A water-tight fiber optic ribbon communications cable constructed without the use of gel or grease in the buffer tube thereof. The composition includes a hydrophilic polymer, at least one nonionic surfactant, at least one solvent, an acid and water, wherein the acid provides the composition with a pH of about 2 to 3. At least one base module comprises at least one module support profile, in addition to lateral walls and front-sided insertion elements.