we are working on thermal batteries in that we use different powders to make pellets.But the pellet is in not uniform and not green strength.what is the suitable binder can be added to the iron powder to produce uniform in size and there is no cracks at the corners of the pellet.and it is not produce smoke at high temperatures.we applied pressure at 40 tons still we are not produce uniformity.what is the reason to not get the pellets and suggest binders to get solve our problem and also give different die designs to achieve our target.