摘要: The development of rigidity in adhesive solutions, viz. gelatin, casein, urea-formaldehyde, resorcinalformaldehyde and tannin formaldehyde, was followed with the help theSaunders andWard apparatus. shape curves shows that differs type adhesive. influence temperatures also studied ureaformaldehyde, „gelation time“ is almost halved for every 5°C rise temperature. Finally compressive strength set gels reported.