Instant flour is low-protein flour that has been "pregelatanized" so that it can dissolve quickly and smoothly in liquids, regardless of temperature.
Instant Flour is granular and formulated to dissolve quickly in hot or cold liquids.
Instant Flour is mainly used for thickening savoury sauces. It is designed to dissolve instantly in liquids, whether hot or cold.
Very low-protein wheat flour is used in making it (about 2% protein), along with a small amount of malted barley flour. To manufacture it, the flour is first extrusion-cooked by mechanically treating it with high heat at high pressure, then suddenly returned to normal pressure, at which point the water in the product spontaneously vaporises. Then it is dried, and ground to a granular consistency like that of salt.
Some people also use it as a cake or pastry flour. Some people like using it to make batters with, though many people have had it turn their batters grainy. Some people like to use it for dredging and coating.
Most though would consider Instant Flour far too expensive to be using for something that plain old flour would do far better. But a canister of it in the cupboard is handy for rescuing gravies and sauces at the last minute.
Cooking Tips: Do not sift before measuring.