Poisoning of platinum curing silicone

In this article, we delve into the world of silicone poisoning, focusing on addition-curing silicones (also known as platinum silicones). We also explore the concept of inhibition in relation to this type of poisoning.

  1. Addition-Curing Silicones:

    • These silicones undergo polymerization to harden. Short silicone molecules form long chains and networks, resulting in rubber-like silicones.
    • Platinum acts as a catalyst in this process. Due to its high cost, platinum is added sparingly.
    • Unfortunately, platinum also reacts with other components. If insufficient platinum remains, the silicones may not fully cure.
    • The result? Sticky or even liquid silicones with less tensile strength and firmness than expected due to incomplete network formation.
  2. Materials That React with Platinum and Poison Addition Silicones:

    • Sulfur: Sulfides and their combinations (found, for example, in latex gloves). Always check your gloves!
    • Nitrogen: Amines, amides, nitriles, and cyanates (present in epoxies, paints, and adhesives). Even if an epoxy or paint appears fully cured, there’s a significant chance it isn’t.
    • Tin: Tin salts and similar compounds (commonly used in condensation silicones).
    • Phosphorus: Phosphine and phosphite (used in the metal industry for corrosion protection).
    • Other Substances: Solvents like alcohols and esters, as well as certain unsaturated compounds and primers.
  3. Condensation Silicones:

    • These silicones often use a tin compound as a catalyst.
    • They usually cure unless there’s insufficient moisture in the air or system, or if moisture is drawn out (e.g., in very dry river clay).

Note: Avoid exposing silicones to toxic substances, clean surfaces before application, and use appropriate primers to prevent inhibition. For more details, refer to the full document here.

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