Residual Wax

The Role of Residue Wax in Metal Casting and Foundries

Residue wax, also known as foots oil, plays a crucial role in metal casting and foundry operations. It is a byproduct of the petroleum refining process, specifically during the production of base oils and paraffin wax. This versatile material has numerous applications across various industries, but its importance in metal casting and foundries cannot be overstated. In this comprehensive blog, we will delve into how it is used in metal casting processes, its benefits in foundry operations, and why Paraffin Co. stands out as a premier supplier of high-quality residue wax.

Understanding Residue Wax / Foots Oil

What is Residue Wax?

Residue wax, or foots oil, is a semi-solid byproduct obtained during the refining of crude oil. It consists of a mixture of hydrocarbons, primarily long-chain paraffins and microcrystalline waxes. The term “foots oil” originates from the bottom residue left in the wax refining process, commonly referred to as the “foots.”


Residue wax is characterized by:

Metal Casting and Foundry Operations

Metal casting is a manufacturing process where molten metal is poured into a mold and allowed to solidify into a specific shape. This process is used to produce complex metal parts and structures with precise dimensions. Metal casting is widely used in industries such as automotive, aerospace, machinery, and construction.

A foundry is a facility where metal casting is performed. Foundry operations encompass several steps, including:

  1. Pattern Making: Creating a model of the final product, known as a pattern, which is used to form the mold.
  2. Mold Making: Constructing the mold cavity, typically using sand or other refractory materials, to hold the molten metal.
  3. Melting: Heating the metal until it reaches a liquid state.
  4. Pouring: Pouring the molten metal into the mold cavity.
  5. Cooling and Solidification: Allowing the metal to cool and solidify within the mold.
  6. Shakeout and Cleaning: Removing the solidified metal casting from the mold and cleaning it of any residual mold material.
  7. Finishing: Performing additional processes, such as machining, to achieve the desired final dimensions and surface finish.

The Role of Residue Wax in Metal Casting

One of the primary uses of residue wax in metal casting is as a mold release agent. During the casting process, molten metal is poured into molds to form specific shapes. To ensure the smooth release of the solidified metal from the mold, a mold release agent is applied to the mold surfaces. it is ideal for this purpose due to its high melting point and lubricative properties.

Residue wax is also used in investment casting, a precision casting technique that involves creating a wax pattern, which is then coated with refractory material to form a mold. The wax pattern is melted out to leave a cavity for the molten metal. it’s stability and ease of melting make it an excellent choice for creating detailed wax patterns in investment casting.

In foundry operations, sand cores are used to form internal cavities within the cast metal parts. It is utilized as a binder for sand cores, helping to hold the sand particles together and maintain the core’s shape during the casting process. This ensures the accuracy and integrity of the internal cavities in the final metal castings.

Residue wax’s lubricative properties are beneficial in various stages of the metal casting process. It reduces friction between the mold and the molten metal, facilitating smooth pouring and reducing defects in the final castings. Additionally, it aids in the easy removal of castings from the molds, minimizing the risk of damage to the parts.

The use of residue wax as a mold release agent and in investment casting contributes to improved surface finish of the final metal castings. By preventing the metal from sticking to the mold surfaces, It helps achieve a smooth and defect-free surface on the cast parts, reducing the need for extensive finishing processes.

Benefits of Residue Wax in Foundry Operations

Residue wax’s high melting point and lubricative properties make it an effective mold release agent. It ensures the easy separation of the solidified metal from the mold, reducing the risk of mold damage and enhancing the overall efficiency of the casting process.

Using residue wax in investment casting and as a core binder helps produce high-quality metal castings with precise dimensions and smooth surfaces. This reduces the need for additional machining and finishing, saving time and costs.

Residue wax’s role in reducing friction and facilitating mold release enhances the overall efficiency of foundry operations. It minimizes the occurrence of casting defects and the need for rework, improving the productivity of the foundry.

Residue wax is a cost-effective solution for foundry operations. Its versatility and effectiveness in various stages of the casting process contribute to lower production costs and higher profitability for foundries.

Paraffin Co. as a Supplier of High-Quality Residue Wax

Paraffin Co. is dedicated to providing high-quality residue wax that meets the stringent requirements of the metal casting and foundry industry. The company’s residue wax is sourced from reputable refineries and undergoes rigorous quality control to ensure consistency and performance.

Paraffin Co. understands that different foundry operations have unique needs. Therefore, the company offers customized residue wax formulations tailored to specific applications and requirements. Whether for mold release, investment casting, or core binding, Paraffin Co. can provide the ideal residue wax solution.

Paraffin Co. offers technical support to its customers, helping them optimize the use of residue wax in their foundry operations. The company’s experts provide guidance on the best practices for using residue wax, ensuring maximum efficiency and quality in metal casting processes.

Paraffin Co. is committed to sustainability and environmental responsibility. The company employs eco-friendly practices in its operations, minimizing waste and reducing the environmental impact of its products. By choosing Paraffin Co. as a supplier, foundries can contribute to a more sustainable industry.


Residue wax, or foots oil, plays a vital role in metal casting and foundry operations. Its high melting point, lubricative properties, and thermal stability make it an ideal mold release agent, investment casting material, and core binder. The use of residue wax in foundries enhances mold release, improves casting quality, increases efficiency, and provides a cost-effective solution for producing high-quality metal castings.

Paraffin Co., as a leading supplier of residue wax, ensures the highest standards of quality and performance in its products. With customized solutions, technical support, and a commitment to sustainability, Paraffin Co. is the trusted partner for foundries looking to optimize their metal casting processes.

By incorporating residue wax from Paraffin Co. into your foundry operations, you can achieve superior casting results, enhance productivity, and contribute to a more sustainable industry. Discover the benefits of residue wax and elevate your metal casting processes with Paraffin Co.’s high-quality products.


You can Read More about this product Here: Residue Wax (Foots Oil)


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