
Pneuflex is also making Porous Polyethylene (HDPE) Filter / Silencer. The filter size is ranging from 10-60μm.
PSE - Porous HDPE filter has the advantages of light weight and high accurate filter size.
https://www.wellfittings.com/pneumatic-mufflers-silencers-filters/pse-porous-plastic-silencer/