Oil Seepage, Stickiness on Food-Grade Silicone: Causes & Solutions
Oil Seepage, Stickiness on Food-Grade Silicone: Causes & Solutions
Ever noticed oil seepage, surface stickiness or oil leakage on your food-grade silicone? It all comes down to small-molecule silicone oil seeping out—and there are a few common reasons for this!
1. Raw Material & Formulation Hiccups
Low-quality silicone uses cheap base oil and filling oil, which are high in small-molecule silicone oil. These oils don’t hold up well to heat and don’t mix well with the silicone—so over time, they seep out and leave that greasy feeling you might have noticed.
Incomplete curing is another culprit! If you mix the silicone and curing agent wrong, don’t stir it well, use it in too-cold conditions, or take it out too soon, the silicone won’t bond properly. Those unreacted small molecules then migrate to the surface, causing oil seepage.
2. Improper Processes & Too Many Additives
Adding too much silicone oil, internal mold release agent, or plasticizer might make the silicone softer and easier to take out of the mold—but too much of a good thing causes those extras to seep out. This is extra noticeable with food-grade silicone, too!
Your usage environment also speeds up oil seepage! Leaving silicone in long-term high temperatures, direct sunlight, or heating it repeatedly breaks down its molecular structure, making those small molecules seep out faster. Using it with oily foods can make the problem worse, too.
3. Aging & Wear
Like most things, silicone ages over time! After lots of use, it hydrolyzes, and its big molecules break down into smaller ones—this is what causes oil seepage, stickiness, and even yellowing.
Easy Fixes to Try!
It’s simple to cut down on oil seepage: use regular, high-quality food-grade silicone, mix and cure it properly, avoid using it in high temperatures for too long, and replace old, worn molds on time.
Follow Jiajinghong Silicone for more easy-to-understand silicone tips and info!
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