The present invention relates to obtaining an antimicrobial joint sealant obtained by adding boron compounds therein. The surfaces of all kinds of raw materials and semi finished products produced from the joint sealant material of the present invention are protected against microbial contamination and degradation, corrosion and decay. In the invention wherein sodium borate ((Na2O)(B2O3)5.10H2O), zinc borate (2ZnO.3B2O3.3.5H2O) and potassium borate (K2B4O7.4H2O) are used as boron derivatives it is determined that Escherichia coli, Staphylococcus aureus, Pseudomonas aeruginosa, Botrytis spp., Aspergillus spp., Penicillium spp., Fusarium spp., Alternaria spp., Penicillium spp., and Candida spp. can be controlled by means of the said materials added to the joint sealant.
