Fiber board product comprising a calcium carbonate-containing material

A fiber board product comprising

• a) fibers in an amount from 50.0 to 99.0 parts by weight (d/d), based on the total dry weight of the fibers and at least one particulate calcium carbonate-containing material, wherein the fibers in an amount of
• i) 0 to 20.0 wt.-%, based on the total amount of dry fibers, are of a size which is fractioned at a mesh sieve width of 0.05 mm,
• ii) 50.0 to 90.0 wt.-%, based on the total amount of dry fibers, are of a size which is fractioned at a mesh sieve width of 1.0 mm, and
• iii) 70.0 to 100.0 wt.-%, based on the total amount of dry fibers, are of a size which is fractioned at a mesh sieve width of 3.0 mm, as determined by sieve analysis,
• b) at least one particulate calcium carbonate-containing material in an amount from 1.0 to 50.0 parts by weight (d/d), based on the total dry weight of the fibers and the at least one particulate calcium carbonate-containing material, the at least one particulate calcium carbonate-containing material having a weight median particle size d50 of 0.5 to 150.0 μm,
• c) at least one binder in an amount from 0.05 to 25.0 parts by weight (d/d), based on the total dry weight of the fibers and the at least one particulate calcium carbonate-containing material, and
• d) at least one wax in an amount from 0 to 5.0 parts by weight (d/d), based on the total dry weight of the fibers and the at least one particulate calcium carbonate-containing material,
• wherein the sum of the amount of the fibers and the at least one particulate calcium carbonate-containing material is 100.0 parts by weight (d/d), based on the total dry weight of the fibers and the at least one particulate calcium carbonate-containing material.