Hospital sofas must prioritize infection control and high-frequency use. The upholstery should be medical-grade PVC or PU leather that is antimicrobial, antifungal, and resistant to chemical disinfectants (such as bleach or alcohol solutions). For the internal structure, kiln-dried solid wood or powder-coated steel frames are recommended to prevent warping and support a weight capacity of at least 300-500 lbs per seat. High-density, fire-retardant foam (e.g., CA117 or BS5852 standards) is crucial for both safety and maintaining shape over time.