The selection of the appropriate curing agent is one of the most critical decisions in silicone product manufacturing. Two dominant curing methods – platinum curing and peroxide curing – offer distinct advantages and disadvantages, catering to different application needs. NINGBO INNO PHARMCHEM CO.,LTD. provides expertise and products for both, but highlights the growing importance of platinum curing agents for advanced applications.

Peroxide Curing: The Traditional Workhorse

Peroxide curing, also known as free-radical polymerization, has been the traditional method for vulcanizing silicone rubber. It involves using organic peroxides that decompose under heat to generate free radicals. These radicals initiate a cross-linking reaction, forming a solid elastomer. Peroxide-cured silicones are generally:

  • Cost-Effective: The raw materials and processing are typically less expensive, making them a popular choice for general industrial applications.
  • Robust Mechanical Properties: They often exhibit excellent compression set, which is vital for long-term sealing applications, and good mechanical strength.
  • Processing Flexibility: Less sensitive to inhibitors, offering broader processing windows.

However, peroxide curing has limitations. The process can leave residual byproducts, which may lead to odor, discoloration, and potential migration issues, making them less suitable for medical or food-contact applications without extensive post-curing. Manufacturers might inquire about the price of peroxide curing agent for cost-sensitive projects.

Platinum Curing: The High-Performance Solution

Platinum curing, or addition curing, utilizes a platinum catalyst to drive the reaction between vinyl and Si-H groups. This method is favored for applications demanding the highest standards of purity and performance:

  • Exceptional Purity: The absence of harmful byproducts makes them ideal for medical, food-grade, and sensitive electronic applications.
  • Superior Performance: Platinum-cured silicones offer better heat stability, improved mechanical properties (tensile strength, tear resistance), and often better clarity.
  • Faster Cure Times: Many platinum systems offer faster cure cycles, boosting production efficiency.
  • Controlled Reactions: While sensitive to inhibition, platinum systems allow for precise control over cure kinetics.

The primary drawback of platinum curing is its higher cost, both for the catalyst and potentially for more controlled processing environments. However, for many advanced applications, the benefits far outweigh the added expense. When buying platinum curing agent, it’s crucial to partner with a reputable supplier like NINGBO INNO PHARMCHEM CO.,LTD.

Choosing the Right Agent

The decision between platinum and peroxide curing depends on the specific application requirements:

  • For general industrial seals, gaskets, and non-critical components where cost is a major factor, peroxide-cured silicone might suffice.
  • For medical devices, food contact products, high-temperature automotive parts, sensitive electronics, or applications demanding superior purity and longevity, platinum-cured silicone is the preferred choice.

NINGBO INNO PHARMCHEM CO.,LTD. offers a comprehensive range of curing agents and technical support to help manufacturers select the optimal solution for their silicone products, ensuring both performance and compliance.