My mill has the cutter fully surrounded by a vacuum manifold, and the vacuum itself is bag and HEPA filtered. The compressed paper PCBs have horrible propertie

My mill has the cutter fully surrounded by a vacuum manifold, and the vacuum itself is bag and HEPA filtered. The compressed paper PCBs have horrible properties. The RF laminated all have specific properties for electrical performance; dielectric constant, low loss tangent, low surface roughness, homogeneity, controller thermal expansion, thermal conductivity.