Micro-droplet　generation　for　solid　particle　suspensions　is　studied　experimentally　over　a　wide　range　of　volume　fraction　of　solid　(η),　using　a　home　build　pneumatic　ejection　system.　Ejection　is　actuated　by　a　solenoid　valve,　setting　to　＇conduction＇　state　for　short　period　of　time　Δt.　Pressurized　gas　of　Po　enters　the　reservoir,　creating　a　pressure　pulse　P(t),　forcing　the　liquid　out　via　a　tiny　nozzle　to　produce　a　micro-droplet.　Here,　P(t)　is　measured　by　a　high-speed　sensor,　and　the　ejection　process　is　examined　by　high　speed　photography　and　image　processing.　Single　droplet　can　be　ejected　for　suspensions　with　η　up　to　33%.　For　η　less　than　about　18%,　the　required　pressure　amplitude　increases　roughly　linearly　with　η.　With　η　increased　above　18%,　the　demand　for　pressure　amplitude　is　significantly　higher　than　the　linearly　increasing　trend.　Especially　as　η　is　increased　above　24%,　the　liquid　band　stretches　much　longer,　and　the　break-up　is　delayed　drastically.　©　2021　IEEE.