What kind of reflectors work at UVC wavelengths?

8/25/21 - Addendum:  NIST has just published an excellent article about testing UVC reflection of different materials at LINK in the Journal of Research of the National Institute of Standards and Technology.

• Pure metals (best reflectance is achieved with high purity thin films on glass)
• Stainless Steel Alloys (low reflectance but better than nothing)
• POREX Virtek PTFE (High scattering reflectance, formable material).  Similar to MCPET in the visible wavelengths but tougher.

For the metals cited, there are a huge variety of specific alloys, surface conditions, and test is recommended for specific materials.

Material	Reflectance (scattering)
e-PTFE	95% (highly scattering)
Aluminum Thin Film on Glass	85% (specular)
Aluminum (sheet and foils)	~70% (depends on surface finish)
Platinum Thin Film on Glass	~55% (specular)
Gold Thin Film on Glass	~40% (specular)
Rhodium Thin Film on Glass	~30% (specular)
Copper Thin Film on Glass	~30% (specular)
Stainless Steel (sheets and foils)	20-30% (depends on surface finish)
Silver Thin Film on Glass	~15% (specular)

https://www.porex.com/markets/reflective-media/

Some early experiments with commercial grades of aluminum foils and rhodium on glass mirrors

https://nvlpubs.nist.gov/nistpubs/jres/4/jresv4n2p189_A2b.pdf

NREL study on UV reflectance of thin-film metals

[8/17/22]  Add Table from Kowalski. 

https://www.nrel.gov/docs/legosti/old/4418.pdf

Luminus UVC product information is located here:  https://www.luminus.com/products/uv

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