RESUMO -Objetivou-se neste estudo avaliar a tensão superficial estática, o pH e a produção da espuma de misturas em tanque de glyphosate + chlorimuron-ethyl, associadas ou não com adjuvantes. Dois trabalhos foram realizados, sendo a primeira etapa desenvolvida em delineamento inteiramente casualizado com seis tratamentos e 20 repetições, representados por soluções dos herbicidas glyphosate (540,0 g e.a. ha ) e chlorimuron-ethyl (7,5 g ha ABSTRACT -This work aimed to evaluate static superficial tension, pH and foam production in glyphosate + chlorimuron-ethyl tank mixtures with or without adjuvants. The experiment consisted of two stages, with the first stage being arranged in a complete randomized design, with six treatments and 20 replications, represented by glyphosate (540.0 g a.e. ha -1 ) and chlorimuron-ethyl (7.5 g ha -1 ) solutions, isolated and in tank mixtures in the following formulations: Polaris TM , Roundup Ready TM , Classic TM , Polaris TM + Classic TM , Roundup Ready TM + Classic TM and check (water). The second stage was also arranged in a complete randomized design, with 70 treatments and 20 replications, in a 2 x 5 x 7 factorial scheme constituted by two mixtures of glyphosate with chlorimuron-ethyl (Polaris TM + Classic TM and Roundup Ready TM + Classic TM ), 5 adjuvants (Joint Oil TM , Nimbus TM , Assist TM , Natur' Oil TM and Agr' Óleo TM ) and 7 adjuvant doses (0.000; 0.031; 0.062; 0.125; 0.250; 0.500 and 1.000% of v/v). Polaris TM and Roundup Ready TM solutions , isolated or in tank mixtures with Classic TM , characterized by static superficial tensions of 43.2 and 35.9 mN m -1 and medium