“Comprehensive Guide to Shuttering Oil: Types, Application & Choosing the Best”

Shuttering Oil: Types, Priorities, Technical Specifications, Usage & Coverage

What is Shuttering Oil?

Shuttering oil (also known as formwork oil or mold release agent) is a specialized liquid applied to formwork surfaces before pouring concrete. Its main function is to prevent fresh concrete from sticking to formwork, resulting in smooth, clean concrete surfaces and ensuring easy removal of the formwork after curing.

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Types of Shuttering Oil

Type	Description	Advantages	Suitability
Neat Oils	Mineral-based oils, sometimes with additives.	Inexpensive; good for hidden or underground	Not recommended for high-quality visible works due to risk of blowholes
Mould Cream Emulsions	Blend of neat oil and water; minimizes blowholes.	Better surface finish; less risk of defects	General purposes, but can be washed by rain; not ideal for steel formwork
Solvent-Based Oils	Petroleum-derived, fast-drying, strong odor.	Excellent release, quick drying	When quick turnover is needed
Water-Based Oils	Environmentally friendly, lower odor, less harmful.	Low VOCs; eco-friendly; suitable for most formworks	All types, gaining popularity
Emulsion-Based Oils	Good release property with minimal volatile emissions.	Good surface finish, low VOCs	Versatile use
De-Shuttering Oil (DSO)	Premixed, ready-to-use; no dilution needed.	Economical, non-toxic, easy to apply	All types of formwork
De-Shuttering Oil Emulsion (DSOE)	Concentrate that is diluted before use; effective as a mold release agent.	Cost effective, can tailor dilution	Wide use, especially on wood
Specialty Oils	Formulated for extreme conditions or specific textures.	Meets unique needs	Extreme temps, or aesthetic surfaces

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Priorities When Choosing Shuttering Oil

• Formwork material: Use thicker oils for wooden formwork, lighter/non-staining oils for metal, light coat for plastic/composite.

• Quality of finish: Water/emulsion-based oils tend to give smoother, defect-free surfaces.

• Project environment: Choose as per site weather conditions and desired finish.

• Eco-friendliness: Water-based and emulsion oils are less harmful to the environment.

• Reusability: The right oil increases the lifespan of expensive formwork.

• Cost efficiency: Factor in not just price per litre, but coverage and ease of use.

• Ease of application: Oils that can be sprayed or applied with a roller are easier and provide consistent finish.

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Technical Specifications (Typical Example)

Property	Range / Value
Kinematic Viscosity @ 40°C	20–24 cSt
Flash Point (°C)	Minimum 160
Pour Point (°C)	Maximum -3
Colour (ASTM)	Up to 4.0
Form	Liquid (oils/emulsions)
Shelf Life	12 months or per manufacturer

Specific values vary by product and supplier – always check the latest TDS.

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How to Use Shuttering Oil

1. Clean the Surface: Ensure formwork is free from dirt, cement, or previous oil remnants.

2. Application:

   • Use spray, brush, or roller.

   • Apply a thin, uniform film; avoid overcoating.

   • For emulsions, dilute as per instructions (e.g., 1:5 with water for most de-shuttering emulsions).

3. Timing: Always apply before pouring concrete, not after.

4. Surface Inspection: Remove any oil pools to prevent surface defects.

5. Curing: Let the oil set if required, then proceed with concrete pouring.

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Coverage

• Coverage: 350–450 sq. ft. per litre, depending on oil type, formwork texture, and porosity.

• Tips for Maximizing Coverage:

  • Use only as much as needed for a thin film.

  • Regular cleaning and maintenance of formwork improve oil efficiency.

  • Avoid over-application, especially on wooden fats where absorption can increase usage.

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Which is the Best Type of Shuttering Oil?

• General construction: Water-based and emulsion oils are best for most projects due to smooth finish, low odor, and environmental friendliness.

• Specialized needs: Specialty oils for extreme temperatures, quick-drying solvent-based oils for fast cycles, or thick neat oils for underground/hidden work.

• Mivan/aluminum formwork: Products like PASAND MRO-MIVAN are recommended for best performance.

• For plywood and reusable forms: High-quality mineral or emulsion-based oils yield the best formwork protection and repeat usage.

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Conclusion

Shuttering oil is an essential construction product that ensures smooth, defect-free surfaces, protects expensive formwork, boosts project efficiency, and contributes to a safer, cleaner jobsite. Selecting the right type based on material, finish, environment, and application method is critical for best results.

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