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Alkali-free glass
Alkali-Free Glass Substrates
Alkali-free glass (also referred to as non-alkali glass or zero-alkali glass) is an advanced aluminosilicate optical glass manufactured without alkali metal ions (such as Na⁺ or K⁺), engineered to prevent alkali ion migration during thermal processing and thin-film coating deposition.
Functions:
Offers exceptional surface flatness, high thermal deformation resistance, low coefficient of thermal expansion (CTE), and superior chemical stability. Eliminates contamination risks in semiconductor and thin-film processing while delivering high broadband light transmittance.
Applications:
Semiconductor wafer-level packaging substrates
CMOS/CCD image sensor covers
OLED/TFT-LCD display panels
Optical filter coating substrates
Precision micro-optics
High-temperature optical viewports
#Information and Notes
ITEM NO:IRICO0.4
Spectral Characteristics
Tave>92% @ 400-1100nm
Physical Characteristics
Thickness: 0.4mm
Square: 3x3 - 550x650mm
Round: Dia3 - 300mm
Resistant Temperature
450℃
ITEM NO:IRICO0.5
Spectral Characteristics
Tave>92% @ 400-1100nm
Physical Characteristics
Thickness: 0.5mm
Square: 3x3 - 550x650mm
Round: Dia3 - 300mm
Resistant Temperature
450℃
ITEM NO:IRICO0.7
Spectral Characteristics
Tave>92% @ 400-1100nm
Physical Characteristics
Thickness: 0.7mm
Square: 3x3 - 550x650mm
Round: Dia3 - 300mm
Resistant Temperature
450℃
Information and Notes
1. Premium alkali-free glass offers higher optical transmittance and a significantly lower coefficient of thermal expansion (CTE) compared to standard commercial glass, providing superior thermal resistance against high-temperature processing.
2. Custom geometrical profiles, non-standard thicknesses, CNC edge grinding, and precision drilling are available to meet OEM integration requirements.
3. Spectral transmittance curves represent measurements at normal incidence (0° angle of incidence). Non-transmitted light within the spectrum is absorbed by the physical optical properties of the glass substrate.
4. For applications requiring maximized light throughput, please refer to our Anti-Reflective (AR) Coating Solutions.
5. Please note that alkali-free glass cannot be chemically strengthened due to the absence of alkali metal ions required for ion-exchange processing.
6. Website specifications are provided for reference only. Final production and delivery comply with mutually agreed engineering specifications.
