Abstract: The outside surfaces of a ski are made by treating a fibrous material with a compound based on phenolic resin and containing 60 to 80 mass percent of dry matter, said phenolic resin being curable at 100.degree. to 120.degree. C., whereupon the thus-treated fibrous material is allowed to stand at 70.degree. to 90.degree. C. for a period of time long enough for said phenolic resin to partially polycondense, whereupon said material is applied to the ski blank and the resultant intermediate product is exposed to the effect of a temperature ranging within 100.degree. and 120.degree. C. and a pressure ranging within 0.5 and 2.0 MPa for complete polycondensation of said phenolic resin to occur and for said fibrous material to firmly adhere to the ski blank at the same time.

Abstract: A heat-insulating material comprising from 85 to 98 parts by weight of mineral wool and from 15 to 2 parts by weight of a binder applied onto the wool, which is a modified resol phenol-formaldehyde resin on the basis of phenol, formaldehyde, sodium hydroxide, a water proofing additive which is an individual alkylresorcinol with a number of side chain carbons of 2 to 8 or a mixture of alkylresorcinols, as well as urea, or dicyandiamide, or melamine, the ratio between said components being as follows (parts by weight):______________________________________ phenol 1 formaldehyde 0.74-0.96 sodium hydroxide 0.03-0.05 alkylresorcinol with a number of side chain carbons of 2 to 8, or a mixture of alkylresorcinols 0.075-0.45 urea, or dicyandimaide, or melamine 0.15-0.35 ______________________________________The proposed heat-insulating material features improved adhesion properties, has a reduced water absorption and an increased moisture resistance.