Blown Castor Oil is a chemically modified castor oil produced by controlled oxidation (air blowing) of refined castor oil derived from Ricinus communis. The blowing process increases viscosity, molecular weight, and polarity, resulting in an oil with enhanced body, tack, and film-forming characteristics.
Industrially, blown castor oil is used as a functional modifier and intermediate in applications where thickness, adhesion, and stability are required.
Product Overview
Blown castor oil originates from castor oil obtained from castor seeds. Through controlled air oxidation, the oil undergoes polymerization, producing grades with higher viscosity and improved performance compared to untreated castor oil.
Common industrial forms and grades:
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Low-viscosity blown castor oil
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Medium- and high-viscosity blown castor oil (grade dependent)
At a high level, blown castor oil differs from standard castor oil by offering greater consistency, tackiness, and film strength, making it suitable for specialized industrial formulations rather than general-purpose use.
Manufacturing Process (High Level)
The industrial production of Blown Castor Oil follows a controlled, non-proprietary pathway.
1. Raw Material Sourcing
Refined castor oil sourced from castor seeds is used as the base feedstock.
2. Air Blowing / Oxidation
Air is introduced under controlled conditions, promoting oxidation and polymerization of the oil.
3. Viscosity Development
The degree of blowing determines final viscosity and performance characteristics.
4. Finishing & Filtration
The oil is stabilized, filtered, and prepared for packaging.
5. Quality Control Stages
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Incoming raw material inspection
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In-process monitoring
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Final batch testing prior to dispatch
Specific temperatures, air flow rates, or proprietary conditions are not disclosed.
Key Properties & Technical Characteristics
Blown castor oil performance is governed by its modified molecular structure. Each property influences formulation behavior.
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Appearance & Physical State – Clear to amber viscous liquid; darker color may correlate with higher blowing degree.
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Odour – Mild oxidized oil odour; acceptable for industrial applications.
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Viscosity – Significantly higher than untreated castor oil; critical for thickening and binding roles.
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Specific Gravity – Slightly increased due to polymerization.
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Acid Value – Controlled within specification to ensure stability.
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Hydroxyl Value – Reduced compared to raw castor oil due to oxidation.
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Iodine Value – Lower than native castor oil, reflecting oxidation and saturation changes.
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Moisture Content – Low moisture supports storage stability.
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Unsaponifiable Matter – Monitored to ensure consistent performance.
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Oxidation Stability – Improved resistance to further degradation under normal conditions.
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Typical Impurities Monitored – Residual particulates and oxidation by-products.
Typical Technical Parameters
| Parameter | Typical Indication |
|---|---|
| Appearance | Clear to amber viscous liquid |
| Viscosity Range | Grade-dependent — confirm with Certificate of Analysis (COA) |
| Key Chemical Values | Typical range — confirm with COA |
Exact numerical values vary by grade and must be confirmed with the COA.
Applications & End-Use Industries
Pharmaceuticals
Use case: Limited, formulation-specific intermediate.
Why it works: Enhanced body and stability.
Examples: Specialized excipient systems (application dependent).
Cosmetics & Personal Care
Use case: Texture and viscosity modifier.
Why it works: Thickening and film-forming behavior.
Examples: Specialty creams, hair products, cosmetic bases.
Lubricants & Greases
Use case: Viscosity modifier and binder.
Why it works: Increased molecular weight and lubricity.
Examples: Industrial lubricants, grease formulations.
Polymers & Resins
Use case: Modifier and renewable intermediate.
Why it works: Improved compatibility and binding characteristics.
Examples: Alkyd resins, modified polymer systems.
Paints, Coatings & Adhesives
Use case: Binder and film-forming component.
Why it works: Enhances adhesion, gloss, and film strength.
Examples: Industrial paints, varnishes, printing inks, adhesives.
Specialty & Other Industrial Uses
Use case: Functional oil for tailored applications.
Why it works: Adjustable viscosity and polarity.
Examples: Rubber processing aids, specialty compounds.
Quality Standards & Compliance Practices
Blown castor oil is supplied based on testing discipline and batch verification, not unverifiable certification claims.
Common practices include:
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Acid value testing
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Moisture analysis
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Appearance and odour checks
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Viscosity monitoring
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Batch traceability
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Availability of COA, TDS, and MSDS
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Quality systems aligned with generic ISO-style frameworks
Packaging, Storage & Export Handling
Common packaging options:
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HDPE drums
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IBC containers
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Bulk supply (application dependent)
Storage guidelines:
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Store in a cool, dry, sealed environment
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Protect from excessive heat and air exposure
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Shelf life depends on storage conditions and grade
Export documentation typically includes:
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Commercial Invoice
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Packing List
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Certificate of Analysis (COA)
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MSDS
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Bill of Lading
HS Code: Provided on request
MOQ & Lead Time: Subject to grade, packaging, and incoterms; confirm at enquiry
Why Buyers Source Blown Castor Oil from India
India is a major origin for castor oil and its derivatives. Gujarat serves as a key processing and export hub due to integrated agricultural sourcing, established oil modification infrastructure, and strong port connectivity, supporting traceable and consistent global supply.
Frequently Asked Questions (FAQs)
1. What is blown castor oil mainly used for?
As a thickener, binder, and film-forming oil in industrial formulations.
2. How does it differ from regular castor oil?
It has higher viscosity and improved film-forming properties due to oxidation.
3. Is it water-soluble?
No, it is insoluble in water.
4. How should it be stored?
In sealed containers, away from heat and moisture.
5. What affects shelf life?
Storage conditions and degree of oxidation.
6. Are batches tested before dispatch?
Yes, routine QC checks are performed.
7. Are multiple viscosity grades available?
Yes, grades may vary based on application needs.
8. Is export documentation provided?
COA, MSDS, and standard export documents are available.
Technical Enquiries
For technical datasheets, samples, or commercial enquiries, buyers may contact Nova Industries at export@novaind.in.
