Full definition
A poured or troweled floor system based on polyurethane (PU) resin applied directly onto prepared concrete, offering greater flexibility, impact resistance, and thermal cycling tolerance than epoxy flooring. Typical system: primer (PU or epoxy), body coat(s) of PU resin with aggregate/filler, and optional topcoat/sealer. Total thickness: 2-9 mm depending on system type. Key advantages over epoxy: superior crack-bridging capability (PU flexes with concrete movement rather than cracking), better performance in cold storage environments (-25°C — PU remains flexible while epoxy becomes brittle), excellent impact and abrasion resistance, quieter underfoot, and UV color stability (aliphatic PU). Types: PU screed (4-9 mm, troweled, for heavy traffic), PU self-level (2-4 mm, for smooth finish), PU coating (0.5-2 mm, thin protection), and PU/cement hybrid (cementitious urethane — combines concrete hardness with PU toughness, the gold standard for food/beverage plants). Applications: food and beverage processing (USDA-approved, thermal shock resistant for washdowns), cold rooms and freezers, pharmaceutical manufacturing, loading docks, and parking garages. Per ASTM C1028, USDA/FSIS. Brands: Flowcrete, Stonhard, Sika, BASF.