What's the difference between castor oil and other oils? Can it replace polyether in polyurethane adhesive? What is the reason? thank you

Castor oil is non-drying oil. Generally, about 20% of polyether can be substituted. Excessive use has an effect on polyurethane system. If the glue is one-component, the hydroxyl value of polyether is generally 50. Exceeding it will affect storage. The hydroxyl value of castor oil is about 145. The acid number is 4. And generally, the glue should not exceed 1.