A part is medical grade when three conditions are met together: the material is biocompatible and tested to ISO 10993, it is molded under an ISO 13485 quality management system, and production happens in a controlled (often cleanroom) environment with full traceability. Medical grade is a system, not just a material label. A certificate on the raw silicone is necessary but not sufficient on its own.
Five frameworks do most of the work. The table summarizes what each one covers and why buyers ask for it.
|
Standard |
Covers |
Why it matters |
|
ISO 10993 |
Biological evaluation / biocompatibility |
Current global, risk-based framework recognized by FDA |
|
USP Class VI |
Biological reactivity (legacy test) |
Still referenced; often insufficient alone today |
|
FDA 21 CFR 177.2600 |
Rubber for repeated food/contact use |
Establishes compliant elastomer formulations |
|
ISO 13485 |
Quality management for medical devices |
Ensures process control and traceability |
|
Cleanroom (ISO 14644) |
Air cleanliness class (e.g., ISO 7) |
Limits particulate / microbial contamination |
ISO 10993 is the standard to rely on. USP Class VI is a useful, well-known screening test, but FDA guidance now emphasizes that it is often insufficient on its own for modern biocompatibility evaluation. ISO 10993 is a comprehensive, risk-based framework spanning more than 20 standards that assess how a device interacts with the body, matched to contact type and duration. For most patient-contact devices, expect to provide ISO 10993 endpoint data or a master-file reference, with USP Class VI as supporting evidence.
Because contamination is a defect you usually cannot inspect away. Cleanroom production reduces particulate and microbial contamination during molding and packaging, which directly affects bioburden and patient safety. Many patient-contact and implant-grade parts are molded in controlled environments such as ISO Class 7 cleanrooms, with gowning, filtered air, and segregated material flow. The cleaner the contact application, the tighter the environment required.
Medical silicone is chosen partly because it tolerates the common sterilization methods without degrading. Validated routes include:
Properly formulated medical LSR keeps its mechanical properties across these methods, but the specific grade and any post-cure must be validated for the chosen route. Low extractables and leachables are essential so nothing harmful migrates into the patient or the drug pathway.
Compliance lives or dies on paperwork. For every relevant shipment, a credible medical molder supplies:
TYM builds LSR injection molding machines, precision silicone molds, and turnkey automated systems configured for medical production, including cleanroom-adaptable machine designs, high-accuracy metering for stable A:B ratio, and even mold temperature control for repeatable cure. TYM works with biocompatible LSR grades and supports documentation and validation workflows so medical manufacturers can meet ISO 13485, ISO 10993, and FDA 21 CFR 177.2600 requirements with confidence. The emphasis is precise, efficient, intelligent manufacturing built for regulated environments.
A: Food-grade silicone meets food-contact rules such as FDA 21 CFR 177.2600 and LFGB. Medical-grade silicone goes further: it adds biocompatibility testing to ISO 10993 (and often USP Class VI), production under ISO 13485, and frequently cleanroom molding. All medical-grade material is essentially food-safe, but not all food-grade material qualifies as medical grade.
A: Not always, but often. Low-risk, non-implant parts may be molded in a controlled but non-classified area. Patient-contact, sterile, and implant-grade components typically require classified cleanrooms such as ISO Class 7 to limit particulate and microbial contamination. The contact type and sterility requirement determine the environment.
A: USP Class VI is still referenced and useful, but it is increasingly treated as a screening test rather than a complete answer. The FDA emphasizes ISO 10993 as the current, risk-based biocompatibility framework. For most patient-contact devices you should plan to provide ISO 10993 data, using USP Class VI as supporting evidence.
A: Ask for current ISO 13485 certification, ISO 10993 biocompatibility evidence for the exact material, cleanroom class documentation, and sample CoC/CoA paperwork. Confirm material traceability and that the molding equipment supports cleanroom operation and accurate metering. Audit the quality system before committing to production.
