Apollo Coolplus Heavy Duty Radiator Coolant is a high-quality, long-life engine coolant that is especially designed to provide comprehensive corrosion protection for a wide range of metals commonly found in engine cooling systems also including brass, copper, steel, cast iron, and aluminum, while also offering excellent thermal stability. Also, it features include its "NAP-free" formulation with elevated levels of borates and silicates, that ensure an effective corrosion inhibition without the use of nitrates, phosphates, and amines, and a green color for identification