As an explosion flame travels through a narrow metal space, heat is transmitted to the walls, energy is lost and only vapor gasses are able to pass through, At the heart of each Cashco flame arrestor, lies filter discs that consists of smooth and channeled strips of stainless steel set at specific maximum experimental gaps. The smaller the gaps at which the flame travels, the more heat and energy is lost. Therefore, the filter’s gap width and length are specifically engineered to match the explosive mixture, in order to ensure complete extinction of the flame.