Views: 0 Author: Lisa Wang Publish Time: 2026-05-06 Origin: Jinan Chensheng Medical Technology Co., Ltd.
We get this question all the time from customers trying to choose the right silicone for their medical devices. And honestly? The answer isn't always straightforward. Both curing methods produce silicone rubber with excellent properties, but they have meaningful differences that matter depending on your application.
Let us walk you through what you actually need to know.
Before we compare the two methods, let's make sure we understand the basics. Curing (also called vulcanization) is the process that transforms raw silicone polymer into a durable, elastic material. Without curing, silicone would just be a sticky mess.
The curing process creates cross-links between polymer chains, giving silicone its characteristic strength and resilience. How those cross-links form—whether through platinum catalysis or peroxide decomposition—determines many of the final material's properties.
Platinum-catalyzed cure systems use a platinum compound as the catalyst to initiate the cross-linking reaction. The platinum acts like a matchmaker, helping the vinyl and hydrogen groups in the silicone polymer find each other and bond.
Ultra-clean formulation: Platinum-cured silicone produces virtually no by-products during curing. This means minimal extractables and leachables—critical for medical and pharmaceutical applications.
Superior clarity: If you need transparent or translucent tubing, platinum-cured silicone is your best bet. It maintains clarity throughout the curing process and during use.
Consistent physical properties: The platinum catalyst system produces very uniform cross-linking, leading to consistent mechanical properties batch after batch.
No peroxide by-products: Peroxide cure systems can leave residual chemicals in the finished product. Platinum systems eliminate this concern.
Better compression set resistance: Platinum-cured silicone generally maintains its shape and sealing properties longer under repeated compression.
Higher cost: Platinum is an expensive catalyst, and the process requires more precise manufacturing controls. This makes platinum-cured silicone more expensive.
Shorter shelf life of uncured material: The platinum catalyst starts working immediately, so uncured compound has limited shelf life once catalysts are added.
Sensitive to poisoning: Certain contaminants (like sulfur, nitrogen, and phosphorus compounds) can deactivate the platinum catalyst, causing cure problems.
Peroxide cure systems use organic peroxide compounds (commonly dicumyl peroxide or similar) that decompose when heated, releasing free radicals that initiate cross-linking between polymer chains.
Cost-effective: Peroxide-cured silicone is generally less expensive to produce, making it popular for high-volume applications where cost is critical.
Forgiving processing: The cure system is less sensitive to minor contamination and temperature variations during processing.
Better release characteristics: Peroxide-cured compounds often release from molds more easily, which can improve manufacturing efficiency.
Excellent for thick sections: Peroxide cure systems penetrate and cure through thick cross-sections more reliably than platinum systems.
Longer shelf life of uncured compound: Peroxide-cured compounds remain workable longer once catalyzed.
Extractables concern: The peroxide decomposition creates by-products (like acetone) that can remain in the finished material. For sensitive medical or pharmaceutical applications, these extractables can be problematic.
Color and clarity: Peroxide cure systems often cause slight yellowing, making them unsuitable for applications requiring optical clarity.
More variable properties: Peroxide cure can produce less uniform cross-linking, leading to more batch-to-batch variation.
Odor: Some peroxide-cured products have noticeable odor from residual by-products.
Here's our practical guide for making the decision:
You're making products for medical or pharmaceutical applications
You need USP Class VI or similar biocompatibility certifications
Optical clarity is important (transparent tubing, viewing windows)
You're producing implants or devices with prolonged tissue contact
Your application involves sensitive fluids where extractables must be minimized
You're making products for regulatory markets (FDA, CE, NMPA) that require extensive biocompatibility documentation
Cost is the primary driver and the application isn't critically sensitive
You're making industrial-grade products (not medical or food contact)
The product will be used in thick cross-sections
You need excellent mold release properties
The application doesn't involve sensitive fluids or prolonged body contact
Medical Devices: For almost any medical device application, we recommend platinum-cured silicone. The biocompatibility advantages and regulatory acceptance make it the clear choice. USP Class VI certification is much more straightforward with platinum-cured materials.
Pharmaceutical Processing: Platinum-cured silicone is virtually mandatory for applications involving drug manufacturing or sensitive biologics. The minimal extractables protect product purity.
Food and Beverage: Both cure systems can meet food-grade requirements, but platinum-cured silicone offers cleaner certification for sensitive applications.
Industrial Applications: Peroxide-cured silicone often provides the best value proposition for non-critical industrial uses.
For all our medical-grade silicone products, we exclusively use platinum-cured formulations. This ensures our customers receive components that meet the most stringent biocompatibility requirements and regulatory standards worldwide.
Our platinum-cured medical silicone undergoes rigorous testing to verify:
Minimal extractables across multiple solvent systems
USP Class VI compliance
Consistent physical properties
Long-term stability in storage and use
Both platinum-cured and peroxide-cured silicone have their place in the market. The key is matching the cure system to your application requirements. For medical and pharmaceutical applications where patient safety and product purity are paramount, platinum-cured silicone's advantages almost always justify the higher cost.
If you're unsure which cure system is right for your application, reach out to us. We're happy to help you evaluate your requirements and recommend the most appropriate solution.
With both platinum-cured and peroxide-cured silicone options available, selecting the right material can be challenging. Our expert team at Chensheng Medical is here to help you navigate your choices.
Contact Us to discuss your specific application requirements and get tailored recommendations for the best silicone solution.
You can also explore more insights on our Blog.
Author: Dr. Lisa Wang, R&D Director at Chensheng Medical
Dr. Wang leads our silicone formulation development team and has over 12 years of experience developing medical-grade elastomers for critical healthcare applications.
