Hi John,

I don't think Zemax has any material on black polyacetal in general. I don't know if you've had a chance to peruse our knowledgebase articles on scattering in general, though, so I'm going to post some links here that hopefully will be useful.

A good starting point for you or anyone interested is 'What scattering models are available in OpticStudio', at https://my.zemax.com/en-US/Knowledge-Base/kb-article/?ka=KA-01415. It provides a good starting overview for surface and bulk scattering. More detail for bulk if you are interested in the Henyey-Greenstein or Rayleigh models can be found in 'Using the Henyey-Greenstein distribution to model bulk scattering' at https://my.zemax.com/en-US/Knowledge-Base/kb-article/?ka=KA-01685 and 'Bulk scattering with the Rayleigh model' at https://my.zemax.com/en-US/Knowledge-Base/kb-article/?ka=KA-01454 respectively. A good starting point for surface scatter would be 'How to use tabular BSDF data to define the surface scattering distribution' at https://my.zemax.com/en-US/Knowledge-Base/kb-article/?ka=KA-01520, but many more exist.