The materials can be selected to have a desired size or {TAIL ~ size distribution}, and can be evenly distributed throughout the composition to provide {HEAD ~ controlled porosity} 
The materials can be selected to have a desired size or { TAIL ~ size distribution } , and can be evenly distributed throughout the composition to provide { HEAD ~ controlled porosity }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD