Q & A: Platinum Cured Silicone Rubber (120 comments)
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2025-04-04
Aisha
My entire mold is sticky, not just the surface. What happened?
This is a key diagnostic clue. If only the surface touching the master is sticky, the cause is cure inhibition. However, if the entire mass of the mold—including the top surface exposed to air—is sticky, has uncured streaks, or is soft, the problem is almost certainly operational, not inhibition. The most common causes are : 1. Incorrect Mix Ratio: The parts were not measured correctly according to the required ratio (e.g., 1A:1B by weight or volume). 2. Inadequate Mixing: This is the most frequent reason. Unmixed material, especially from the sides and bottom of the mixing container, was poured into the mold, resulting in areas that cannot cure properly.
This is a key diagnostic clue. If only the surface touching the master is sticky, the cause is cure inhibition. However, if the entire mass of the mold—including the top surface exposed to air—is sticky, has uncured streaks, or is soft, the problem is almost certainly operational, not inhibition. The most common causes are : 1. Incorrect Mix Ratio: The parts were not measured correctly according to the required ratio (e.g., 1A:1B by weight or volume). 2. Inadequate Mixing: This is the most frequent reason. Unmixed material, especially from the sides and bottom of the mixing container, was poured into the mold, resulting in areas that cannot cure properly.