TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Components: The trimerization catalyst is a salt of a tertiary amine comprising triethylamine, tripropylamine, tributylamine, dimethylcyclohexylamine, dimethylbenzylamine, dibutylcyelohexylamine, dimethyleihanolamine, triethanolamine, diethylethanolamine, ethyldiethanolamine, dimethylisopropanolamine, triisopropanolamine, triethylenediamine, tetramethyl-l,3-butanediamine, N,N,N',N'-tetramethylethylenediamine, N,N,N',N'-tetramethylhexanediamine-1,6,N,N, N, N', N''-pentamethyldiethylenetriamine, bis(2-dimethylaminoethoxy)methane, N,N,N'-trimethyl-N-(2-hydroxyethyl)-ethylcndiamine, N,N-dimethyl-N',N'-(2-hydroxyethyl)-ethylenediamine, telramethylguanidine, N-methylpiperidine, N-ethylpiperidine, N-methyl morpholine, N-ethyl morpholine, 1,4-dimethyl piperidine, 1,2,4-trimethyl piperidine, N-(2-dimethylaminoethy-morpholine, l-methyI-4-(2-dimethylamino)-piperidine, 1,4-diazabicyclo(2.2.2)octane, l,8-diazabicyclo(5.4.0)undec-7-ene or l,5-diazabicyclo(4.3.0)-5-nonane. The salt comprises phenolate, ethylhexanoates, oleates, acetate or formates. The molded body core has a water content of greater than or equal to 0.5 wt.% to less than or equal to 30 wt.%. An additional fiber and/or textile surface element are arranged on the molded body core. The negative pressure (p1) is greater than or equal to 0.1 mbar to less than or equal to 500 mbar. Preferred Method: The additional fiber and/or textile surface element is contacted with the polyurethane/polyisocyanurate reaction mixture. The method is carried out inside a closed mold. The positive pressure (p2) is applied through a flexible container, and the fluid is introduced into the flexible container, where a solid body is arranged in the interior of the flexible container.    TECHNOLOGY FOCUS - POLYMERS - Preferred Components: The molar ratio of isocyanate groups to hydroxy groups in the polyurethane/polyisocyanurate reaction mixture is 1.6-6. The polyurethane/polyisocyanurate reaction mixture comprises a latent reactive trimerization catalyst. EXAMPLE - Polyol mixture comprised of 100 wt.% glycerin-initiated polypropylene oxide and 2 wt.% Polycat SA 1/10 (RTM: Phenol salt of 1,8-diazabicyclo(5.4.0)undec-7-ene in dipropylene glycol) was degassed at a pressure of 1 mbar for 60 minutes and then added to the isocyanate mixture comprised of 51 wt.% diphenylmethane-4,4'-diisocyanate, 30 wt.% diphenylmethane-2,4'-diisocyanate, 6 wt.% diphenylmethane-2,2'-diisocyanate and 13 wt.% higher functional homologues of methylene diphenyl diisocyanate. The resulting mixture was degassed for 5 minutes at a pressure of 1 mbar and then molded into plate shape. The plates were molded at room temperature and heated overnight in a heated drying cabinet at 80 degrees C.