Compression Overmolding

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Compression Overmolding Silicone Products Manufacturer

Compression overmolding is a manufacturing process that involves the use of heat and pressure to mold silicone rubber material around a substrate, such as, metal or plastic. This technique is particularly useful when it comes to producing complex parts with varying shapes and sizes. The process involves placing a pre-formed substrate, such as a metal or plastic component, into a mold cavity, and then overmolding the silicone rubber material around it. The mold is closed and heat and pressure are applied, causing the material to flow around the substrate and bond to it. This process results in a strong, durable bond between the substrate and the overmolded material, providing protection against environmental factors such as moisture, dust, and vibration. 

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Compression Overmolding Products

Compression Overmolding Process

The compression overmolding process involves the creation of a mold that is designed to the exact specifications of the product being produced. The mold is then filled with material and compressed under high pressure and heat, resulting in a product that perfectly matches the mold's shape.


The first step in compression overmolding is the creation of the mold. This is a crucial step that requires precision and attention to detail. The mold must be designed to exact specifications, taking into account factors such as size, shape, and material composition.


Once the mold is created, the material is placed inside and compressed under high pressure and heat. This causes the material to flow into the mold and take on the shape of the product being produced. The pressure and heat also help to cure the silicone material, resulting in a strong and durable finished product.

Compression Overmolding Applications

Compression overmolding is a versatile manufacturing process that has a wide range of applications across multiple industries. Its ability to produce strong, durable, and lightweight parts makes it an ideal choice for use in electronics, medical, beauty and consumer goods applications.

Electronic Components

Compression overmolding is used to produce a range of parts, including waterproof connectors, switches, and sensors. The finished products are not only strong and durable but also resistant to heat, dust-proof and waterproof, making them ideal for use in harsh environments.

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Medical and Beauty Products

Compression overmolding is also used in the production of beauty and medical devices. This process is used to produce a range of parts, including silicone powder puff. Since the silicone material is bio-compatible, the finished products are also used in medical devices.

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Consumer Goods

Compression overmolding is also used in the production of consumer goods. This process is used to produce a range of products, including baby feeding spoon, sporting goods, and household appliances. The finished products are not only strong and durable but also aesthetically pleasing, making them ideal for use in a wide range of applications.

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Advantages and Disadvantages of Compression Overmolding

This process has several advantages and disadvantages that should be considered before deciding whether to use it.


One of the advantages of compression overmolding is its ability to produce complex shapes with tight tolerances. This is because the material is compressed under high pressure, which allows it to flow into every crevice and corner of the mold. This results in a product that is free from defects and has a smooth surface finish.


Another advantage of compression overmolding is its ability to produce products with a variety of properties. This is because different materials can be used in the process, including thermoplastics and thermosets. Thermoplastics are known for their flexibility and durability, while thermosets are known for their strength and resistance to heat and chemicals.


However, there are also some disadvantages to compression overmolding that should be considered. One of the main drawbacks is that it can be a relatively expensive process, particularly for small production runs. This is because the tooling required for compression overmolding can be complex and expensive to produce, which can drive up the overall cost of the process.


Another disadvantage of compression overmolding is that it can be difficult to modify or repair parts that have been produced using this process. This is because the thermoset material used in compression overmolding cannot be melted or reshaped once it has been cured, which can make it difficult to make changes or repairs to the part after it has been produced.

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Compression Overmolding Products Manufacturer

Compression overmolding is a cost-effective solution for producing complex parts with multiple components, as it eliminates the need for assembly and reduces the risk of component failure. It is also a versatile process that can be used with a variety of materials and substrates. Overall, compression overmolding is an efficient and reliable manufacturing process that offers numerous benefits for a wide range of industries. 


YEJIA has been a trusted manufacturer of custom silicone products for over several decades. Our team of professional engineers is dedicated to providing high-quality silicone products to our clients. We have in-house mold design and mold making engineers who work tirelessly to ensure that our products meet the highest standards. Our factory has been certified by ISO9001, ISO14001, ISO13485& IATF16949, which is a testament to our commitment to quality. With over 10,000 square meters of silicone molding workshop, we have extensive experience in silicone overmolding with other materials. If you're looking for compression overmolding suppliers, look no further than YEJIA. Contact us today to learn more about our products and services.



Q: What is the difference between compression molding and compression overmolding?

A: Compression molding involves molding a material into a specific shape without the use of an insert. Compression overmolding, on the other hand, involves molding a material around an insert.

Q: What are the design considerations for compression overmolding?

A: Design considerations for compression overmolding include selecting the right material, determining the appropriate insert size and shape, and ensuring proper gating and venting.

Q: What are the limitations of compression overmolding?

A: The limitations of compression overmolding include limited part size and complexity, longer cycle times compared to other molding processes, and higher labor costs.