A Method to Measure Oil Penetration into Hair and Correlation to Tensile Strength

The study developed a method to measure oil penetration into hair by assessing hair thickness and cohesive force, and explored its correlation to tensile strength. It compared Type 3 hair oil and coconut oil, finding that Type 3 hair oil led to a greater increase in hair thickness and a more significant reduction in cohesive force than coconut oil. Both oils improved tensile strength, but Type 3 hair oil had a more pronounced effect. The results suggest that measuring hair thickness and cohesive force can effectively indicate oil penetration, which positively influences hair strength.