- HYDRANSAFE HFA S7 is a premium longwall fluid meeting all the specification of the underground minining industry (CAT, JOY etc…) for roof support systems. It exibits extremely high stability when mixed with water, ensuring increased reliatbility of operations. - HYDRANSAFE HFA S7 provides extensive protection to all kinds of hydraulic system requiring water based HFA fire resistant fluids in various industries such as mining, steel, auto manufacturing etc