Mo-Sci has taken two distinct approaches to developing high-temperature sealant materials for solid oxide fuel cells (SOFCs) and other applications such as sodium-ion batteries. The first is the traditional glass-ceramic seal in which the glass crystallizes and bonds to seal components.

The second approach bonds to metals and ceramics, but the alkali-free composition of the glass has been tailored to operate in a viscous state while resisting crystallization. Compliant or viscous glass seals are a new class of SOFC seal and are designed to be vitreous at the SOFC stack operating temperatures. Viscous seals have the potential to reduce the risk that thermal stresses will result in catastrophic seal failure through viscous healing of cracks if they form during thermal cycling.

Download the Sealing Glass information sheet: Sealing Glass Info Sheet

Learn about the different types of sealing glass and the key parameters to consider when selecting a sealing glass for your application.

Mo-Sci Sealing Glass Selector

wdt_ID Glass Data Sheet Glass Seal Type Applicable Materials Max Operational Temp (°C) Min Firing Temp (°C) Max Firing Temp (°C) CTE Crystalized (ppm/°C) CTE As Cast (ppm/°C) Tc (°C) Td (°C) Tg (°C) Density (g/cm3) Resistant to Alkali Color
32 GL1701 Data Sheet glass-ceramic Alumina, Aluminum Nitride, Mullite, Sapphire, Steatite, Yttria 1,600 1,200 6.00 1,000 1,200 750 2.60 No white
33 GL1702 Data Sheet glass-ceramic Alumina, Yttria, Sapphire, Steatite 1,200 900 1,200 8.00 7.90 880 697 670 3.50 No white
34 GL1862 Data Sheet glass-ceramic Alloy 52, Ferrite, Forsterite, Stainless Steel 4XX, Titanium, YSZ, Zirconia 1,000 850 925 10.30 10.00 1,028 762 725 3.40 No white
35 GL1873 Data Sheet glass-ceramic Alumina, Yttria, Sapphire, Steatite 1,000 800 820 7.60 8.30 827 700 651 2.60 No white
36 GL1850 Data Sheet glass-ceramic Aluminum Nitride, Mullite, Silicon Carbide, Silicon Nitride, Tungsten 970 1,250 1,250 3.50 3.90 1,250 849 815 2.40 No white
37 GL1870 Data Sheet glass-ceramic Alumina, Yttria, Sapphire, Steatite 910 1,020 1,020 9.10 9.60 1,037 754 724 3.20 No white
38 GL1883 Data Sheet glass Aluminum Nitride, Mullite, Silicon Carbide, Silicon Nitride, Tungsten 900 950 970 3.50 599 462 2.10 No white
39 GL1810 Data Sheet glass-ceramic Inconel Alloys, Stainless Steel 3XX, Copper 900 820 1,000 16.00 10.00 815 682 575 2.40 No white
40 GL1729 Data Sheet glass-ceramic Alloy 52, Ferrite, Forsterite, Stainless Steel 4XX, Titanium, YSZ, Zirconia 900 790 890 11.00 10.90 890 750 690 3.50 No white
41 GL1497 Data Sheet glass-ceramic Alloy 52, Ferrite, Forsterite, Stainless Steel 4XX, Titanium, YSZ, Zirconia 900 760 830 10.00 9.60 830 718 640 3.30 No brown
Glass Seal Type Applicable Materials Max Operational Temp (°C) Min Firing Temp (°C) Max Firing Temp (°C) CTE Crystalized (ppm/°C) CTE As Cast (ppm/°C) Tc (°C) Td (°C) Tg (°C) Resistant to Alkali

Note: This is an area of current research and development and additional compositions are in the commercialization process at this time. Please contact Mo-Sci about the availability of other compositions if the options above will not suit your application.

Visit our online store here for trial quantities of some of our most popular compositions.