This product is a customized product. For specific dimensions, please contact the seller for customization. The price in the product details is a temporary price.

Blue cobalt glass is a special type of fire-viewing protective goggles with excellent ultraviolet and infrared protection effects. It is specifically used as a fire-viewing lens in power plants, steel mills, and cement plants.

Blue cobalt glass is produced by adding cobalt blue during the glass manufacturing process. The addition of cobalt blue gives the glass its distinctive deep blue color and excellent light-filtering properties.

Composition of blue cobalt glass:

SiO2: 75.01%; B2O3: 0.27%; CaO: 4.18%; Na2O: 15.94%; K2O: 1.19%; CoO: 0.51%; Fe2O3: 2.9%

Function of blue cobalt glass:

When observing the flame test for potassium, it is necessary to view it through blue cobalt glass because potassium compounds are often impure and mixed with impurities such as Na+ (which is difficult to separate). During the flame test, Na+ burns with a yellow color, which interferes with the observation of K+’s flame color (purple). Therefore, the yellow light must be filtered out. According to the principle of complementary colors, yellow and blue are complementary colors. Using blue cobalt glass filters out the yellow light, allowing a clear view of potassium’s flame color—purple!

In industry, blue cobalt glass is widely used as protective goggle lenses in steel mills, cement plants, and other high-temperature kilns. It is an excellent protective glass that strongly absorbs infrared and ultraviolet rays, particularly completely absorbing ultraviolet light in the 250–320 nm wavelength range, which is harmful to human eyes. The glass has a deep cobalt blue color.

Specifications and dimensions of blue cobalt glass:

Common specifications include 50*50, 50*107, 50*100, and 100*200, with a maximum size of 800*500.

The thickness is generally 2.5 mm or 2.7 mm. Custom orders are required for special thicknesses of 4–6 mm.

Blue cobalt glass is specifically used as a viewing glass for rotary kilns in cement plants, helping to accurately determine the temperature of materials inside the cement rotary kiln.

Blue cobalt glass is also an excellent steelmaking lens, commonly used as protective eyewear in steel mills.

It is also an ideal fire-viewing glass for boilers, providing eye protection while allowing clear observation of the flame size in the boiler furnace.

Blue cobalt glass is a special type of fire-viewing lens. The appearance quality of the glass may not be exceptionally high, which is normal. This type of glass prioritizes fire-viewing performance. Due to the nature of the material, light blue glass may have minor surface pits and internal bubbles, while darker blue glass generally has better appearance quality.

Guangzhou Nuokunda Glass Factory is a professional manufacturer of blue cobalt glass. We not only supply glass sheets but also offer finished goggles. Customers in need are welcome to contact us. Bulk orders enjoy preferential prices.

Hotline: 15818856507 (Mr. Luo)

Glass produced by Nuokunda Special Glass Factory is widely used in various fields, including aerospace, chemical industry, criminal investigation, medical instruments, optical communication, environmental detection, photoelectric detection, photography, laser instruments, projection scanning, corrosion-resistant windows, pressure-resistant windows, high-temperature windows, panel glass, fireplace glass, oil mines, and chemical experiments.

Special Glass:

Bulletproof glass, one-way mirror glass, explosion-proof/anti-riot/shatterproof glass, extra-long glass (up to 24 meters)...

Optical Glass:

Laser protection panels, filters, infrared-transmitting glass, ultraviolet-transmitting glass, UV-blocking glass, IR-blocking glass, etc.

Industrial Glass:

High-temperature/high-pressure resistant glass:

300°C/500°C/800°C/1200°C/1700°C

1–80 MPa

Special Categories:

Viewing window glass, fireplace glass, oven glass, step glass, electronic-grade glass, astronomical telescope glass, panel glass, etc.

Glass Substrates:

Tempered glass, quartz, high borosilicate, high alumina silicate glass, zirconium-yttrium-lanthanum glass, soda-lime glass, sapphire, K9, Schott BF33, microcrystalline, D263T, B270, BK7, Corning series, zinc selenide, silicon, calcium fluoride, magnesium fluoride, ultra-clear, AG, AR, etc.

Other Products:

Silicone-free adhesive, high-temperature adhesive, American Forest paint, graphite, ceramics, etc.

Hotline: 15818856507 (Mr. Luo)