1: they’re primarily using perlite and magnesium. 2: different design philosophy means different technology. 3: Many old cultures across the planet have used variations of round structures. Look at the US Natives that built grass house as just one example. 4: ceramic lasts a long time. Extra point, round structures are better for natural disasters.

@ 1-Perlite is not a polymer. It has the troublesome feature of expanding or contracting a lot when heated or cooled so it’s not dimensionally very stable. Magnesium is ALSO not a polymer, Its a metal, and a highly flammable metal at that. 2- Design philosophy has nothing to do with technology. I can make a dome out of carbon fiber, or I can make a dome out of stone. The plain fact is that MOST new technologies applied to building design have turned out to be problematic. From PVC plumbing, to central air, many create 2 new problems for each problem they solve. 3- No cultures other than hippies have made spherical houses. The floor plan being round versus square is NOT the problem ( except when trying to fit furnishings and appliances in it ) Its the fact that the WALLS and roof form a continuous constant arc. This means that even mild wind can overcome gravity and drive rain upwards or sideways around the curve. Which is why dome houses are infamously hard to weatherproof and keep weatherproof. Cultures that made round houses STILL made them with conical roofs that featured significant overhang on the eaves and Vertical wall. This design was not based upon ‘philosophy’ it was Evolved over centuries of practical experience at what kept water out of the house versus what did not. Modular triangular panels have to be weather sealed along their entire perimeter, And houses MOVE. They expand and contract with changes in temperature and barometric pressure and they FLEX under wind loading. For this reason it is the joints between triangular panels that lose their weather tightness and start to leak. There is no way to consistently Flash these joints that wind driven rain cannot get under because of their wildly varying orientations. 4- Vitreous ceramic lasts a long time. Like the ceramic your toilet is made from where it has been fired high enough to become glass. Low fire ceramics like terra cotta are porous and can absorb water and water can leak THRU them. Like porcelain tile, versus bisque fired tile. Porcelain is suitable for exterior exposure, but bisque fired ceramics will not survive a century outdoors without erosion, spalling, or mold intrusion. And high fired ceramics are neither cheap, nor environmentally friendly. It takes a LOT of energy to fire ceramics. Extra point. There is zero evidence that ‘round’ structures are better for natural disasters. A lot depends on the nature of the disaster. An earthquake will shake a dome apart as readily as any other building. The key to surviving earthquake is strong ties between structural elements that are somewhat flexible. ( ie wood framed structures survive earthquake better than brick. ) Round offers no real protection against floods, because floods to not break up houses thru their lateral force or pressure on the house, what they do is surround the house, creating buoyancy forces so strong that the house is Floated off its foundation, and once its no longer held in shape by its foundation, the house can flex and buckle in the current of the water. Water only has to get a couple feet higher outside the house than in to tear it loose thru buoyancy. A spherical house with no shingles on the outside might withstand the wind forces of a tornado or hurricane, but without the shingles it certainly WILL leak. But tornadoes also destroy houses by rapidly dropping the air pressure outside the house so its own internal air pressure will push it apart from the inside. And a geodesic house does not necessarily offer any greater resistance to this potential unless it geodesic are bolted metal bars. But that won’t prevent the triangular filling between them from popping out. Sorry. Houses have the shape they traditionally have based upon what proved to work. Spherical houses were tried back the 70’s and 80’s and people pretty much stopped building them because they did Not work. Harder to heat and cool, harder to remodel, harder to furnish, harder to waterproof. Look at the manor houses in England and France, or even the old cottages that litter their countryside if you want to see what design philosophy actually has proven to last 100 years, or more.

Outside is panels with sealing over each gap. The sealant is applied liquid bioceramic. When it’s done it’s basically one piece. Any cracks or issues down the years can be repaired the same way. Like sealing cracked concrete with liquid concrete basically…