Rich,

To start with, look at these articles:

https://wp.optics.arizona.edu/optomech/wp-content/uploads/sites/53/2016/10/Black-Coatings-to-Reduce-Stray-Light.pdf

https://wp.optics.arizona.edu/optomech/wp-content/uploads/sites/53/2016/10/persky-1999.pdf

https://e-reports-ext.llnl.gov/pdf/361993.pdf

Here's a provider that specializes in black coatings
https://www.acktar.com/

I used 3M ECP-2220 Solar Absorber Coating.  I bought a gallon of it in 1988 to use in the design of a spectrofluorometer.  The resulting stray light in the monochromator compartment was VERY low and easy to apply.

Unfortunately I looked but haven't been able to find it on the web (it was listed on the second reference paper I listed in the Review of Scientific Instruments).

Regards,

Bob Landman
H&L Instruments, LLC


-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Richard Kraszewski
Sent: Friday, November 30, 2018 2:59 PM
To: [log in to unmask]
Subject: [TN] Need for an Light -Blocking Coating

Can anyone recommend a good light blocking coating?
I need to  block all light from several sides of a component body.

Thanks in advance

Rich  Kraszewski 
Senior Staff Process Engineer