Liquid Silicone Co-molding
Since LSR and HCR have different properties, we apply these two materials in different applications. LSR overmolding can create high precise gasket for waterproof or air-proof. Meanwhile, LSR flashing requires a professional removal procedure to ensure the waterproof level of IP86, and the soft-touch of gaming keypads.
Solid Silicone Co-molding
HCR overmolding has the advantages of low cost and high production capability. We normally apply this technology to produce conductive silicone keypads. These over-molded parts also have characteristic of tactile feedback, chemical resistance, and long-lasting quality.
Silicone Co-molding Technology
Silicone Co-molding is the technology to mold silicone rubber onto thermoplastics, metals, or other substrates. These over-molded silicone can absorb shock, act sealing, and separate internal components. The most critical issue in silicone over-molding is protecting the insert or substrate. The mold should be designed carefully to keep the insert and substrate in place, in order to withstand injection pressure and avoid insert crushing in tight clearances.
Another important aspect of silicone over-molding is to achieve adhesion between silicone and plastic or metal substrate. This adhesion can be achieved in several ways: mechanical interlocking, primer, and self-adhesive silicone. Furthermore, we should keep inserts or substrates clean, pre-heat plastic and metal inserts. To avoid any chemical inhibition of silicone curing, and achieve a stronger adhesive bond.
Adhesion Bond Method
- Mechanical Interlocking: We can adjust the design structure of the insert or substrate, add undercut features to lock and hold silicone rubber in place.
- Primer: Primer is another option for excellent adhesion. Normally, we need 30 minutes to 2 hours to dry off primers. Then over-mold the inserts with silicone rubber for good bonding.
- Surface Treatment: Liquid silicone (LSR) can resist water, oxidation, and other chemical solutions like acids and alkali.
- Self-Adhesive LSR: Several LSR materials have self-adhesion characteristics, these LSRs can bond to plastics without primers and surface treatments. Liquid silicone rubber can bond well with Polycarbonate (PC), PolyEthylene Terephthalate (PET), PolyButylene Terephthalate (PBT), PolyPhenylene Sulfide (PPS), PolyEther Ether Ketone (PEEK), and Nylons (PA).
Silicone Over-molding Materials
HCR (high-consistency-rubber) and LSR (liquid silicone rubber) are two common silicone materials to overmold with the substrates by compression molding or injection molding. Because of the different vulcanizing agents in HCR and LSR. Normally, LSR has low molding temperature than HCR in the over-molding process.
| Silicone Materials | LSR (Platinum Vulcanization) | HCR (Platinum Vulcanization) | HCR (Peroxide Vulcanization) |
| Molding Temperature | 120℃-150℃ | 130℃-140℃ | 170℃-180℃ |
LSR Over-molding
Junle is the leading manufacturer of LSR over-molding in Vietnam. Our company has advanced production capability, outstanding quality control, and more than 20 years of exclusive experience in LSR overmolding. We are the ideal partner for your liquid silicone rubber parts project.
LSR over-molding is a cost-effective manufacturing technology for complicated assemblies with gaskets, seals, or fragile silicone rubber parts. This technique also provides LSR parts for applications with high tolerance and reliable performance. Regardless of parts performance enhancement, LSR over-molding also results in significant cost savings in assembly. The chemical and mechanical bond of LSR to thermoplastic in LSR over-molding is a popular solution, this process is also applied to create a durable bond of metals and LSR with integrated adhesive or mechanical bonding.
We provide value-added service in every stage of LSR over-molding, from design, prototyping, to packing and delivery. Our engineering team will assist you in finishing your silicone projects faster with less cost. Based in Vietnam, we can easily fulfill global orders from Asia, Europe, America, Oceania, and Africa.
HCR Over-molding
Junle is the leading manufacturer of HCR over-molding in Vietnam. Our company has advanced production capability, outstanding quality control, and more than 20 years of exclusive experience in HCR overmolding. We are the ideal partner for your liquid silicone rubber parts project.
HCR over-molding is a cost-effective manufacturing technology for complicated assemblies with gaskets, seals, or fragile silicone rubber parts. This technique also provides HCR parts for applications with high tolerance and reliable performance.
Silicone Over-Molding Benefits
Silicone co-molding is a cost-effective and versatile technology, that is applied in various industries and applications. Over-molding with liquid silicone injection enables us to produce aesthetic products with a wider range of colors and styles.
In addition, designing products with liquid silicone rubber (LSR) over-molding can improve product safety against electric shocks, protect sharp or delicate areas, and optimize the product’s shape for comfortable usage. For repetitive usage of medical instruments, LSR over-molded products are autoclavable. Liquid silicone rubber (LSR) formulations are ISO 10993 implantable grade and USP class 6 compliant for FDA requirements. From LSR over-molded handles to complex electronic assemblies, there are multiple benefits of LSR over molding.
- Saving Cost and Time: Complex manual assembly will be eliminated by molding silicone directly onto the metal or plastic substrate. This will reduce manufacturing costs and turnaround time dramatically, and encourage our LSR parts to a more economical level. It will also eliminate the risk and cost of secondary assembly.
- Design Flexibility: LSR overmolding is excellent for complex design requirements in the automotive and medical industries. Our LSR over-molding parts have properties of waterproof, airtight, shock, and vibration resistance.
- High Quality Control: Junle Molding has high tolerance and strict quality control in the LSR over-molding process, our LSR parts are suitable for any application with high precision. We can produce over-molded silicone parts with your specifications, including Class Ⅶ or Class Ⅷ cleaning room manufacturing.
- Extend Product’s Life Span: Silicone over-molding can add waterproofing, shock, and scratch resistance features on final over-molded products, in order to extend the life span of products or tools.
- Reduce Vibrations and Noise: Silicone as an elastomer has excellent elongation properties, it can absorb shocks efficiently, and reduce vibrations and noise in device assembly.
Custom Co-molding
Junle(Vietnam) has concentrated on silicone co-molding for 20 years, and we are the most experienced manufacturer of silicone over-molding technologies. Our expertise encourages us to tailor the entire process for your specific demands, and take your custom innovation to a new level.
We are the leading silicone parts manufacturer in Vietnam, and we are able to serve all enterprises and companies worldwide. Our advanced capability can encompass every aspect from design to production. We can assist you in selecting the perfect LSR grade, optimizing design manufacturability (DFM), provide premium-quality tooling, high-volume production, and packing solutions. Our high-quality LSR parts are widely applied in automotive, medical,