Safety Fuse type PL10 – PL8 – PL6 – PL5. The Safety Fuse, also cut into Delay Fuses and Pyro Delays. Safety Fuses represent essential tools which can be used in the pyrotechnic industry, whether for the mining and for a wide variety of military and civil applications. Precise combustion allows Firing Delays to be regulated to tenths of a second. PYROCLOCK® has already become a standard and an easy-to-use tool which applies the advantages of Safety Fuse to the timing of pyrotechnical chains.