Question: What is the main ingredient of the finishing material inside the Dymaxion deployment units?

full_context: Document 1: Buckminster Fuller: Richard Buckminster "Bucky" Fuller ( ; July 12, 1895 – July 1, 1983) was an American architect, systems theorist, author, designer, and inventor.
Document 2: Concrete plant: A concrete plant, also known as a batch plant or batching plant or a concrete batching plant, is equipment that combines various ingredients to form concrete. Some of these inputs include water, air, admixtures, sand, aggregate (rocks, gravel, etc.), fly ash, silica fume, slag, and cement. There are two main types of concrete plants: "Dry mix" plants and "Wet mix" plants, and also plants that contain both a transit mix side and a central mix side while utilizing common material storage points. A concrete plant can have a variety of parts and accessories, including: mixers (either "tilt drum" or "horizontal" or in some cases both), cement batchers, aggregate batchers, conveyors, radial stackers, aggregate bins, cement bins, heaters, chillers, cement silos, batch plant controls, and dust collectors.
Document 3: J. Baldwin: James Tennant Baldwin (born 1933) (whose books and articles have been published under the names J. Baldwin, Jay Baldwin, and James T. Baldwin) is an American industrial designer and writer. Baldwin was a student of Buckminster Fuller; Baldwin's work has been inspired by Fuller's principles and (in the case of some of Baldwin's published writing) has popularized and interpreted Fuller's ideas and achievements. In his own right, Baldwin has been a figure in American designers' efforts to incorporate solar, wind, and other renewable sources of energy. In his career, being a fabricator has been as important as being a designer. Baldwin is noted as the inventor of the "Pillow Dome," a design that combines Buckminster Fuller's geodesic dome with panels of inflated ETFE plastic panels.
Document 4: The Last Dymaxion: The Last Dymaxion: Buckminster Fuller’s Dream Restored is a 2012 documentary film directed by Noel Murphy. about Buckminster Fuller's 1933 Dymaxion car as well as Fuller himself.
Document 5: Interstitial condensation: Interstitial condensation is a form of structural damping that occurs when warm, moist air penetrates inside a wall, roof or floor structure, reaches the dew point and condenses into liquid water. Interstitial condensation is differentiated from surface condensation in buildings sometimes called "cold-bridge condensation" or "warm front condensation" where the condensation forms on the interior or exterior surfaces of a building rather than inside the wall or roof cavities. The warm, damp air may penetrate a wall from the inside of a heated building in a cold climate or from the exterior of an air-conditioned building in a warm climate. This condensation may allow mold growth, rotting of timber, corrosion of metal components and/or a reduction in the thermal insulation's effectiveness. The resulting structural damage may occur without visible indications until significant damage has occurred. Most building materials are permeable so the common method of controlling interstitial condensation is to control indoor moisture at its sources or through dehumidification and/or ventilation and add an impermeable barrier on the warm side of the wall.
Document 6: Cloud Nine (tensegrity sphere): Cloud Nine is the name Buckminster Fuller gave to his proposed airborne habitats created from giant geodesic spheres, which might be made to levitate by slightly heating the air inside above the ambient temperature.
Document 7: Dymaxion car: The Dymaxion car was designed by American inventor Buckminster Fuller during the Great Depression and featured prominently at Chicago's 1933-1934 World's Fair. Fuller built three experimental prototypes with naval architect Starling Burgess — using gifted money as well as a family inheritance — to explore not an automobile per se, but the 'ground-taxiing phase' of a vehicle that might one day be designed to fly, land and drive — an "Omni-Medium Transport". Fuller associated the word "Dymaxion" with much of his work, a portmanteau of the words dynamic", maximum", and "tension", to summarize his goal to do more with less.
Document 8: R. Buckminster Fuller and Anne Hewlett Dome Home: The R. Buckminster Fuller and Anne Hewlett Dome Home, located at 407 S. Forest Ave. in Carbondale, Illinois, is a geodesic dome house which was the residence of Buckminster Fuller from 1960 to 1971. The house, inhabited by Fuller while he taught at Southern Illinois University, was the only geodesic dome Fuller lived in as well as the only property he ever owned. Fuller, a prolific architect and engineer, popularized the geodesic dome as a building design, and his house was one of the first geodesic dome residences to be constructed. The home was built and designed by Al Miller of the Pease Woodworking Company. While living in the home, Fuller was awarded nine patents, published eleven books, and designed the Montreal Biosphère, one of his most famous works.
Document 9: Blister hangar: A blister hangar is a novel arched, portable aircraft hangar designed by notable British airport architect Graham R Dawbarn patented by Miskins and Sons in 1939. Originally made of wooden ribs clad with profiled steel sheets, steel lattice ribs and corrugated steel sheet cladding later became the norm. It does not require a foundation slab and can be anchored to the ground with iron stakes. Numerous examples were manufactured for military use in World War 2 and various different sizes were available. Many found post-war use as agricultural or industrial buildings and some still remain in use on airfields such as Fairoaks, Redhill, Coal Aston and White Waltham today. Denham Aerodrome still uses their blister hangar to house the only fixed wing flying school on the field, The Pilot Centre.
Document 10: Cotton paper: Cotton paper, also known as rag paper, is made using cotton linters or cotton from used cloth (rags) as the primary material. Important documents are often printed on cotton paper, because it is known to last many years without deterioration. Cotton paper is superior in both strength and durability to wood pulp-based paper, which may contain high concentrations of acids, and also absorbs ink or toner better. Different grades of cotton paper can be produced.
Document 11: Paperboard: Paperboard is a thick paper-based material. While there is no rigid differentiation between paper and paperboard, paperboard is generally thicker (usually over 0.25 mm, 0.010 in, or 10 points) than paper. According to ISO standards, paperboard is a paper with a grammage above 224 g/m, but there are exceptions. Paperboard can be single- or multi-ply. Paperboard can be easily cut and formed, is lightweight, and because it is strong, is used in packaging. Another end-use would be graphic printing, such as book and magazine covers or postcards. Sometimes it is referred to as "cardboard", which is a generic, lay term used to refer to any heavy paper pulp–based board. Paperboard is also used in fine arts for creating sculptures.
Document 12: Dymaxion deployment unit: A Dymaxion deployment unit (DDU) is a structure designed in 1940 by Buckminster Fuller consisting of a 20-foot circular hut constructed of corrugated steel looking much like a yurt or the top of a metal silo. The interior was insulated, finished with wallboard, portholes and a door. The dome-like ceiling has a hole in the top and a cap for ventilation.
Document 13: Rosendale cement: Rosendale cement generally refers to a type of natural cement that was produced in and around Rosendale, New York, from argillaceous limestone, but is a term that has had different definitions at different times. The fast-setting Rosendale natural cement mortars proved to be more efficient than the mortars based on lime and sand. Because of its reputation, Rosendale cement has also been used as both a trade name and as a generic term referring to natural hydraulic cements produced elsewhere. It was used in the construction of many of the United States' most important landmarks, including the Brooklyn Bridge, the pedestal of the Statue of Liberty, Federal Hall National Memorial, and one of the wings of the United States Capitol building.
Document 14: Drywall: Drywall (also known as plasterboard, wallboard, gypsum panel, sheet rock, or gypsum board) is a panel made of calcium sulfate dihydrate (gypsum) with or without additives and normally pressed between a facer and a backer (typically thick sheets of paper). It is used to make interior walls and ceilings. The plaster is mixed with fiber (typically paper and/or fibreglass), plasticizer, foaming agent, and various additives that can decrease mildew, increase fire resistance, and lower water absorption.
Document 15: Drafting film: Drafting film is a sturdier and more dimensionally stable substitute for drafting paper sometimes used for technical drawings, especially architectural drawings, and for art layout drawings, replacing drafting linen for these purposes. Nowadays it is almost invariably made of transparent biaxially oriented polyethylene terephthalate, which should last several centuries under normal storage conditions, with one or two translucent matte surfaces provided by a coating. However, some older drafting films are cellulose acetate, which degrades in only a few decades due to the vinegar syndrome. Uncoated films are preferred for archival, because there is then no possibility that the coating material could deteriorate over time or react with other materials.
ground_truth: calcium sulfate dihydrate