The Difference Between Platinum Cured Silicone Tube vs Peroxide Cured Silicone Tube
Two tubes can look identical, feel identical, and cost very differently — and the reason comes down to how they were cured. Understanding the difference between platinum cured silicone tube vs peroxide cured silicone tube is one of the most useful things an engineer or procurement manager can learn, because this single choice decides purity, compliance, surface quality and price. This article breaks down the curing chemistry in plain terms and shows exactly when each type is the right call.
Both start as the same base silicone. The difference is the catalyst system used to cross-link (cure) the polymer into a finished, set rubber — and that catalyst leaves a very different footprint in the final tube.
What “Curing” Means
Raw silicone is a soft, putty-like compound. Curing is the chemical reaction that cross-links the polymer chains into a stable, elastic solid. Two catalyst routes dominate the industry: a platinum-based addition cure and a peroxide-based free-radical cure. The route changes the by-products left behind, and that is the whole story.
Peroxide-Cured Silicone Tube
Peroxide curing is the older, more economical method. Organic peroxides trigger the cross-linking reaction under heat. It works reliably and produces perfectly good tubing for a huge range of uses.
The trade-off is by-products. Peroxide curing leaves small amounts of decomposition residues, which is why peroxide-cured tubing usually requires a post-cure bake to drive off volatiles and reduce odour. Even after post-curing, it is generally not specified for the most critical high-purity contact. It can also have a slightly less smooth inner surface than platinum-cured tube.
Best for: general industrial fluid transfer, insulation, sleeving, lower-criticality lines where cost matters more than ultra-high purity.
Platinum-Cured Silicone Tube
Platinum curing uses a platinum catalyst in an addition reaction that leaves virtually no by-products — there is nothing significant to bake off. The result is a cleaner, higher-purity tube with a smoother inner surface, low extractables and excellent biocompatibility.
That smooth bore matters in two ways: it reduces particle entrapment and resists the micro-shedding (spallation) that pump lines suffer. This is why platinum-cured tubing is the default for pharmaceutical, biotech, medical and high-purity food applications, and why it typically carries USP Class VI and FDA 21 CFR 177.2600 compliance. We cover compliance topics in more depth in our resources section.
Best for: pharma and biotech fluid paths, sterile dosing, peristaltic pumps, high-purity food and beverage contact.
Side-by-Side Comparison
| Property | Peroxide-Cured | Platinum-Cured |
| Cure by-products | Present; needs post-cure | Negligible |
| Purity / extractables | Good | Excellent / low |
| Inner surface | Slightly less smooth | Very smooth |
| Typical compliance | General grades | USP Class VI, FDA 21 CFR 177.2600 |
| Spallation resistance | Moderate | High |
| Relative cost | Lower | Higher |
| Best fit | Industrial / utility | Pharma, biotech, medical, food |
How to Choose Between Them
The decision is usually simple once you ask one question: does the fluid touch a patient, a drug, or a consumable?
- If yes — specify platinum-cured. The purity, low extractables and compliance documentation are non-negotiable for regulated work.
- If no — peroxide-cured controls cost without compromising performance on general industrial lines.
Do not over-specify. Putting platinum-cured tube on a workshop air line wastes budget; putting peroxide-cured tube on a sterile fill line risks an audit failure. Match the cure to the criticality.
A Practical Example
A nutraceutical manufacturer was using peroxide-cured tubing on a product-contact filling line to save cost. During an audit, the lack of low-extractable documentation and a faint residual odour became a problem. Switching that specific line to platinum-cured tubing — understanding the difference between platinum cured silicone tube vs peroxide cured silicone tube — resolved the audit finding and improved the inner-surface cleanliness. They kept peroxide-cured tube on their non-contact utility lines, so total cost stayed sensible. At Makvin Polymer we compound both in-house and advise customers which lines genuinely need which cure.
Frequently Asked Questions
What is the main difference between platinum and peroxide cured silicone tube? Platinum curing leaves negligible by-products and produces a cleaner, smoother, higher-purity tube, while peroxide curing is more economical but leaves residues that usually require a post-cure bake.
Which is better for pharma and food applications? Platinum-cured silicone is preferred for pharma, biotech, medical and high-purity food contact because of its low extractables, smooth bore and USP Class VI / FDA compliance.
Is peroxide-cured silicone tube safe to use? Yes, for general industrial and lower-criticality applications. It is reliable and cost-effective, but it is generally not specified for the most critical high-purity fluid contact.
Why does platinum-cured tubing cost more? The platinum catalyst and the higher purity, smoother surface and compliance it delivers raise the cost, which is justified for regulated and high-purity applications.
Does peroxide-cured silicone need a post-cure? Typically yes. A post-cure bake drives off volatile by-products and reduces odour, which is not required for platinum-cured tubing.
Conclusion
The difference between platinum cured silicone tube vs peroxide cured silicone tube comes down to purity versus cost. Platinum-cured wins on cleanliness and compliance for regulated lines; peroxide-cured wins on price for general industry. Specify by criticality, not by habit, and you optimise both performance and budget. For help choosing the right cure for each line, explore our technical resources section or contact our engineering team for a recommendation.
