Advancing Footwear Materials with Zinc Compounds #
The footwear industry relies on innovative materials to deliver products that are durable, comfortable, and sustainable. Among these materials, zinc compounds—particularly zinc oxide—play a pivotal role in the formulation of both rubber and EVA (ethylene-vinyl acetate) components used in shoe soles.
Importance of Shoe Sole Materials #
Shoe soles serve as the primary barrier between the foot and the ground, directly impacting the wearer’s comfort and the shoe’s longevity. The selection and formulation of sole materials are therefore essential considerations in footwear design and manufacturing.
Zinc Oxide in Rubber Outsoles #
The outsole, which is the bottommost layer of a shoe, must offer high wear resistance and reliable grip. Typically made from rubber, the outsole’s properties are enhanced during the vulcanization process by the addition of zinc oxide. Acting as an activator, zinc oxide accelerates vulcanization and helps fine-tune the physical characteristics of the rubber. For applications requiring transparent rubber, zinc carbonate can be used as an alternative.
Zinc Oxide as a Foaming Promoter in EVA Midsoles #
The midsole, positioned between the outsole and the foot, is typically constructed from EVA foam. This layer provides cushioning and shock absorption, contributing significantly to overall comfort. During the foaming process, a blowing agent is introduced to create the characteristic lightweight, flexible structure of EVA. Zinc oxide is added as a foaming promoter, lowering the decomposition temperature of the blowing agent for more efficient production. Additionally, it enhances the thermal conductivity of the material and helps prevent aging during high-temperature processing.
Sustainable Solutions: CS AZO® Active Zinc Oxide #
For manufacturers seeking environmentally responsible options, CS AZO® offers a sustainable alternative. This patented, eco-friendly zinc oxide utilizes innovative shell-core technology to reduce zinc content, minimize heavy metal impurities, and lower carbon emissions. Produced from recycled materials, CS AZO® supports the development of greener footwear solutions.
Selecting the Right Zinc Compound #
Choosing the appropriate zinc compound for rubber and foam formulations requires careful consideration of performance and sustainability goals. For tailored recommendations, contact Pan-Continental Chemical to discuss your specific requirements.
Zinc Compounds for Shoemaking