EVA
Shoes
Zinc compounds are widely used in the footwear industry, especially for producing shoe soles. As the physical barrier between the foot and the ground, shoe soles have a large impact on the durability and comfort of a shoe. Formulating and producing a suitable material for the sole is therefore critical.
The Role of Zinc Oxide in Rubber Outsoles
Shoe soles can be further divided into the outsole and midsole. The outsole is the layer on the very bottom of the shoe. It is in direct contact with the ground, so the material must have high wear resistance and good grip. In general, it will be made from rubber. During the vulcanization process for rubber soles, zinc oxide is added as an activator to speed up the reaction and adjust the final physical characteristics. Zinc carbonate can be used instead if transparent rubber is desired.
Zinc Oxide as a Foaming Activator in EVA
The midsole is the thick foam layer between the foot and the outsole. It serves as a cushion to absorb shock and ensure comfort. This layer is often made from EVA foam – lightweight, with good cushioning and flexibility. When turning EVA into a foam, a blowing agent is added, which decomposes and forms gas bubbles at high temperatures and pressure. Zinc oxide is added as a foaming promoter: it lowers the decomposition temperature of the blowing agent for easier production. It also improves the thermal conductivity of shoe materials and prevents aging under high-temperature processes.
Sustainable Zinc Oxide for Eco-Friendly Footwear
Environmentally friendly alternatives for the above are available as well. Our patented CS AZO is a sustainable, eco-friendly, and environmentally friendly new type of zinc oxide. It utilizes innovative shell-core technology to achieve zinc reduction, low heavy metal content, and low carbon emissions. Additionally, it is produced using recycled materials, contributing to the development of green zinc oxide for a sustainable planet.
Additionally, it is produced using recycled materials, contributing to the development of green zinc oxide for a sustainable planet.
Find the Right Zinc Compound for Your Footwear Needs
There are many considerations when selecting a zinc compound for rubber and foam formulations. Get in touch with Pan-Continental Chemical to find the right choice for you.
