At least a portion of the powder is mechanically attached to {TAIL ~ a surface} of the cavity, where the mechanical attachment of the powder allows {HEAD ~ a portion} of flame retardant particles of the powder to protrude beyond the surface and not be completely embedded therein 
At least a portion of the powder is mechanically attached to { TAIL ~ a surface } of the cavity , where the mechanical attachment of the powder allows { HEAD ~ a portion } of flame retardant particles of the powder to protrude beyond the surface and not be completely embedded therein
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 OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH