Denim cotton fabric can be recycled using PIN flame retardants to produce composite boards for fire compartmentation. The world produces some 150 million t/y of textile waste. This review suggests that end-of-life denim cotton fibres treated with PIN flame retardants (such phosphorus-based compounds, nano-coatings or borates) can be used to produce structural boards suitable for use as fire-resistant barriers (fire compartmentation). pinfa notes FRs are important to ensure fire safety of recycled organic materials used in construction. See e.g. pinfa Newsletter n°38: recycled denim based material used for insulation caused fire spread, resulting in 6 million US$ damage to an industrial building in Wisconsin in 2014
“Development of fire retarding composite board for fire compartmentation application using waste denim: A review”, Aman et al., Materials Today Proceedings 2022 https://doi.org/10.1016/j.matpr.2021.12.513