Related by context. Frequent words. (Click for all words.) 64 permeable 57 impervious 53 absorbent 53 porous 53 impenetrable 51 breathable 48 insulating 48 hermetically sealed 47 membrane 47 insulated 46 airtight 45 thin layer 45 outer layer 45 permeability 45 waterproof 44 membranes 44 layer 44 hydrophobic 44 outer shell 43 coating 43 polymeric 43 insoluble 43 mesh 43 resistant 43 wire mesh 43 encased 42 impregnable 42 watertight 42 seep 42 fibrous 42 compacted 42 tightly woven 42 sealant 42 sterile 41 biofilm 41 PTFE 41 reinforced concrete 41 thick layer 41 protective 41 corrosive 41 perforated 41 layers 41 enclosed 40 Teflon 40 hydrophilic 40 encapsulation 40 waterproofing 40 repellent 39 repellant 39 multilayer 39 crevices 39 outer 39 cheesecloth 39 adhesive 39 inert 39 rubberized 39 acidic 39 polyurethane 39 biocompatible 39 homogeneous 39 aqueous 39 surface 38 elastic 38 conductive 38 encasing 38 polymer 38 burlap 38 weatherproof 38 eggshell 38 encase 38 washable 38 walled 38 sieve 38 indestructible 38 translucent 38 tamper resistant 38 walls 38 dense 38 hydrogel 38 fit snugly 38 polyethylene 37 foams 37 silicate 37 seeping 37 corrosion resistant 37 oxidizing 37 layered 37 polypropylene 37 silica 37 thermoplastic 37 pliable 37 sidewalls 37 airless 37 annulus 37 colorless 37 spongy 37 perforations 37 encloses 37 silicone 37 grout 36 millimeters thick