Plastics are an important part of our society today, making our lives both easier and safer. Development of plastic technology continues even now, as new plastic parts become stronger, lighter, more flexible, more durable, more colorful, and even able to effectively replace traditional materials such as metal and glass.

Fillers are an integral part of these technological advances in plastics. Within this area, kaolin clays have offered many benefits to many types of thermoset and thermoplastic applications. Kaolin clays are used to improve visual appeal, strength, flexibility, electrical properties, durability, and cost to many plastics. To evaluate how your plastic materials can benefit from kaolin clay, please contact us.

Product Information

Click on the name of a product to see more specific information (requires a pdf reader).


  • SK-T 27: This product is a coarse clay with a higher aspect ratio designed for use in glass reinforced thermosets such as pultrusion profiles, sheet molding compound, and bulk molding compound. Its larger particle size and purity ensure low resin demand and the ability to aid in glass and fiver carrying and mold flow. In the curing and end use, the kaolin clay will help reducing crazing and shrinkage, and assists in moderating the exotherm.


  • SK-T 16: This product is the ideal choice for use in f-PVC applications as a TiO2 extender. SK-T 16 has demonstrated its effectiveness as a functional filler and TiO2 extender in laminated and coated fabrics. Its whiteness, brightness, and tint strength can reduce TiO2 usage by up to 25%. It is effective as a white, high opacity pigment and UV screener.
  • SK-T 13: This high aspect ratio, high surface area kaolin clay is ideal for plasticized PVC. The clay provides good rheology control to the PVC, doesn't negatively affect processing stability, reduces plasticizer migration in the final article, and is an effective white pigment. The platy nature of the kaolin clay is ideal for offering improved mechanical properties compared to other inorganic fillers. SK-T 13 can be used alone or in conjunction with SK-T 16 as a means to reduce the TiO2 loading.
  • SK-T 15: This very fine particle, high brightness kaolin clay is used in f-PVC and plastisol formulations as a white pigment, TiO2 extender, and a means to improve mechanical properties. It typically allows for a reduction in formulations cost compared to precipitated calcium carbonate and TiO2.


  • SK-T 16: This kaolin product is the workhorse of the r-PVC industry as a functional filler and TiO2 extender. Its high brightness and particle size allow for up to 25% replacement of the TiO2 in the r-PVC formulation. The SK-T 16 also allows for replacement of the PCC (precipitated calcium carbonate) with possible improvements in the mechanical properties.
  • SK-T 27: This kaolin product is designed to improve the physical properties of the r-PVC compound. SK-T 27 has a good aspect ratio and platy structure, allowing for an improvement in the physical properties of the r-PVC. It is designed to replace a portion of the GCC (ground calcium carbonate) or PCC. Its platy structure will show improvements in HDT, tensile strength, and CLTE, depending upon the loading and the other components in the formulation.
  • SK-T 49: This product is a very cost effective functional filler for r-PVC applications. It provides more reinforcement compared to GCC, and provides good whiteness and brightness. Kaolin clay is very good at screening UV light; as such, they are effective at replacing up to 25% of the TiO2 in many r-PVC applications. SK-T 49 can also be provided with a surface treatment to aid in the dispersion. However, it has been shown that kaolin clay typically disperses well into PVC without surface treatments, unlike GCC and PCC.