I've had post 1997 Thomas Glover cartridge foams shoot the short plastic lance/nozzle off like rubber bullets before.
The loss of the lance actually in part is just us catching up with the US who dumped lances on Wet Chemical several years ago (NFPA 10: Standard for Portable Fire Extinguishers, 2002 Edition) after there was a concern that an operator could walk up to an involved deep fat fryer, and submerge the wand below the liquid surface prior to initiating discharge. Such an action (referred in some publications and presentations as subsurface injection) would cause the water content of the wet
chemical solution to convert to steam, expanding its volume at a ratio of 1750:1 instantly, resulting in an explosion of the burning grease.
Also with a wider use of ABF Foams and small sizes (2 litre, 600ml, etc) the need for a traditional spray nozzle to accomodate Class B use.
Finally it's cheaper - the same cylinder, valve, hose & nozzle can be used for 6 litre water, water additive, foam and Wet Chemical, just use a different screen print and fill!
Ex-celsuis stuff is comes from here
http://www.winnerfire.com.cn/english/about.aspOddly despite owning several extinguisher manufacturers TYCO are a big user.
Delta (if it is the Delta Fire I am thinking of) have used Firex (now called FireFly) extinguishers for years & briefly before that an unkown Italian brand