In quarries, hard rock blasting is done effectively using explosives for civil use. Perhaps, the most used technical solution for decreasing the seismic effects due to blasting is sequential blasting in front of the quarry. This technical solution involves the use of proper means of initiating explosives, which have to meet certain characteristics able of leading to the achievement of the intended purpose. This paper describes one of the methods of verification and the testing results for non-electric initiation system components, usually used to initiate the explosives in quarries, in terms of “delay accuracy”, which is an essential parameter for highlighting the possibility of using these products within blasting schemes.