Meaning
Ratio representing the relative solubility of a chemical in a non-polar solvent versus a polar solvent. Octanol-water partition coefficient log kow represents a measure of how likely a plastic additive is to migrate into fatty foods. A high value indicates that a substance is lipophilic and prefers the oil-like octanol phase.
Migration Prediction
Chemists use the coefficient to estimate the potential for a stabilizer or pigment to leach out of a polymer. Since many plastics are hydrophobic, they tend to hold onto substances with a high octanol-water partition coefficient log kow. This value helps in selecting additives that will remain within the plastic matrix.
Environmental Impact
Number indicates whether a chemical will bioaccumulate in the fatty tissues of organisms if released into the water. Regulatory agencies use octanol-water partition coefficient log kow to screen for persistent pollutants. It is a fundamental data point in the safety assessment of new polymer formulations.
Solubility Limit
Scale is logarithmic, meaning a small change in the value represents a tenfold change in the partition ratio. Most common plasticizers have a specific octanol-water partition coefficient log kow that dictates their compatibility with different resins. If the value is too high, the additive may bloom to the surface due to poor solubility in the host polymer.
Manufacturers rely on this metric to ensure the long-term stability of the resin blend.
