A thermal insulation product includes a mineral wool, the mineral wool including mineral fibers, the fibers having a fiber length population distribution such that the median fiber length by number of the distribution is less than or equal to 2 mm, and that at least 10% of the number population has a fiber length strictly greater than 1.5 mm and, the product including at least one additive, the product having a weight percent of the total of the at least one additive of between 0.4% and 1.2% inclusive.

An apparatus for manufacturing mineral wool includes means for producing molten mineral material, and a fiberizing device for forming fibers, into which fiberizing device the molten mineral material is fed and by which fibers are formed. The fiberizing device has, rotationally arranged around a vertical axis, at least one fiberizing plate with a vertical peripheral edge, into which are formed numerous small-sized holes, through which the molten material is led by centrifugal force to form fibers. Into the fiberizing device are arranged elements to produce a vertical flow of blowing medium to be led around the fiberizing plate, the flow causing the fibers to turn downwards and, at the same time, to thin. Downstream the fiberizing device is arranged a collection device, into which the formed fibers are led and collected into a mat-like material. In connection with said at least one fiberizing plate is arranged a substantially horizontal, relatively narrow channel, through which the fibers are brought into the chamber space of the collection device. A method for manufacturing mineral wool and a mineral wool product manufactured by the method are also disclosed.

An apparatus for and a method of manufacturing mineral wool are disclosed, wherein multiple fiberizing devices form discrete groups of mineral wool fibers that are separately conveyed to a common collection device. When the groups of mineral wool fibers are conveyed through separate channels, the channels can differ by shape and/or size, as well as location relative to the collection device.