Lead mononitroresorcinate LMNR

Lead mononitroresorcinate (LMNR) fusehead initiating substance... 

Primary explosives have a high degree of sensitivity to initiation through shock, friction, electric spark or high temperatures and explode whether they are confined or unconfined. Typical primary explosives which are widely used are lead azide, lead styphnate (trinitroresorci-nate), lead mononitroresorcinate (LMNR), potassium dinitrobenzo-furozan (KDNBF) and barium styphnate. Other primary explosive materials which are not frequently used today are mercury azide and mercury fulminate. 

Shock initiation of lead azide by an electron beam has been compared with that of potassium dinitrobenzofuroxan (KDNBF), lead styphnate, and lead mononitroresorcinate (LMNR) [49], An aluminum slab was heated rapidly by electron deposition, generating a pressure pulse that propagated through the slab and was transmitted to a specimen bonded to its rear. The mean energy of the electrons was in the range of 900 keV and produced a stress pulse in the aluminum with a duration of approximately 0.2 psec. 

Three important expls BkPdr (Black Powder) LSt (Lead Styphnate) and LMNR (Lead Mononitroresorcinate) were considered indeterminate without additional testing... 

Figure 1 shows Jones results (Ref 3) of his study of critical firing energies for electric fuse-heads (also known as matchheads). The data in Fig 1 are for an 80/20 LMNR/KC103 ignition mixture (LMNR is Lead Mononitroresorcinate). 

Anon, Atlas/Aerospace No 8, 1969, Atlas Chemical Ind, Valley Forge, Pa 19481 reviewed by G. Cohn, Edit in Expls Pyrots 3(3), 1970 under the title Explosives for Actuators [LMNR (Lead Mononitroresorcinate), KDNBF (Potassium Dinitrobenzofuroxane) and BaSt (Barium Styphnate) are the three common materials used as either ignition drops or base charges in actuators, motors, switches, and matches. LMNR, a stable, low-cost compd, is always used with 5 to 40% KCIO3. KDNBF, a higher cost material, is 5 to 10 times more powerful than LMNR. 

There are also electric squibs which.are used for military purpose. One such device is the US Navy All-Purpose Mkl Electric Squib", shown as Fig E21. It comprises a gilding metal or A1 case (3), contg Pt-Ir bridge wire (4), surrounded by the ignition bead (5), winch may be LSt(Lead Styphnate), LA(Lead Azide) or LMNR(Lead Mononitroresorcinate) + KC103 (95/5). The bridge is connected to two leg wires (l), which pass thru a phenolic plug (2). 

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