Personal Protective Equipment and Self-Contained Breathing Apparatus No. 1 Questions taken from Jones & Bartlett Fundamentals of Fire Fighter Skills (3rd Edition) Progress Indicator: Question 2 of 23 2.  The ability of an explosive material to retain chemical and physical properties specified by the manufacturer when exposed to specific environmental conditions over a particular period of time. Choices: Series in Parallel Blasting Circuit Quantity-distance Silver Chloride Cell Stability