The Venera landers of the former Soviet Union were quite successful on the very hot surface of Venus.
Which material was used for the parachutes to survive 500 °C?
What about cotton wool? Yes this fiber will burn in air at 500 °C but there is no free oxygen in the atmosphere of Venus.
There is a process for the production of carbon fibers by heating of rayon fibers without oxygen. "Rayon is a synthetic fiber, made from natural sources of regenerated cellulose, such as wood and related agricultural products." Of cause cotton wool is cellulose too.
Thomas Alva Edison held a patent describing several ways of creating the carbon filament including "cotton and linen thread, wood splints, papers coiled in various ways". Carbon filaments used for electric light