Application of Single Hair Fibre Tensile Measurements to Create an Industry-Standard Heat Damage Scale for Hair

The study addresses the lack of a standardized method for measuring heat damage to hair caused by styling tools. Researchers propose a 6-point heat damage scale based on single-fibre tensile strength measurements, focusing on 8 wet tensile parameters. This scale is designed to be robust, reproducible, and relevant to consumers. The study demonstrates a strong correlation between the technical damage scale and human perception of hair damage, validating its applicability to various heated hair straighteners on the market. The research was conducted by Good Hair Day (GHD) and funded internally, with data available upon request.