Materials
How to Source Body-Safe Silicone Products
Why 'Silicone' Alone Is Not a Material Safety Claim
Silicone is a family of silicon-oxygen polymers, not a single material, and the word alone tells a buyer nothing about safety. A product labeled simply 'silicone' could be peroxide-cured industrial rubber or platinum-cured medical-grade elastomer, and the two behave very differently on skin. The Wikipedia entry on Silicone describes a broad polymer class whose properties change with formulation. For a body-contact wellness product, the only meaningful question is which grade, which cure system, and which test report backs the claim.
Platinum-Cured vs Peroxide-Cured: What the Grade Actually Controls
Platinum-cured (addition-cured) silicone uses a platinum catalyst and leaves behind almost no volatile byproducts, which is why it is the default for medical and food-contact applications. Peroxide-cured silicone is cheaper and fine for industrial parts, but it can retain curing residues that contribute to odor and extractable content. For an intimate wellness product, specify platinum-cured liquid silicone rubber (LSR) and get the cure system confirmed in writing — a phrase like 'medical-grade silicone' without the cure system is a claim, not a specification.
How to Read Shore Hardness and Dual-Density Specifications
Firmness is measured on the Shore A scale. A soft external sleeve might sit around Shore 00-10 A, a firmer insertable core around 20-40 A, and a rigid ABS frame well above that. Dual-density products combine a soft outer layer with a firmer internal core for structure — a common premium construction for private label devices. Specify the hardness of each layer separately, with a tolerance of about ±2 Shore A, because a supplier quoting one blended number for a dual-density product is hiding where the variance lives.
What 'Medical-Grade' and 'Food-Grade' Actually Mean for Buyers
Neither 'medical-grade' nor 'food-grade' is a precise global certification by itself — they are shorthand for silicone formulated and tested against a specific standard. Food-contact claims reference frameworks such as FDA 21 CFR 177.2600 or the EU food-contact material regulation, while medical-grade implies biocompatibility testing under ISO 10993. For an adult wellness product the more useful question is which test report the supplier can produce: an ISO 10993 cytotoxicity or sensitization report tells you far more than a marketing label.
The Three Documents Every Silicone Sourcing Brief Must Include
Before approving a sample, ask for three linked documents: a certificate of analysis (COA) for the raw silicone batch, a material safety data sheet (MSDS/SDS), and a test report naming the finished product or its material formulation. The COA and MSDS describe the raw polymer only — pigments, additives, and overmolding introduce their own risks. The Wikipedia entry on Silicone rubber notes that fillers and additives substantially change final properties, so the report must cover the actual formulation, not a generic grade.
How to Spot Incomplete Cure, Odor, and Contamination in a Sample
A tacky surface, a lingering chemical smell, or visible residue usually signals incomplete cure or a volatile additive, not a 'new product' smell. Apply a simple standard: after 24-48 hours of airing, there should be no solvent or chemical odor. Check for dust attraction, uneven gloss, and seam flash, and ask how the supplier controls contamination at the packing line — gloves, clean benches, and air blowing before bagging. These details separate a controlled factory from an uncontrolled one.
Why ISO 10993 Biocompatibility Matters More Than a Marketing Label
ISO 10993 is the international series for evaluating the biocompatibility of materials that contact the body. For a skin- or mucosa-contact device, a supplier that can show an ISO 10993 cytotoxicity and sensitization report has actually demonstrated biological safety rather than asserting it. Pair this with phthalate limits (commonly ≤0.1%) and REACH/RoHS evidence, because a base-polymer certificate does not prove the finished device is safe. The ISO 3533:2021 standard for sex toys makes the same point, treating material and biological safety as a first-priority requirement.
How Silicone Choice Interacts With Packaging and Shelf Life
Silicone surfaces attract dust and can take compression marks, so packaging matters for the same reasons the material does. A premium silicone device shipped in a loose polybag will arrive scuffed or dusty, undercutting the safety story you just built. Specify a tray or formed insert that holds the product without contact pressure, a protective inner bag, and a manual that states compatible lubricant and cleaning guidance. The material and the packaging are one decision, not two.
The Silicone Audit Questions That Separate a Real Factory
Ask the supplier to walk through its silicone supply chain: who compounds the LSR, how batches are traced to finished cartons, how color is matched and verified, and how hardness is checked by shift or lot. A real factory answers with lot numbers and durometer records; a trading company reschedules. Confirm whether silicone molding is in-house or subcontracted, because a factory that outsources molding has less control over the exact material risk you are trying to eliminate. For the broader quality picture, apply the same quality evaluation discipline to the material as you would to the finished device.
Frequently Asked Questions
What is the difference between platinum-cured and peroxide-cured silicone?
Platinum-cured (addition-cured) silicone uses a platinum catalyst and leaves almost no volatile byproducts, making it the default for medical and food-contact use. Peroxide-cured silicone is cheaper but can retain curing residues that cause odor and higher extractables. For body-contact wellness products, specify platinum-cured LSR and get the cure system confirmed in writing.
Does 'medical-grade silicone' mean the product is automatically safe?
No. 'Medical-grade' is shorthand, not a certificate. The useful evidence is a biocompatibility test report such as ISO 10993 cytotoxicity or sensitization, plus phthalate limits and REACH/RoHS evidence. Ask for the report that names the finished formulation, not a generic grade.
What Shore A hardness should I choose for an adult wellness product?
It depends on the layer. A soft outer sleeve is often around Shore 00-10 A, a firmer insertable core around 20-40 A, and a rigid frame higher. For dual-density products, specify each layer separately with a tolerance, typically ±2 Shore A.
How can I tell if a silicone sample is properly cured?
A tacky surface, lingering chemical smell, or visible residue suggests incomplete cure or volatile additives. After 24-48 hours of airing there should be no solvent odor. Check for dust attraction, uneven gloss, and seam flash, and ask how contamination is controlled at the packing line.
What documents should I request before approving a silicone product?
Ask for a certificate of analysis for the raw batch, an MSDS/SDS, and a test report covering the finished formulation. The COA and MSDS describe the raw polymer only; pigments, additives, and overmolding need their own coverage.
Why does packaging matter for a silicone product?
Silicone attracts dust and can take compression marks. A tray or formed insert that holds the product without pressure, a protective inner bag, and clear cleaning and lubricant guidance protect the surface finish and the safety story through shipping and storage.
References
- Wikipedia — Silicone
- Wikipedia — Silicone rubber
- ISO 10993-1:2018 — Biological evaluation of medical devices, Part 1: Evaluation and testing within a risk management process
- ISO 3533:2021 — Sex toys — Design and safety requirements for products in direct contact with genitalia, the anus, or both
- Ratner, B. D., Hoffman, A. S., Schoen, F. J., & Lemons, J. E. (2012). Biomaterials Science: An Introduction to Materials in Medicine, 3rd edition. Academic Press.
Certifications by target market
| Market | Required certifications | Status |
|---|---|---|
| EU | CE (LVD + EMC + RoHS), RED (wireless) | Held |
| US | FCC (Bluetooth/wireless), Prop 65 material docs | Supported |
| UK | UKCA marking | Held |
| Japan | PSE (rechargeable electrical) | Held |
| Australia | RCM mark | Supported |
| All markets (air freight) | UN38.3 lithium battery | Held |
| All markets | IEC 62133 battery safety | Held |
Documents VOVOHO provides
| Document | Purpose |
|---|---|
| CE Declaration of Conformity | EU import compliance |
| RoHS test report | Substance compliance (EU / UK / Asia) |
| UN38.3 certificate | Lithium battery air shipment (DHL/FedEx/UPS) |
| IEC 62133 battery test report | Battery safety |
| Material safety / FDA material docs | US market / retailer requirements |
| Packing list & commercial invoice | Customs clearance |
| Product specification sheet | Buyer internal use |
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