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