one another to produce a stable lofted insulation 34 free of binders and brittle components coated only with a lubricant coating the lofted material is suitable not only for thermal but also sound insulation and is also useful as a fibration material among many other potential environmentally non hazardness uses the re expansion results in the actual installed product the final bulk density can be controlled by the amount of mechanical action velocity of air coating material or coating amount the expansion takes place when the r buds are put into a mechanical action machine which via a scouring action and the use of air to blow the product takes the compacted r buds and expands them into a product that is a 3 dimensional random matrix comprising fibers in equal proportion in the x y and z directions the bulk density can range from 0 25 to 2 lbs per cubic foot standard mean fiber diameters from melt blowing operations range from 10 to 50 microns in insulation it is better to have smaller diameters but strong fibers the range of fiber diameters for insulation products will vary depending on final application specifications but can generally be characterized into 2 groups 1 to 10 micron average diameter and sub micron 0 1 to 1 micron average it has been found that for the blown in insulation product a preferred statistical mean diameter should be in the 2 to 7 micron range the term density can apply to several areas the individual fiber has a density that is.