Innovations in rubber technology continue to drive advancements in sectors such as transportation, healthcare, and industrial machinery, making the rubber industry a cornerstone of modern manufacturing and infrastructure development. Kaolin is important ingredient in Rubber manufacturing.

Kaolin popularly known as China Clay is widely used in Rubber industry. The usage of Kaolin in Rubber industry is significant and getting popularity worldwide. As we all know that its unique properties make it valuable as reinforcing filler, processing aid, and a white pigment. Kaolin's use in the rubber industry depends on the specific requirements of the rubber product being manufactured. Manufacturers often work closely with kaolin suppliers to select the appropriate grade of kaolin to achieve the desired performance characteristics in their rubber compounds.

Why Kaolin is used in Rubber?

We at Zillion Sawa Minerals Private limited always focus on customer education. We believe that our customer not only understand the mineralogy but also know that how much time and efforts we put on R&D. To achieve this objective we frequently create blog posts which provide in-depth knowledge about minerals like Kaolin. The rubber industry uses kaolin clay for several important reasons:

  • Reinforcement: Kaolin clay acts as reinforcing filler in rubber formulations. When properly dispersed, it enhances the mechanical properties of rubber compounds. It improves tensile strength, tear resistance, and abrasion resistance, making rubber products more durable and long-lasting.

  • Processing Aid: Kaolin serves as a processing aid during the mixing and compounding of rubber compounds. It reduces the viscosity of the rubber matrix, making it easier to process and allowing for better dispersion of other ingredients. This results in improved flow characteristics during molding or extrusion processes.
  • Cost Reduction: Kaolin can be used as cost-effective filler in rubber formulations. Its availability and relatively low cost compared to other fillers make it an attractive choice for rubber manufacturers, especially when cost efficiency is a priority.
  • Whiteness and Pigmentation: Kaolin is known for its high whiteness and opacity. In the rubber industry, it is often used as a pigment to impart a white or light-coloured appearance to rubber products. This is particularly important for applications where aesthetics and visual appeal are crucial.
  • UV Resistance: Kaolin clay can provide some degree of ultraviolet (UV) resistance to rubber compounds. This is valuable in applications where rubber products will be exposed to sunlight or outdoor conditions, as it helps prevent degradation from UV rays.
  • Dimensional Stability: The addition of kaolin can improve the dimensional stability of rubber products, reducing shrinkage or deformation during vulcanization and ensuring that the final product retains its intended shape and size.
  • Insulating Properties: In some rubber applications, such as cable and wire insulation, kaolin is used to enhance the electrical insulating properties of the rubber material.
  • Improved Flow Properties: Kaolin can improve the flow properties of rubber compounds, which is beneficial in applications where precise molding or extrusion is required.
  • Reduced Gas Permeability: Kaolin can contribute to reducing gas permeability in rubber, making it suitable for applications where airtight seals or barriers are needed.
  • Chemical Resistance: In certain cases, kaolin can enhance the chemical resistance of rubber materials, protecting them from degradation due to exposure to harsh chemicals.

It's important to note that the effectiveness of kaolin in rubber formulations depends on factors like the type and grade of kaolin used, its particle size distribution, and its dispersion within the rubber matrix. Manufacturers carefully select the appropriate grade of kaolin to achieve the desired performance characteristics in their specific rubber products.

Hydrous OR Calcined Kaolin for Rubber Manufacturing

Like many other rubber manufacturer, you are also confuse in kaolin category then this section help you to understand pros and cons of using hydrous or calcined Kaolin in Rubber industry. In the rubber industry, both hydrous (hydrated) kaolin and calcined kaolin have their applications, and the choice between the two depends on the specific requirements of the rubber formulation and the desired properties in the final rubber product. Each type of kaolin offers distinct advantages:

Hydrous (Hydrated) Kaolin:


  • Hydrous kaolin is typically more cost-effective than calcined kaolin, making it an attractive choice for rubber manufacturers concerned about production costs.
  • It offers good reinforcement properties, improving tensile strength, tear resistance and abrasion resistance in rubber compounds.
  • Hydrous kaolin can enhance the process ability of rubber compounds, reducing viscosity and improving flow characteristics during mixing and molding.
  • It provides a certain degree of electrical insulation, making it suitable for some applications where this property is required.


Hydrous kaolin is commonly used in a wide range of rubber applications, including tires, conveyor belts, hoses, seals, gaskets, and various molded rubber products.

Calcined Kaolin:


  • Calcined kaolin has a higher degree of brightness, whiteness, and opacity compared to hydrous kaolin. It is often chosen when a very white or highly pigmented rubber product is desired for aesthetic reasons.
  • It offers excellent reinforcement properties, improving tensile strength and modulus of elasticity in rubber compounds.
  • Calcined kaolin has a lower moisture content, which can be advantageous in some rubber applications, especially if moisture sensitivity is a concern.
  • It is more chemically inert and has a higher resistance to heat, making it suitable for applications where thermal stability is important.


Calcined kaolin is commonly used in rubber applications where whiteness and opacity are essential, such as in the production of white or light-coloured rubber products, including shoe soles, automotive parts, and medical gloves.

The choice between hydrous and calcined kaolin ultimately depends on the specific requirements of your rubber formulation and the intended properties of the final rubber product. Rubber manufacturers often conduct trials and testing to determine which type of kaolin best meets their performance, cost, and appearance criteria for a particular application.

Kaolin from Zillion Sawa Minerals for Rubber Industry

Zillion Sawa Minerals is most reliable supplier of kaolin for rubber industry. We constantly work on product development and developed 40+ Kaolin products in all categories e.g. – Hydrous, spray dried, Meta and calcined kaolin.  We have range of rubber grade kaolin in all particle sizes, whiteness and brightness. Our key Kaolin products for Rubber industry is following –

Rubber Grade Calcined Kaolin

  • ZSM CK Super

  • ZSM CK White

  • ZSM CK Snow

  • ZSM CK Silver

  • ZSM CK Base

Rubber Grade Hydrous Kaolin

  • ZSM Shine

  • ZSM Coat 80

  • ZSM Coat 75

  • ZSM Glow

  • ZSM Gleam

  • ZSM Coat base

  • ZSM GC Powder

If you know more about technical specification and no obligation sample, then feel free to contact us. 

The Final Say!

We have tried our best to provide you in-depth knowledge about Kaolin and its usage in rubber manufacturing. However, we know that each company has its own formulation and based on that they choose rubber grade kaolin. Our customer friendly sales team always ready to assist you with your requirement. We know the importance of plant trial and hence provide you the sample quantities to process with our material. We believe in long lasting business relationship and we are sure that our product can make a difference in your manufacturing.