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Silicone knowledge - What are the advantages of addition-cure silicone rubber in precision instrument casting?
2025-03-31
Addition-cure silicone rubber exhibits many unique advantages in the precision instrument casting industry, making it an indispensable material in this field. The following is a detailed explanation of these advantages:
I. Low Shrinkage and High Precision
Addition-cure silicone rubber releases almost no low-molecular-weight substances during crosslinking, resulting in minimal volume change. The shrinkage rate is typically less than 0.1%. This characteristic ensures that the mold maintains extremely high dimensional stability and precision during curing, meeting the high dimensional requirements of precision instruments for castings.
II. High Transparency and Visibility
Compared to condensation-cure silicone rubber, addition-cure silicone rubber can achieve semi-transparency or even high transparency. This characteristic allows for clear observation of the state of the casting material within the mold during precision instrument casting, such as the presence of bubbles or impurities, ensuring the quality of the casting.
III. High Temperature Resistance and Stability
Addition-cure silicone rubber has excellent high-temperature resistance, with a wide operating temperature range, typically usable from -65°C to 250°C while maintaining softness and elasticity. This high-temperature resistance makes addition-cure silicone rubber perform exceptionally well when casting high-temperature molten materials, while also resisting deformation and cracking caused by thermal stress.
IV. Environmentally Friendly, Non-toxic, and Food-Grade Certified
Addition-cure silicone rubber uses a platinum catalyst for curing, so its products are non-toxic and odorless, meeting environmental requirements. Some products have also passed FDA food-grade certification, indicating that they can be safely used in contact with food. This characteristic allows addition-cure silicone rubber to be widely used in fields with high precision requirements, such as medical and food packaging.
V. High Tensile and Tear Strength
Addition-cure silicone rubber has high tensile strength and tear resistance, capable of withstanding significant mechanical stress without easily breaking. This characteristic allows the mold to maintain good integrity during repeated use and demolding, extending the mold's lifespan and reducing production costs.
VI. Easy Operation and Flexibility
Addition-cure silicone rubber has good fluidity, making it easy to pour and mold. It can also be cured at room temperature or with heating, making it convenient and flexible to operate. This flexibility allows addition-cure silicone rubber to adapt to different processes and environmental needs, improving production efficiency.
In summary, addition-cure silicone rubber stands out in precision instrument casting due to its unique advantages: low shrinkage, high transparency, high-temperature resistance, environmentally friendly and non-toxic nature, high tensile and tear strength, ease of operation and flexibility, and wide applicability. These advantages not only improve the manufacturing precision and quality of precision instruments but also reduce production costs and promote technological innovation and development in related fields.
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