Abstract: A hollow building element (10) of plastics material comprises one or more longitudinal ducts (30) and has at opposite sides thereof, coupling members (32, 34), whereby elements are connectable to each other directly or indirectly, wherein lower coupling members (34A, 34B) comprise ducted flanges (42, 50 respectively). Building structures comprise such hollow building elements (10) coupled side by side.

Abstract: Chlorhexidine gluconate-containing adhesives have dispersed therein solid chlorhexidiene particles which will pass through a 125 .mu.m sieve and at least about 30% of the total volume of particles has a size of not less than 5 .mu.m. The adhesive may be a vinyl ether adhesive and may be coated upon a backing layer such as a hydrophilic polyurethane to produce products suitable for use as wound dressings, IV dressing or incise drapes. The chlorhexidine gluconate may be obtained as a freeze-dried solid and added directly, in suspension, to the adhesive mass without further milling.