Food Grade vs. Medical Grade: Decoding Silicone Standards for Lunch Boxes

Collapsible silicone lunch boxes are a staple in the sustainable corporate gifting catalog. They are convenient, space-saving, and colorful. But not all silicone is created equal. As a Quality Assurance Engineer, I frequently encounter products labeled simply as 'Food Grade Silicone'. In the global market, this term is ambiguous. There are two primary standards: FDA (US Standard) and LFGB (European Standard). The difference between them is not just paperwork; it's chemistry.

FDA-approved silicone is the baseline. It is safe for food contact but is often cured using peroxides. If not properly post-cured, peroxide byproducts can remain, potentially leaching into food at high temperatures or imparting a subtle chemical odor. LFGB (Lebensmittel-, Bedarfsgegenstände-und Futtermittelgesetzbuch) standards, primarily used in Germany and Europe, are far stricter. LFGB silicone typically requires Platinum Curing. This process uses a platinum catalyst, which leaves no toxic byproducts, results in a clearer, more durable material, and has zero odor or taste transfer.

The 'Pinch Test'

How can a procurement manager tell the difference without a lab? The simplest method is the 'Pinch Test'. Take a silicone product and pinch or twist a flat surface. If the silicone turns white at the stress point, it likely contains fillers (often plasticizers to reduce cost) and is likely standard FDA grade or lower. Platinum-cured LFGB silicone will not turn white; it remains a consistent color throughout the twist.

For corporate gifts intended for hot food—like soup containers or coffee cups—we strongly recommend specifying LFGB or Platinum Grade silicone. While it costs approximately 15-20% more, the difference in user experience is palpable. There is no 'plastic taste' in the coffee, and the material doesn't become sticky over time. In the context of brand reputation, ensuring your logo is on a product that is chemically inert and safe is worth the premium.

Question: Is silicone plastic?

No, silicone is a synthetic rubber polymer derived from silica (sand), whereas plastic is derived from petroleum. While it is not biodegradable, it is considered more ocean-friendly than plastic because it does not break down into microplastics. It is also highly durable and heat resistant, making it a safer alternative for food storage.