Food-Grade Silicone Explained: FDA, LFGB & What's Safe for Your Family

Silicone 101: The Complete Guide to Food-Grade Silicone, Testing Standards & What's Actually Safe

Everything you need to know about silicone grades, FDA vs LFGB certification, platinum-cured silicone, and how to spot the good stuff from the fakes.

If you've ever stood in a kitchen aisle or scrolled through baby tableware options, you've probably seen "food-grade silicone" stamped on everything from spatulas to sippy cups. But what does that actually mean? Is all food-grade silicone the same? What's the difference between FDA and LFGB? And how do you know if a product is genuinely pure silicone or quietly packed with fillers?

At Greenvyne, we believe informed families make better choices. So here's the honest, thorough breakdown we wish existed when we started. It covers everything from how silicone is made to the specific tests run on products like ours, to the red flags that reveal a low-quality product fast.

What Is Food-Grade Silicone?

Food-grade silicone is a synthetic elastomer (a rubber-like material) specifically manufactured and tested to be safe for direct contact with food and beverages. It sits in a different category to industrial silicone, which may contain additives, fillers, or catalysts that make it unsuitable for anything near your meals.

The key properties that define true food-grade silicone:

• Highly stable: very low chemical reactivity with food, drinks, and cleaning agents under normal conditions
• Non-toxic: free from BPA, BPS, PVC, PFAS, lead, phthalates, and other chemicals of concern
• Stable across a wide temperature range: typically from -40°C to 230°C, making it suitable for freezer to oven use
• Odour and flavour neutral: it doesn't impart taste or smell to food when pure
• Non-porous: it doesn't harbour bacteria the way plastics or wood can

Food-grade silicone is not a conventional plastic. Unlike petroleum-based plastics, its polymer backbone is built on silicon and oxygen rather than carbon, which accounts for its superior heat stability and chemical resistance. It is a synthetic polymer with some plastic-like properties, but one that performs significantly better than most plastics for food contact applications.

How Is Silicone Actually Made?

Understanding how silicone is made helps explain why quality varies so much between products and why the manufacturing process matters enormously.

Step 1: It Starts with Sand

Silicone begins its life as silica (silicon dioxide), the same mineral that makes up quartz and ordinary beach sand. It's one of the most abundant compounds on earth. Through a series of high-heat chemical reactions, silicon is extracted from silica and combined with oxygen, carbon, and hydrogen to form silicone polymers.

The primary polymer in food-grade silicone is polydimethylsiloxane (PDMS), a chain of alternating silicon and oxygen atoms with methyl groups attached. This backbone is what gives silicone its characteristic heat resistance, flexibility, and chemical stability.

Step 2: Curing (Vulcanisation)

Raw silicone polymer is soft and unusable on its own. It needs to be cured, a process that cross-links the polymer chains together to create a stable, elastic, durable material. How it's cured is one of the most important factors in the final quality of a silicone product.

There are two main curing methods used in consumer silicone products:

Peroxide-Cured Silicone An older, cheaper method that uses organic peroxide compounds as the curing agent. While the cured product can still meet food-grade standards, the peroxide curing process leaves behind chemical byproducts that must be removed, typically by post-curing at high heat. If this step is skipped or inadequate, residual peroxides can remain in the product and potentially leach into food over time. Peroxide-cured silicone is also more prone to discolouration and odour.

Platinum-Cured Silicone The premium standard. A platinum-based catalyst is used to initiate cross-linking, and it does so cleanly, without generating harmful byproducts. The platinum catalyst becomes inert in the final product, leaving nothing behind. This is the method used in medical-grade silicone and the highest quality food-grade products.

Step 3: Moulding and Finishing

Once the silicone compound (polymer + catalyst + any colourants) is thoroughly mixed for uniformity, it's placed into precision moulds and heated. The heat triggers the platinum catalyst to cross-link the polymer chains, a process called addition curing or hydrosilylation. The result is a stable, elastic silicone product that holds its shape, resists temperature extremes, and remains chemically stable over years of use.

High-quality manufacturers post-cure their silicone products in ovens after moulding to drive off any residual volatiles, even though platinum curing produces very few. This extra step is a marker of a manufacturer who takes purity seriously.

The Different Grades of Silicone

Not all silicone is equal. Here's a quick map of the landscape:

Industrial Silicone

Used in construction, automotive, and electronics applications. May contain fillers, plasticisers, or catalysts that make it wholly unsuitable for food contact. Never used in food or medical products.

Food-Grade Silicone

Meets regulatory safety standards like FDA and LFGB for contact with food and beverages. Free from chemicals of concern. Can be either peroxide-cured or platinum-cured. The term "food-grade" tells you about the end-use certification, not necessarily the manufacturing method.

Platinum-Cured Silicone

A subset of food-grade silicone, produced via the platinum-catalysed addition curing method. Considered the gold standard for food and children's products because of its superior purity, consistency, and absence of byproducts. Greenvyne uses platinum-cured silicone for 3-in-1 Stainless Steel Sippy Cup.

Medical-Grade Silicone

Held to the strictest purity and biocompatibility standards of all, regulated for use inside or on the human body (think of implants, catheters, surgical tools). Undergoes extensive cytotoxicity, sensitisation, and implantation testing under ISO 10993. Platinum curing is standard at this level. While food-grade silicone doesn't need to meet the same bar as implant-grade material, premium food-grade and medical-grade silicone share the same fundamental curing chemistry.

FDA vs LFGB: Understanding the Two Main Silicone Safety Standards

This is the question we get asked most often, and where a lot of misinformation circulates. Here's what the standards actually mean and why they're not the same thing.

FDA (U.S. Food and Drug Administration)

The FDA regulates silicone for food contact under 21 CFR (Code of Federal Regulations) Part 177.2600, which covers rubber articles intended for repeated use. To be FDA-compliant, silicone must:

• Be composed of listed, approved ingredients
• Pass extraction tests for total extractables (the amount of material that migrates into food simulants)
• Meet limits for specific substances like heavy metals

The FDA framework is based largely on a positive list approach. Manufacturers self-attest that their materials comply, and products may be sold without third-party testing. FDA-compliant certification is an important baseline, but it is not the highest possible bar.

LFGB (German Food, Commodities and Feed Code)

LFGB stands for Lebensmittel-, Bedarfsgegenstände- und Futtermittelgesetzbuch, Germany's food, commodities, and feed code. LFGB testing of silicone typically references DIN EN 13130, a series of European standards for plastic materials and articles in contact with food.

LFGB-certified silicone undergoes third-party laboratory testing. It cannot be self-certified. The tests specifically check whether substances migrate from the silicone into food simulants under real-use conditions. It uses stricter migration limits for many substances than the FDA framework, and tests are conducted with multiple food simulants representing different food types (acidic, fatty, aqueous, and alcoholic).

Refer to Greenvyne Quality and Safety page to learn more about the testing standard codes mentioned above and what we test for each material type we use.

The Key Differences at a Glance

Bottom line: Both standards confirm a product is safe for food contact. LFGB involves more rigorous, independently verified migration testing, which is why it's widely considered the higher bar and preferred for children's products specifically.

What to Expect from High-Quality, Pure Silicone

When you're working with truly pure, platinum-cured, LFGB-grade silicone, here's what you should and shouldn't experience:

You should expect:

• No smell or taste when new (a very faint, neutral scent at first wash is normal and should disappear entirely)
• Consistent colour that doesn't fade, crack, or peel with regular use
• Flexibility without tearing; it should stretch and return cleanly to shape
• No staining from most foods (though turmeric and some highly pigmented sauces can tint light-coloured silicone temporarily)
• Heat resistance without warping, melting, or becoming tacky
• Easy release from the dishwasher with a clean feel, not greasy

You should not experience:

• A strong chemical, rubbery, or petroleum smell (especially when new or heated)
• Colour that bleeds or transfers
• White residue when stretched or bent
• Tackiness that develops over time
• Deformation after dishwasher cycles

How to Spot Low-Quality Silicone with Fillers

This is where it gets important, especially for parents. A significant amount of silicone sold as "food-grade" contains silica fillers, calcium carbonate, or other cheap extenders added to reduce manufacturing costs. These fillers are not inert and can compromise both the safety and performance of the product.

Here are the tests you can do at home:

The Pinch and Twist Test

Hold the silicone firmly and pinch-twist a section of it. On pure, high-quality silicone, the colour remains consistent. It may lighten very slightly under extreme stress but will return fully. On filler-laden silicone, you'll see a distinct white or pale streak appear at the point of twisting. This is the filler being revealed as the silicone stretches beyond what its binders can hold. It's one of the most reliable at-home tests.

The Smell Test

Give the product a sniff before first use, and again after running it through a hot dishwasher cycle. Pure platinum-cured silicone has virtually no odour, perhaps a very faint, clean, neutral scent that dissipates quickly. Lower-quality silicone (especially peroxide-cured or filler-heavy products) often has a noticeable rubbery, petroleum-like, or chemical smell, particularly when heated. If you can smell it across the room, it's a red flag.

The Flame Test (With Caution)

This one is for the truly curious. Apply only to a small, concealed section if at all. Pure silicone, when briefly exposed to an open flame, will leave behind a white ash residue (silicon dioxide, essentially back to sand). Low-quality silicone with organic fillers or plastics will produce black soot or a dark residue and may drip, which are signs of carbon-based contaminants. We don't recommend doing this with any product you plan to use for food; it's more of an industry QC indicator. But it is telling.

The Price Test

Not foolproof, but worth noting: genuine platinum-cured, LFGB-certified silicone costs more to produce. If a silicone product is priced significantly below comparable items in its category, it's worth asking how those costs are being cut.

Check for Certifications

Look for LFGB certification marks, FDA compliance documentation, or third-party test reports. Reputable brands will share these. At Greenvyne, our test reports are available because we believe transparency is part of what you're paying for.

What Testing Is Done on Silicone Products?

When Greenvyne says our silicone is tested and certified, what does that actually involve? Here's a breakdown of the testing categories that food-grade and LFGB-certified silicone products undergo:

Overall Migration Testing

This measures the total amount of material that can transfer from silicone into food under specified conditions, typically using food simulants (acetic acid solution for acidic foods, ethanol for alcoholic foods, vegetable oil for fatty foods, and water for neutral foods). The result must fall below strict threshold limits (10 mg/dm² under EU standards).

Specific Migration Testing

Beyond overall migration, testing checks for specific substances of concern, including heavy metals (lead, cadmium, mercury, chromium, arsenic), residual peroxides (for peroxide-cured products), and specific organic compounds. Each has its own regulatory limit.

Sensory Testing (Organoleptic Tests)

Does the silicone impart any taste or odour to food or beverages? Trained evaluators test the product's impact on neutral water or food simulants. This is a requirement under EU Regulation 10/2011 and a key part of LFGB certification.

Mechanical and Physical Stability Testing

Products are tested under conditions that simulate real use, including repeated heating and cooling cycles, dishwasher cycles, and mechanical stress. This ensures the silicone won't degrade, crack, or change its migration profile over its useful life.

Colourant Safety

Pigments added to create coloured silicone must themselves be tested for migration and approved for food-contact use. A bright, beautiful colour means nothing if the pigment can leach into your child's food, which is why we source only food-safe pigments with their own compliance documentation.

Microbiological Safety

Silicone's non-porous surface naturally resists bacterial growth, but manufacturing cleanliness is tested to ensure no contamination is introduced during production.

FDA vs LFGB vs Medical Grade: Full Comparison Table

Why Greenvyne Uses Platinum-Cured FDA and LFGB-Certified Silicone

When we set out to build Greenvyne's range of stainless steel kids' tableware, we didn't start with "what's the minimum standard we need to meet." We started with "what would we want for our own kids?"

That answer was platinum-cured FDA Certified or LFGB-certified silicone combined with food-grade stainless steel. Here's the thinking:

Stainless steel alone is incredibly durable, but it can be cold, heavy, and hard on little mouths. Silicone softens the edges, adds grip, insulates heat, and makes products genuinely comfortable and colourful for kids to use. But only if the silicone is genuinely pure.

The combination matters. By pairing stainless steel with high-grade silicone, we solve for the weaknesses of each material. Steel gives structure and longevity; silicone alone can feel flimsy. Silicone adds comfort and colour; steel alone can be unforgiving. Together, they're products that last decades, not months.

We don't think you should have to guess. Certification documentation, test reports, and honest information should be table stakes for any brand selling products your kids eat from. That's what we're committed to.

Silicone Care Guide

Getting the most out of your silicone products is straightforward. Here's how:

• Washing: Dishwasher-safe (top rack recommended for longevity) or hand wash in warm, soapy water
• Stubborn odours: Soak in a 50/50 white vinegar and water solution for 30 minutes, then rinse
• Staining: A baking soda paste (baking soda + a small amount of water) applied and left for 15 minutes lifts most stains, turmeric included
• Drying: Air dry thoroughly before storing to prevent any moisture from being trapped
• What to avoid: Abrasive scrubbing pads, steel wool, or harsh chemical cleaners, as these can damage the surface and reduce the product's lifespan

For detailed care instructions, see our food-grade silicone cleaning and care guide.

The Bottom Line

Food-grade silicone is not a monolith. There's a meaningful spectrum between industrial-grade filler-heavy material sold as "food safe" and premium platinum-cured, LFGB-certified silicone that's been independently tested and verified. Understanding that spectrum is how you make genuinely informed choices for your family.

At Greenvyne, we land firmly at the quality end: platinum-cured, both FDA and LFGB certified, combined with food-grade stainless steel to give you the durability and purity that plastics simply can't offer. Because when it comes to what your kids eat from every day, the details matter.

Questions about our specific products, materials, or certifications? Reach out directly and we will answer them.
Forever in Use.

Disclaimer

The information provided in this blog is based on my research and understanding, drawn from articles and studies published by various industry bodies, government agencies, and credible organisations. While I have cited sources where appropriate, this blog is intended for informational purposes only and should not be considered professional or authoritative advice. Readers are encouraged to consult primary sources or qualified professionals for specific concerns or further clarification.