Select Page

SCHOTT Borofloat® 33 Borosilicate Float Glass

BOROFLOAT® 33 is a UV-NIR transparent borosilicate float glass with excellent optical properties and smooth low scatter surfaces straight off the float process. It is an economical high performance material, making it ideal for the volume manufacture of windows, mirrors, filters, display glass, 3D build platforms, and other components. BOROFLOAT® 33’s composition lends itself to outstanding thermal resistance and sharp impact crack resistance, making it an excellent choice for challenging use environments. Abrisa Technologies offers a wide selection of glass, custom fabrication, heat toughening, optical coating, electrical connectivity, screen printing, applied films, oleophobics, laser marking, and more for a Total Solution.

Official Borofloat® Distributor

Features

  • Optical Quality Borosilicate Glass
  • High Transparency/Color Neutral
  • Broad Spectral Range UV-VIS-NIR
  • High Thermal Resistance (Shock & Gradient)
  • Crack Resistant to Sharp Impact
  • Low Thermal Expansion for Tight Seals

Applications

High Performance Optical Windows
Medical Imaging & Lighting
Outdoor Image Sensing
Specialty Display Glass
High Intensity Lighting
3D Additive Manufacturing
  • Outdoor VIS-NIR Image Sensing
  • “True Color” Medical Imaging
  • High Intensity Lighting & Curing Filters
  • Heated 3D Additive Build Platforms
  • Industrial Sight Glass View Ports
  • Specialty Ruggedized Displays

Soda-Lime vs. SCHOTT Borofloat® 33 Sharp Impact Crack Resistance

Soda-Lime Sharp Impact Crack Resistance
SCHOTT Borofloat® Sharp Impact Crack Resistance

Optical Properties

  • Broad spectral range UV-VIS-NIR
  • High Transparency/Color Neutral
  • Excellent for Imaging/Sensing, Specialty Lighting
Dispersion - Refractive Index Curve Graph
Transmittance to Thickness Graph

Mechanical Properties

  • Sharp Impact Crack Resistant
  • Scratch Resistant
  • Abrasion Resistant
Density ƿ (25°C)
2.23 g/cm3
Modulus E (according to DIN 13316)
64 kN/mm2
Poisson's Ration μ (according to DIN 13316)
0.2
Knoop Hardness HK0.1/20 (according to DIN ISO 9385)
480

Thermal Properties

  • Thermal Shock Resistant
  • Thermal Gradient Resistant
  • High Melting Point
Max. Operating Temperatures
Max. Operating Temperatures
Short Term Usage (< 10h)
500° C
Long Term Usage (> 10h)
450° C

Resistance to Thermal Gradients (RTG) & Resistance to Thermal Shock (RTS) must be considered when determining max. operating temperatures.

Coefficient of Linear Thermal Expansion (C.T.E.) α (20 - 300° C)
3.25 x 10-6 K-1*
Specific Heat Capacity Cp (20-100° C)
0.83 kj / (kg·K)
Thermal Conductivity ʎ (90° C)
1.2W / (m·K)

* According to ISO 7991

Standard Sheet Sizes
Thickness
1,150 x 850 mm
0.7 - 25.4 mm
1,700 x 1,300 mm
16.0 - 21.0 mm
2,300 x 1,700 mm
0.7 - 15.0 mm
Sheet Thickness
Thickness Tolerance
0.70 to 2.25 mm
± 0.05 mm
2.75 mm
± 0.10 mm
3.30 to 6.50 mm
± 0.20 mm
7.50 to 13.00 mm
± 0.30 mm
15.00 mm
± 0.40 mm

Broad UV-VIS-NIR Transmission

Broad UV-VIS-NIR Transmission Graph
All Glass Materials
Spec Sheet

Ready to start your next project?

We strive to provide the best possible solutions and take pride in our attentiveness to your requirements.

Get a Quote
Contact Us