the bamboos are treated

Bamboo Chemical Injection (Fire-Retardant Treatment)
• Fresh bamboo poles are placed inside a sealed pressure chamber
• Vacuum is applied to remove air inside bamboo pores
• Fire-retardant chemical solution (borax, boric acid, ammonium salts) is added
• High pressure is applied to force chemicals deep into the bamboo fibers
• Treatment reaches the internal cellular structure
• Bamboo is then removed, dried, and cured
• Result: long-lasting internal fire-retardant protection
• Much more durable than soaking or spraying
• Protection remains even after rain and long outdoor exposure
but why wumaos never blame the first culprit - the safety net and foam

given steel scaffolding under high temperatures

it will become like this



if the steel were used instead of bamboo, firemen and crowds in the street would be dead by the crushing steel fell onto them

That's not fire retardant man
That's akin to casting fire onto clothes dipped with petrol

The burning of foam did emit toxic gases and CO which did suffocate the victims