The Model ESFR-25 pendent sprinklers are “Early Suppression, Fast Response sprinklers” having a nominal K-Factor of 25.2. (363). They are suppression-mode sprinklers that are especially advantageous as a means of eliminating the use of in-rack sprinklers when protecting high-piled storage. The Model ESFR-25 sprinklers are primarily used for ceiling-only sprinkler protection of (but not limited to) the following storage applications: • Most encapsulated or non-encapsulated common materials including cartoned, unexpanded plastics. • Uncartoned (exposed) expanded plastics in accordance with NFPA 13 and FM Global standards. • Some storage arrangements of rubber tires, roll paper, flammable liquids, aerosols, and automotive components.