Slack Wax

Slack wax, a semi-refined by-product of the lubricating oil dewaxing process, exhibits various unique properties. Characterized by its variable oil content, slack wax is available in different grades, each customized for specific industrial applications. The diverse uses of slack wax range from being a primary ingredient in producing paraffin wax to serving as a waterproofing agent and lubricant in various sectors. This article is dedicated to discussing this petroleum product in detail and providing helpful insights.

JAM Group Co. is a famous provider in the global slack wax market, gaining recognition as a top-tier manufacturer. This slack wax supplier distinguishes itself by offering various slack wax grades with distinct purity levels and properties to suit diverse industrial needs. In addition to its product excellence, JAM Group Co. stands out for its competitive slack wax prices and commitment to maintaining high international standards in both product and packaging. This approach ensures that their slack wax retains its high quality from production to delivery. Furthermore, their expansive distribution network allows for efficient and timely delivery, regardless of location. For an in-depth exploration of this company, navigate to About Us.


What is Slack Wax?

Slack wax, a by-product of the oil refining process, emerges during the production of lubricating oils. Its composition—a mix of oil and wax—varies depending on its source, with oil content potentially reaching up to 40%. This petrochemical product, brown in color and high in viscosity, undergoes chilling and solvent filter-pressing to be extracted from the wax distillate. It has a crucial role as a feedstock for various waxes, primarily in creating different grades of paraffin. Though it shares specific properties across its grades, slack wax differs significantly from its refined counterpart, paraffin wax.

Although it does not typically meet FDA standards for food packaging, slack wax finds its utility in non-food-related industrial applications. With melting points ranging from 50°C to 55°C, slack wax is classified into light and heavy grades, corresponding to its oil content and physical properties. This translucent crystalline material solidifies at room temperature but becomes a clear, yellow liquid when heated, demonstrating its versatile physical characteristics.

Slack Wax Properties

Regarding slack wax specification, it is essential to note its varied properties, such as oil content, melting point, and color, determining its suitability for different industrial uses. You can read more about it in the following section.

  • Water Resistance: When applied to surfaces or gaps, slack wax acts as an effective barrier against moisture. This quality is due to its unique molecular structure, making it a reliable choice for waterproofing in various applications.
  • Thermal Insulation: Recognized for its ability to limit heat transfer, slack wax is frequently used in textiles and other industries where temperature control is essential. Its high heat capacity ensures efficiency in trapping heat within designated spaces.
  • Electrical Insulation: Slack wax’s insulating properties are invaluable in electronics. It can be used to coat circuit boards and surfaces, safeguarding electrical systems from potential hazards.
  • Lubrication: The lubricating function of slack wax is crucial across many industrial sectors. It reduces friction and associated heat between moving parts, enhancing the efficiency and lifespan of machinery.
  • Low Density: Slack wax’s lightweight nature allows its integration into systems without significantly increasing the overall weight. This aspect is particularly beneficial in industries where weight management is a priority.
  • Melting Without Decomposition: Its ability to melt without breaking down chemically expands its use in various industrial processes requiring thermal manipulation.

Moreover, it is helpful to note that the slack wax hs code, which is 27129030, is a standardized code used for its international trade classification. For safety and handling, the slack wax MSDS (Material Safety Data Sheet) provides crucial information, including hazard identification, composition, and first-aid measures.


Different Grades of Slack Wax

Slack wax, known for its versatility, is classified into various grades based on several key factors:

  • slack Wax Composition:

The oil content in slack wax is a primary determinant of its grade. Different grades contain varying amounts of oil, influencing their texture, consistency, and applications.

  • Chemical Properties:

Density: The density of slack wax varies across grades, affecting its heaviness and suitability for specific uses.

Congealing Point: This indicates the temperature at which the wax transitions from liquid to solid, and it varies among grades.

Flash Point Open: A critical safety measure, this property signifies the temperature at which the wax emits vapors that can ignite in the air.

Viscosity: The thickness or fluidity of the wax is a crucial factor in determining its grade and usability in different contexts.

Melting Point: Grades of slack wax are also differentiated by their melting points, which divide them into light and heavy categories. Light grades melt at lower temperatures than heavy slack wax.

  • Physical Properties:

The color of slack wax can range from light yellow to darker hues, depending on the grade and refining process.

  • Final Application:

Each grade of slack wax is customized for specific applications, determined by the combined effect of its composition, chemical, and physical properties. This alignment ensures optimal performance in its intended use.

Next, we will present some of the famous grades of slack wax in the market. But before that, it seems helpful to note that each slack wax manufacturer may name these grades using different titles; still, they share their properties and composition.

Grade No. 1

The first grade of slack wax has distinct properties and composition, making it suitable for specific applications. This grade exhibits a density of 810 kg/m3 at 15.6 °C, positioning it as a relatively lightweight wax in the industry. Its congealing point, the temperature at which it solidifies, is 60 °C, which indicates its stability and usability in environments with moderate temperatures. A notable feature of this slack wax grade is its flash point, recorded at 240 °C. This high flash point ensures it can withstand significant heat before vaporizing, enhancing its safety in high-temperature applications. The oil content of this grade is maintained between 5% to 8% by weight, contributing to its smooth texture and manageable viscosity.

Speaking of viscosity, at 100 °C, this slack wax exhibits a range of 5.5 to 7.5 CST. This measurement of its resistance to flow at higher temperatures underlines its versatility and efficiency in applications requiring a balance between fluidity and stability.

Grade No. 2

This grade is distinguished by a unique set of characteristics that define its suitability for various industrial applications. Its density ranges from 810 to 840 kg/m^3 at 15.6 °C. This slight increase in density compared to the first grade indicates a robust structure, making it suitable for denser wax applications. Like the first grade, it has a congealing point of 60 °C, suggesting its solidification occurs at moderate temperatures. This consistent property across grades ensures reliability in environments where temperature stability is essential.

An important aspect of this grade is its oil content, which lies between 8% to 10% by weight. This higher oil content than the first grade offers a slightly softer texture and potentially more flexibility in applications that demand a wax with more pliability. The flash point of the grade No.2 remains the same as the first, at 240 °C. This high flash point is critical for maintaining safety standards, particularly in high-temperature processes. Regarding viscosity, the second grade maintains the range of 5.5 to 7.5 cSt at 100 °C. This consistency in viscosity, even with different oil content, showcases its ability to balance fluidity and stability under varying temperatures.

Grade No. 3

The third grade of slack wax exhibits distinctive properties and composition, setting it apart from its predecessors. This grade has a density of 0.8355 kg/m^3 at 15.6 °C, indicating a slightly heavier and denser constitution than the earlier grades. Such a density enhances its utility in applications where a more substantial wax is preferred. This grade’s congealing point is slightly higher at 61.8 °C, suggesting it remains liquid longer than the first two grades before solidifying. This characteristic could be advantageous in processes requiring a longer wax duration in its fluid form. A notable feature of the third grade is its flash point, which is higher at 250 °C. This elevated flash point contributes to enhanced safety, especially in environments exposed to high temperatures, by reducing the risk of ignition.

The oil content in this grade is around 12% by weight, marking a noticeable increase from the previous grades. This higher oil concentration imparts a softer texture and increased malleability, making it suitable for applications where a more pliable wax is beneficial. Viscosity is also a defining feature, with this grade showing a viscosity of 6.33 cSt at 100 °C. This specific viscosity level, combined with its other properties, makes this grade of slack wax ideal for specialized uses that require a unique balance of density, thermal properties, and malleability.


Slack Wax Production Process

The processing of slack wax holds significant importance, as it directly influences the composition and properties of the final product. Each stage of the process plays a crucial role in defining the characteristics of slack wax. These characteristics are chemical compositions and include physical properties like melting point, oil content, and viscosity. As we dive into the various stages of how to make slack wax, it becomes evident how they contribute to the final grading of slack wax.

Distillation of Crude Oil

The initial stage in the production of slack wax is the distillation of crude oil, a process fundamental to separating the complex mixture into various valuable components. In a refinery, crude oil is first heated in a distillation column at high temperatures. This heating causes the oil to vaporize and ascend through the column, where it encounters trays at different levels, each set at varying temperatures. As the vapor rises, its temperature decreases, and different fractions of the crude oil condense back into liquid at these trays based on their specific boiling points. Among these fractions is the one for lubricating oils, which is crucial for the next steps in slack wax production.

Still mixed with waxes, this fraction is extracted and directed towards further processing. The precision in controlling the temperature at each tray ensures that the separation is efficient and that the lubricating oil fraction is of the desired quality.

Refining to Produce Lubricating Oil

Following the distillation of crude oil, refining the lubricating oil fraction is the next crucial phase in producing slack wax. This stage is dedicated to enhancing the quality of the oil and eliminating unwanted impurities, including waxes. During this process, the fraction earmarked for lubricating oil undergoes rigorous treatment to purify and stabilize it. This treatment might involve methods like hydrodesulfurization to remove sulfur compounds, or hydrogenation to reduce unsaturated hydrocarbons.

Additionally, the wax, inherently present in this fraction, must be separated to ensure optimal performance of the lubricating oil, particularly under varying temperature conditions. This separation is achieved through solvent extraction or chilling processes, where waxes are crystallized and removed. The refinement ensures the lubricating oil meets specific quality standards and effectively isolates the slack wax, setting it aside for further processing or direct use.

Dewaxing of Lubricating Oil

The dewaxing of lubricating oil is a vital phase in the production of slack wax, where the essence of the process lies in the careful temperature management to precipitate wax from the oil. The refined lubricating oil, obtained after the initial distillation, is cooled during this stage. This controlled cooling is crucial as it influences the waxes’ behavior in the oil. As the temperature lowers, the waxes, initially dissolved in the oil at higher temperatures, begin to solidify and form crystals. These wax crystals have different physical properties than the oil, enabling them to be separated efficiently.

The cooling is carefully monitored to ensure that the maximum amount of wax precipitates without compromising the remaining oil’s quality. This separate wax, which still contains a considerable amount of oil, is known as slack wax. The finesse of this dewaxing process determines the yield and quality of the slack wax and ensures that the remaining lubricating oil retains its desired properties for further industrial applications. Thus, dewaxing serves as a critical bridge in slack wax production, balancing the removal of waxes while preserving the integrity of the lubricating oil.

Slack Wax Collection

The collection of slack wax is another vital step in its production process, following the critical dewaxing of lubricating oil. During dewaxing, the oil is cooled, leading to the precipitation of wax. This wax, now separated from the oil, is what we know as slack wax. Characteristically, slack wax is less refined and contains a higher oil content than more processed waxes like paraffin. This particular stage is crucial as it captures the essence of slack wax’s utility – its natural, semi-refined state. The collected slack wax, rich in oil, offers unique properties, making it suitable for diverse industrial applications.

Optional Further Refinement

Upon collection, petroleum slack wax, which is less refined and has a higher oil content, presents an opportunity for further refinement. This optional step tailors the wax to specific requirements, reducing its oil content and changing its physical properties for diverse applications. During this phase, the slack wax undergoes additional processing techniques, such as solvent extraction, hydrotreating, or clay contact methods. These methods are applied to extract excess oil and impurities, enhancing the wax’s quality and purity.

The outcome of this refinement can vary, producing different types of waxes like fully-refined paraffin wax, which boasts a lower oil content and a more consistent texture, suitable for applications requiring higher purity and specific melting points.


Slack Wax Applications

Due to its distinct composition and versatile properties, slack wax serves various roles across different industrial sectors. This material, rich in oils and unique texture, lends itself to a spectrum of uses, from its efficacy in waterproofing materials to its vital role in candle-making. In the following paragraphs, you can find out more about slack wax uses and its details.

In the Production of Paraffin Wax

In the journey from slack wax to paraffin, a significant transformation occurs, primarily through the process of de-oiling or de-waxing. This step is integral to extracting oil from slack wax, a compound rich in carbon-alkanes. During dewaxing, oil is carefully removed from the slack wax, primarily via crystallization, a process that harnesses the distinct physical properties of wax and oil. This purified slack wax then serves as a foundational raw material in the paraffin manufacturing process. Additional steps like purification, staining, and bleaching are employed throughout this transformation to refine the wax further. These procedures are crucial in achieving various grades of paraffin wax, each suited to specific applications such as candle making.

In the Textile Industry

Slack wax emerges as a vital ingredient in this sector, particularly for enhancing the thermal insulation properties of fabrics. By transforming paraffin, slack wax finds its application in coating various textiles. This coating process is not just a routine step; it’s an essential measure for fabrics that must meet specific functional requirements. The application of paraffin on textiles serves a dual purpose: it acts as a barrier against heat loss, thereby retaining warmth and simultaneously protecting against cold. This attribute makes paraffin-coated textiles an ideal choice for garments or materials that demand higher thermal regulation.

As a Lubricant

Slack wax plays a role in the PVC industry, chiefly as a lubricant. Its unique properties make it an ideal candidate for this purpose. In PVC production, the blending of slack wax helps reduce friction during the manufacturing process, facilitating smoother operation and extending the life of machinery. The inherent characteristics of slack wax, such as its viscosity and oil content, provide the right balance of lubrication without compromising the quality of the PVC.

As a Fine Dust Suppressant

Slack wax finds a unique and practical application as a fine dust suppressant, a role that leverages its inherent properties for environmental management. In areas where fine dust particles pose a health or environmental hazard, such as in construction sites, mines, or unpaved roads, slack wax can be applied to bind these particles and reduce their airborne nature. Its effectiveness lies in its ability to create a light coating over the dust, which helps settle the fine particles and prevents them from being easily dispersed by wind or vehicle movement.

In Waterproofing Industry

Slack wax is also a highly versatile and effective waterproofing material. Its intrinsic water-repellent properties make it an excellent choice for a variety of waterproofing applications. For instance, slack wax is often used to produce waterproof coatings for fabrics, outdoor gear, and construction materials. Its ability to create a barrier that prevents water penetration while maintaining the material’s breathability is precious in outdoor and marine applications. Moreover, the adaptability of slack wax allows it to be combined with other compounds to enhance its waterproofing efficacy and to suit the specific requirements of different materials and surfaces.

As A Blending Agent

Slack wax is an effective blending agent, particularly in crafting petrolatum and microcrystalline waxes. This application capitalizes on slack wax’s unique characteristics, such as its malleable texture and variable oil content. It is an ideal component for achieving the desired consistency and properties in the final wax products. When blended with other waxes, slack wax helps adjust the melting point, viscosity, and texture, tailoring these products to specific industrial requirements.

Other Industrial Applications

In industrial manufacturing, slack wax stands out for its multifaceted applications, extending far beyond its traditional uses. Distinct from paraffin wax, slack wax is a vital ingredient in many products, ranging from candles and building boards to rust preventives and moisture vapor insulators. Its utility is also evident in producing inks, lubricants, greases, adhesives, and personal care items. In addition, slack wax helps create carbon paper and dust-insulating materials, playing a vital role in controlled release technologies across various industries.


About JAM Group Co’s Slack Wax

JAM Group Co. has established itself as a formidable global slack wax market force. Renowned among slack wax manufacturers, the company offers diverse grades of slack wax, each with specific purity levels and unique properties. These variations enable their slack wax to be effectively utilized in many industrial sectors. Their product range is carefully designed to meet the varying demands of these industries, ensuring that each grade of slack wax they offer serves its intended purpose effectively. This adaptability and attention to detail have positioned JAM Group Co. as a preferred supplier for businesses seeking quality and reliability in slack wax products.

In terms of distribution and accessibility, JAM Group Co. offers slack wax in various forms, accommodating different industrial needs and packing preferences. They adhere to international standards in both product quality and packaging, ensuring that their slack wax maintains its integrity from manufacturing to delivery. Moreover, the company’s global logistics network facilitates a variety of shipping options, underlining its commitment to reliability and customer satisfaction. Whether local deliveries or international shipping, customers can count on JAM Group Co. for a timely and efficient supply of slack wax, making them a trusted name among slack wax suppliers, including prominent markets like India and Iran. Their approach to distribution, combined with competitive slack wax prices, cements their status in the slack wax market, appealing to a broad range of customers worldwide. Click on About Us and read more about the company.



Slack wax, a lesser-refined byproduct emerging from the dewaxing process of lubricating oils, presents a unique blend of properties and varied grades. Its oil content, determining its grade, varies, making it adaptable to diverse industrial needs. The journey of slack wax begins in the refinery, where crude oil undergoes distillation, leading to the extraction of lubricating oil fractions. These oils, when dewaxed, yield slack wax, which can be further refined or used as is. Its applications are vast, spanning from being an essential raw material in the production of paraffin wax to serving in waterproofing and as a lubricant in different sectors. Each grade of slack wax has been modified to meet specific industry requirements, showing its versatility and indispensability in various manufacturing processes.