Finding F-1402

“Experiments conducted in the Purdue zEDGE Test House revealed that hair styling at temperatures above 300 °F produced indoor nanoparticle concentrations ranging from 10,000 to over 100,000 particles cm−3, with sub-100 nm particles typically accounting for more than 95% of total number concentrations at temperatures exceeding 360 °F.”

Indoor Nanoparticle Emissions and Exposures during Heat-Based Hair Styling Activities… (2025). Environmental science & technology. Page 1. CKB 6246

Structure

Factor: Ultrafine particles (UFP)
Setting: test house, US
Study design: experiments in the Purdue zEDGE test house: hair styling with a straightener, a curler and a waver at controlled tool temperatures while indoor nanoparticle number concentrations and the inhaled dose were measured (class 3)
Effect: other 100000
Caveat: a test house, not an occupied home; above 360 degrees Fahrenheit more than 95 % of the number concentration is below 100 nanometres; the sentences that give the doses and the low-temperature values print their powers of ten flattened in the text layer, so they are not taken

A Finding records what one published document states, verbatim and with its page. It is not a conclusion of Coridum; see the Claims that build on it.