Wavelength (nm)	Refractive Index
ng	436	1.5354
nF'	480	1.5305
nF	486	1.5300
ne	546	1.5255
nd	587.5	1.5231
nD	589.3	1.5230
nC'	644	1.5209
nC	656	1.5204

Mechanical Properties

• Density: 2.51 g/cm³
• Young's modulus E: 72.9 kN/mm²
• Poisson's ratio μ: 0.208
• Torsion modulus G: 30.1 kN/mm²
• Knoop hardness HK₁₀₀: 590

Thermal Properties

• Coefficient of mean linear thermal expansion
  (static measurement): 7.2 × 10^-6/K (20–300 °C)
  
• Viscosities:
  • Working Point (10⁴ dPa): 1051 °C
  • Softening Point (10^7.6 dPa): 736 °C
  • Annealing Point (10¹³ dPa): 557 °C
  • Strain Point (10^14.5 dPa): 529 °C
• Transformation temperature Tg: 557 °C
• Mean specific heat capacity (20–100 °C):
  0.82 J/(g × K)

Chemical Capabilities

• Hydrolytic resistance according to DIN ISO 719:
  • Hydrolytic Class HGB 1
  • Equivalent of alkali (Na₂O) per g of glass grains: 20 μg/g
• Acid resistance according to DIN 12 116:
  • Acid Class S2
  • Half surface weight loss after 6 h:
    1.4 mg/dm²
• Alkali resistance according to DIN ISO 695:
  • Alkali Class A2
  • Surface weight loss after 3 h:
    88 mg/dm²

Electrical Properties

Dielectric Constant (permittivity) εr
Frequency in GHz	0.001	1.0	2.0	5.0	24	77
	6.7	6.4	6.4	6.3	6.3	6.1

Loss Tangent tan(δ) x 10-4
Frequency in GHz	0.001	1.0	2.0	5.0	24	77
	61	74	81	101	210	240

• Specific AC-Volume Resistivity ρ_D (Ω x cm):
  • 1.6 × 10⁸ (250 °C / 50 Hz)
  • 3.5 × 10⁶ (350 °C / 50 Hz)

Other materials from SCHOTT in our extensive delivery program are AF 32 eco, AS 87 eco, B 270 Superwite, BK7, and BOROFLOAT® 33. For further technical information, please feel free to contact us.

All data and specifications given are average guide values and are not guaranteed. Moreover, please consider the “Notes on Specifications”.

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Last update: November 27, 2024