Pulpro is a near white calcium carbonate design for use as a resin filler in pultrusion and/or in fiberglass spray up manufacturing. R.J. Marshall offers 4 distinct sizes. Pulpro 3, a three micron calcium carbonate. Pulpro 8, an eight micron calcium carbonate. Pulpro 10, a ten micron calcium carbonate and Pulpro 20, a twenty micron calcium carbonate product.