Silicone May Undermine UL 94 V-0 Ratings-Iota

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News > Dynamic industry > Silicone May Undermine UL 94 V-0 Ratings

Silicone May Undermine UL 94 V-0 Ratings

As solid-state battery and EV markets surge, demand for UL 94 V-0-rated potting compounds grows. Yet a common misconception persists: “Silicone is heat-resistant, so it must be flame-retardant.” Reality tells a different story.

While methyl silicones have high flash points (>300°C), they decompose under UL 94’s 600–800°C flame into volatile cyclics (D4/D5) and flammable hydrocarbons. These gases prolong burning and may cause flaming drips—failing V-0 despite a robust base resin.

Not all silicones are equal. Phenyl-modified or reactive types show better thermal stability. Crucially, final-formulation testing is non-negotiable. One electronics adhesive developer shared: “We passed V-0 with pure resin—but failed after adding 2% standard silicone oil.”

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