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Silicone Rubber FAQs

Explore clear answers about silicone rubber properties, hardness, mechanical performance, curing systems, processing methods, applications, and material selection.
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Silicone Rubber Properties & Performance

1. What does Shore A hardness mean for silicone rubber?

Shore A hardness measures the resistance of cured silicone rubber to indentation. It is commonly used to specify the hardness of silicone rubber products and ranges from soft, flexible grades to harder elastomers.

2. How is silicone rubber tensile strength measured?

Tensile strength is the maximum stress silicone rubber can withstand before breaking under tension. It is commonly reported in MPa and is an important indicator for seals, gaskets, hoses, and other mechanically loaded parts.

3. What is elongation at break in silicone rubber?

Elongation at break indicates how much silicone rubber can stretch before failure, expressed as a percentage. Higher elongation generally indicates greater extensibility and flexibility.

4. What is tear strength in silicone rubber?

Tear strength measures the resistance of cured silicone rubber to the growth of a tear. It is especially important for thin parts, seals, diaphragms, profiles, and components exposed to mechanical stress.

5. What is compression set in silicone rubber?

Compression set measures the permanent deformation remaining after silicone rubber has been compressed for a specified time and temperature. Low compression set is important for long-term sealing performance.

6. How does silicone rubber hardness affect performance?

Hardness affects flexibility, compression behavior, sealing force, tactile properties, and resistance to deformation. The appropriate Shore A grade should be selected according to the application and mechanical requirements.

Silicone Rubber Curing & Vulcanization

7. What is silicone rubber vulcanization?

Silicone rubber vulcanization is the crosslinking process that converts uncured silicone material into an elastic, stable elastomer. The process can use peroxide or addition-curing systems depending on the material and application.

8. What is the difference between peroxide and platinum curing?

Peroxide curing uses organic peroxide initiators to crosslink silicone rubber, while platinum-catalyzed addition curing uses a hydrosilane crosslinker and platinum catalyst. Platinum systems are widely used where clean curing and controlled processing are required.

9. What is post-curing of silicone rubber?

Post-curing is an additional heat-treatment step after primary curing. It can help remove residual volatile substances and further stabilize selected silicone rubber compounds for demanding applications.

10. Does silicone rubber shrink during curing?

Silicone rubber generally has relatively low curing shrinkage, but dimensional change depends on the compound, curing system, mold design, and processing conditions. Low shrinkage is one reason silicone rubber is suitable for precision molding.

11. How long does silicone rubber take to cure?

Cure time depends on the silicone formulation, curing system, temperature, part thickness, and processing method. Injection-molded LSR can achieve short production cycles, while RTV materials may require considerably longer curing times.

Silicone Rubber Processing & Molding

12. What is silicone rubber injection molding?

Silicone rubber injection molding is a manufacturing process in which silicone material is injected into a mold and cured to form the final part. LSR is particularly suited to automated injection molding and high-volume production.

13. What is silicone rubber extrusion?

Silicone rubber extrusion continuously forces uncured silicone through a shaped die to produce profiles, tubing, seals, gaskets, and other continuous products. HCR is widely used for silicone rubber extrusion.

14. Can silicone rubber be compression molded?

Yes. Silicone rubber can be compression molded by placing a measured compound into a mold and applying heat and pressure to form and cure the part. This method is commonly used for seals, gaskets, and molded components.

15. What is silicone rubber overmolding?

Silicone rubber overmolding is a process in which silicone is molded directly onto another component or substrate. It is commonly used to create integrated seals, grips, soft-touch surfaces, and protective components.

16. What is the difference between LSR injection molding and HCR molding?

LSR is a low-viscosity two-component material typically processed by automated injection molding, while HCR is a high-consistency solid silicone commonly processed by extrusion, compression molding, transfer molding, or injection molding.

Silicone Rubber Applications & Material Selection

17. Why is silicone rubber used for seals and gaskets?

Silicone rubber combines flexibility, temperature stability, weather resistance, and good compression performance, making it suitable for seals and gaskets used across automotive, electrical, industrial, and consumer applications.

18. Is silicone rubber suitable for high-temperature applications?

Yes. Silicone rubber maintains useful elasticity and performance across a broad temperature range, making it suitable for demanding automotive, electrical, industrial, and high-temperature sealing applications. Specific temperature limits depend on the formulation and service conditions.

19. Is silicone rubber suitable for electrical insulation?

Yes. Silicone rubber provides strong electrical insulation and can maintain performance under demanding temperature and environmental conditions. It is widely used for cable insulation, connectors, insulators, and electrical protection components.

20. Can silicone rubber be used for automotive components?

Yes. Silicone rubber is widely used for automotive seals, gaskets, hoses, connectors, dampers, cable components, and other parts requiring temperature resistance, flexibility, and long-term durability.

21. How do I select the right silicone rubber grade?

Select the grade based on hardness, tensile and tear strength, elongation, compression set, temperature range, chemical exposure, curing method, processing technology, and required certifications. The final selection should match both the application environment and manufacturing process.

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