What is blown castor oil?

Blown castor oil is castor oil that has been oxidized by blowing air or oxygen through it at elevated temperature to increase viscosity and change its drying and plasticizing behavior. The result is a clear to pale golden, viscous liquid that is non‑drying and insoluble in water.

How is blown castor oil different from regular castor oil?

Compared with regular castor oil, blown castor oil has higher viscosity, higher acid and saponification values, and improved film‑forming and plasticizing properties. These modifications make it far better suited for inks, varnishes, hydraulic fluids, adhesives and leather finishes where migration‑free plasticization is critical.

What are the main industrial uses of blown castor oil?

It is widely used as a non‑migrating plasticizer in paints, varnishes, printing inks, sealants, rubber compounding and leather finishing. It is also used in specialty hydraulic oils, lubricants and as a polyol component in certain polyurethane and coating systems.

Why do formulators choose blown castor oil as a plasticizer?

Blown castor oil is non‑volatile and non‑migrating, so it improves flexibility and durability without bleeding or fogging, even over long service life. Its high hydroxyl and saponification values also enhance adhesion and compatibility with many resins and polymers.

What key specifications should buyers check on a blown castor oil COA?

Important parameters include viscosity at 20–25 °C, acid value, saponification value, iodine value, hydroxyl value, Gardner colour and density. These values indicate the degree of blowing and strongly influence compatibility, plasticizing efficiency and processing behavior.

Is blown castor oil compatible with common resin systems?

Blown castor oil shows good compatibility with many alkyds, maleic resins, natural resins and other film‑formers used in paints, varnishes and inks. It also works well with certain polyurethane and lubricant base oils where higher viscosity and polarity are desired.

How should blown castor oil be stored to maintain quality?

Store in tightly closed drums or IBCs in a cool, dry, well‑ventilated place away from direct sunlight and strong oxidizing agents. Keep containers sealed to avoid moisture uptake and contamination; under recommended conditions, shelf life typically extends 12 months or more from production.

Are there any special handling or safety considerations?

Blown castor oil is generally regarded as low‑toxicity, but standard chemical handling practices apply: avoid prolonged skin contact, use eye protection and ensure adequate ventilation when pumping or heating. Refer to the supplier’s Safety Data Sheet for detailed information on exposure limits, fire behavior (high flash point) and disposal guidance.

CanCastorPure • Natural • Bulk

Blown Castor Oil – Bulk Oxidized Castor Oil for Inks, Varnishes & Leather

castor oil derivative

Quality Guaranteed

COA available with every shipment.

Bulk Packaging

Drums, totes, or custom sizing.

Technical Specifications

Acid Value	≤9–18 mg KOH/g
Appearance	Golden to brown viscous liquid
CAS Number	68187‑84‑8
Flash Point	~170 °C
Product Name	Blown Castor Oil
Density (20°C)	0.996–1.009 g/cm³
Alternative Names	Oxidized/Polymerized Castor Oil
Viscosity (25°C)	75–105 P (Medium Grade)

Blown Castor Oil – Bulk Oxidized Castor Oil for Inks, Varnishes & Leather

Name: Blown Castor Oil – Bulk Oxidized Castor Oil for Inks, Varnishes & Leather
Brand: CanCastor
SKU: 9c4c35f0-a3eb-409d-8a63-72cdcffc1cff
Availability: InStock

Grade:Industrial Grade

MOQ:1000Kg

Packing:Steel/HDPE drums: usually 180–200 kg or 200 L net

Request Quote

Description

Blown Castor Oil is an oxidized castor oil derivative with increased viscosity and drying properties. It is widely used in plasticizers, lacquers, and leather coatings for superior durability.

Frequently Asked Questions

Need a custom formulation?

Our team can help you develop specific blends or source unique grades for your application.

Contact Sales Team →