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The Difference Between Tin-Cured and Platinum-Cured Silicone
8 Differences Between Tin-Cured and Platinum-Cured Silicone
Silicone rubber is a highly versatile elastomeric material used to fabricate molds, special effects, prototyping applications, and various other products. It is known for its pliability, flexibility, durability, and resistance to extreme temperatures. Silicone rubber is categorized into two series: condensation-cure (tin catalyst) silicone and addition-cure (platinum catalyst) silicone. Although both have similar characteristics, the curing processes for each and their final properties differ. Ultimately making them suitable for different applications. Let's compare the two types of silicone rubber and discuss their properties and applications to help you choose the right type for your needs.
1) Cost
Cost is a key consideration when selecting the appropriate material. Tin-cured silicone is generally more affordable than platinum-cured silicone, which makes it a better choice for projects with a lower budget. Platinum-cured silicone is generally more expensive than tin-cured silicone, however it does offer several notable advantages that may make it worth the extra cost.
2) Shelf Life
Tin-cured silicone has a shorter shelf life compared to platinum-cured silicone. Typically lasting around 10 to 12 months. Platinum cured silicone usually has a shelf life of around 24 months.
3) Curing Principle
The curing mechanism is the number one difference between tin-cured silicone and platinum-cured silicone. In condensation-cure silicone, also known as tin-catalyzed silicone, the cross-linking agent undergoes hydrolysis reaction with moisture in the air. It cross-links with polydimethylsiloxane under the action of a tin-based catalyst. During the curing process, acetic acid is released as a byproduct.
On the other hand, platinum-cured silicone, also known as addition-cured silicone, undergoes cross-linking with a curing agent and vinyl silicone oil under the influence of a platinum catalyst. No byproducts are generated during the curing process. This results in the final product exhibiting minimal shrinkage and ensuring higher dimensional accuracy.
4) Application of Silicones
No single material is suitable for every process. The properties of tin-cured and platinum-cured silicone make them suitable for different applications. Tin-cured silicone is commonly used for making molds for casting materials, such as resins, concrete, sculptures, plaster, wax, and low-melting point metals. High-hardness tin-cured silicone is also used for rapid prototyping. On top of all that, tin-cured silicone is suitable for applications that need high tear strength and flexibility.
Platinum-cured silicone is commonly used for manufacturing food-grade molds, soap, candles, and other products where it does not release any byproducts that may contaminate the final product. It is also used in the production of realistic dolls and special effects because it is more stable over time and has higher heat resistance. On top of all that, platinum-cured silicone is suitable for applications that require a smooth surface finish and minimal shrinkage.
5) Compatibility with Other Substances
Tin-cured silicone is generally compatible with a wide range of materials and remains unaffected by them during the curing process. In contrast, platinum-cured silicone should not be combined with tin-cured silicone, as it is sensitive to contaminants like sulfur, latex, and certain clays. These substances can interfere with the curing of platinum-cured silicone. Due to its biocompatibility, durability, and compliance with strict regulatory standards, platinum-cured silicone is often used in medical devices, food-grade products, and other high-performance applications.
6) Mixing Ratio
Tin-cured silicone and platinum-cured silicone are both silicone rubber compounds. However, their ratios of Part A to Part B are different. The ratio of condensation-cured silicone is 100:2-100:4, while the ratio of addition-curing silicone is 1A:1B and the ratio of addition-curing silicone is 10A:1B. All of this is on the packaging for the particular silicones, so be sure to follow instructions carefully.
7) Overall Performance
The difference in curing mechanisms can affect the final properties of silicone. Tin-cured silicone has higher tear strength compared to platinum-cured silicone. However, the stability of tin-cured silicone decreases over time as byproducts released during curing can lead to silicone degradation. On top of that, tin-cured silicone is more prone to shrinkage and aging with time.
On the other hand, platinum-cured silicone has lower tear strength than tin-cured silicone. However, it is more stable over time. This is due to the fact that the curing process does not release any byproducts that may impact the performance of the silicone. Additionally, platinum-cured silicone exhibits higher heat resistance, which makes it suitable for applications that require exposure to high temperatures.
8) Exterior Color
The default color of tin-cured silicone is white or translucent. The Part A base is white or translucent, and the Part B tin catalyst is clear to light yellow in color. If other colors need to be customized, the addition of other pigments for coloring in Part B is possible through manufacturing process.
The default color of platinum-cured silicone is translucent or transparent. Both Part A and Part B are translucent in the case of translucent platinum-cured silicone. If other colors are required, then other pigments can be added during manufacturing to Part B for coloring. In the case of transparent platinum-cured silicone, the Part A base is transparent, while the Part B platinum-curing agent is colorless.
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