welcome 2018 ! Barium Sulfate ,thanks to its lead-like ability to block X-rays...

White Reflectance Coating Barium Sulphate

White Reflectance Coating Barium Sulphate (BaSO4)

• Optically stable
• High reflectance (up to 98%)
• Heat resistance up to 100°C (Labsphere´s coating)
• Applied by spraying
• Applicable on metal, plastic and glass substrates
• Sensitive to water and UV light

Sphereoptics offers Barium Sulphate coating in a different variation:

• Labsphere´s 6080 white reflectance coating, an alcohol based coating, is offered as pre- mixed or ready to go coating solution with the highest reflectivity of 98% (visible spectral range) available on the market
• Coating service of larger integration spheres with reflection values > 97%
• Water based barium sulphate coating, available also as handy and easy to use small spray kit versions
• Pure barium sulphate powder for reflectance standard of referencing

Short Description

Sphereoptics´s range of barium sulphate (BaSO4) coatings are scientific-grade paints that exhibit near-perfect diffuse reflectance at levels up to 98% in the 250-2500nm (UV-VIS-NIR) wavelength range. This coating is intended for customers with small-scale and large scale applications like integration sphere. This non-luminescent coating yields reflectance values of 95 to 98% over the wavelength region from 300 to 1200 nm.

Applications

• Coating of integration spheres
• Lamp housings
• Backlight reflectors
• Laser pumping chambers
• Any area where uniform diffuse reflectance is needed

http://sphereoptics.de/en/product/white-reflectance-coating-barium-sulphate/