A processor includes controller circuitry operative to control the storage of a plurality of separate linked list data structures for protocol data units received by the processor. The intumescent ceramic binder comprises a mixture of a liquid alkali metal silicate, mineral fibers and a wetting agent. The electrodes 5 are contained in the inner space 6. The end caps have at least one annular lock ring which is forcibly engaged with the terminal annular lock edge of the retaining ring so as to join the end cap, and thus said filter cartridge, to the end plates. Da MDbD\u2032cD\u2033dM MeTf MgQh wherein a is 3-6b is 1-1,000,000, preferably 1-50,000, more preferably 1-5,000c is 0-1,000,000, preferably 0-50,000, more preferably 0-5,000d is 0-1,000,000, preferably 0-50,000, more preferably 0-5,000e is 1-1,000f is 1-1,000g is 1-1,000; andh is 1-1,000.