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When we talk about platinum or peroxide curing in the silicone world, curing is when the silicone rubber is chemically cross-linked by means of the addition of a peroxide or platinum curing agent. The curing agents differ chemically to give the end product, in this case silicone, different properties. Here we look at the positives and negatives of each system to make it clearer when deciding on what silicone material you require for your application.
Peroxide Cured Silicone
Positives
Easier to process – needs less temperature to cure the silicone
Once mixed, a peroxide cured silicone compound has a vastly superior shelf life so can be stored and used for longer
Generally cheaper to buy the raw ingredients so more competitive prices
Tried and tested systems and the industry standard
Negatives
Sheets and tubing not as clear as platinum cured silicone. Peroxide is more translucent in appearance rather than transparent
Needs talc or an introduction of a liner to prevent the silicone sticking to itself especially when manufacturing silicone sheeting
Platinum Cured Silicone
Positives
Sheets and tubes are clearer so more visibility through the material
Can be run talc free
Generally physical properties are better especially tensile strength and tear strength
Viewed as being the cleaner silicone out of the two which is why it is favoured in the Food, Beverage and Medical sectors
Negatives
More expensive than peroxide which can be prohibitive if cost is an issue
Harder to process – needs relatively high temperatures to cure
Short shelf life – once mixed the compound has a very short shelf life and so this usually leads to waste such as head set ups being scrapped etc
At Silicone Engineering we offer both peroxide and platinum grades of silicone. The majority of silicone we make is peroxide cured silicone however for applications within the Food, Beverage and Medical sectors, we also offer platinum grades which are favoured in these sectors.
Overall, both curing systems produce quality silicone materials if manufactured to high standards and specifications. Both have positives and negatives and which one you choose should be in relation to the application and where the silicone will end up.