Cavity Charges

5-lb. RDX/TNT Cavity Demolition Charge Mk I: This charge is a linear cavity char-ge designed for cutting chain, steel wire rope, steel plate, etc. The charge consists of approximately five lb. of 60/40 RDX/TNT. The primer pocket will accept either a C.E. Pri-mer Mk I, II, or III, or a 2-oz. Polar Blasting Gelatine Primer. The charge has been desig-ned for use with Briska Detonators No. 6, and is not suitable for use with Detonator No. 21 or No. 25. An I.C.I. Gasless Delay Detonator No. 1 may be used when the charge is fitted with a C.E. Primer Mk III.

The thin sheet-steel case encloses the watertight cavity. The case and pimer-tube bung are watertight, allowing the charge to be used in depths up to three fathmos. Two cleats and 6-ft. lanyards attached to the charge enable it to be quickly secured to its target.