What should a sturdy commercial lounge chair frame be made of?

Steel frames are the gold standard for lounge seating that sees serious daily traffic — they resist racking and hold up better under sustained load than wood alternatives. Kiln-dried hardwood frames (birch, beech, poplar) are lighter and show up in mid-grade commercial products; they work fine for moderate use. What you want to avoid is particleboard or MDF in the frame — those materials break down under repetitive stress over time. FindOfficeFurniture.com details frame construction in each product listing — call 888-719-4960 if you have specific durability requirements.