Name: Castor Oil (Industrial Grade Polyol)
Brand: Coatingsink
SKU: castor-oil-polyol
Availability: InStock

Question 1

What makes castor oil suitable as a polyol for polyurethane coatings?

Accepted Answer

Castor oil (ricinoleic acid triglyceride) carries a naturally occurring secondary hydroxyl group on the fatty acid chain, giving a hydroxyl value of ~160 mgKOH/g and average functionality of ~2.7. This makes it a trifunctional natural polyol that can react directly with isocyanates to form flexible PU networks without chemical modification.

Question 2

How does castor oil affect the flexibility of PU coatings compared to synthetic polyols?

Accepted Answer

Castor oil's long C18 fatty acid chains provide inherent flexibility and good moisture resistance. Films are more flexible than those from synthetic polyester polyols of the same OH value. The long hydrophobic chains improve water repellency. A typical application is brush-applied 2K PU wood coatings requiring both hardness and crack-bridging flexibility.

Moisture	≤0.1%
Acid Value	≤2 mgKOH/g
Hydroxyl Value	155–165 mgKOH/g
Color (Gardner)	≤3
Viscosity (25°C)	650–900 mPa·s

Castor Oil (Industrial Grade Polyol)

Specifications

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