This code system http://standardhealthrecord.org/shr/skin/cs/SupportSurfaceComponentCS defines the following codes:

CodeDisplayDefinition
airAirAir
cellCell or bladderCell or bladder
viscoelasticViscoelastic foamViscoelastic foam
elasticElastic foamElastic foam
closed_cellClosed cell foamClosed cell foam
open_cellOpen cell foamOpen cell foam
gelgelgel
padpadpad
viscousViscous fluidViscous fluid
elastomerElastomerElastomer
solidSolid surfaceSolid surface
waterWaterWater