LSR Overmold Technology | Liquid Silicone Rubber Injection Molding

LSR Overmold Technology | Liquid Silicone Rubber Injection Molding

Silicone overmolding is a process where liquid silicone rubber (LSR) is molded directly over a substrate, such as plastic or metal. Instead of producing the silicone part separately and then bonding it later, the substrate is placed into the mold, and LSR is injected around it. Once cured, the silicone becomes an integrated outer layer of the part.

This method creates strong adhesion between materials, forming a seamless structure that improves functionality, comfort, and aesthetics. In many baby products and kitchen tools, LSR overmolding is essential because the components must be soft, food-grade, and resistant to high temperatures.

• Cleaner appearance and better parting lines

Overmolding molds the silicone directly on the substrate, allowing the mold to close tightly before injection. This results in finer parting lines and a smoother, more premium appearance.

• Strong structural bonding

The silicone chemically bonds to plastic or metal during curing, enhancing durability and preventing detachment even after long-term use or repeated cleaning.

 For example, silicone plates and silicone spoons , both raw materials need to use food-grade liquid silicone raw materials, and need to be produced in A dust-free workshop.

Silicone plate it is simple, usually use common runner mold for production, demolding by manual, and the hardness of raw materials is generally selected above 50 shore A.

Silicone spoons generally use the LSR overmolding process. Plastic or metal parts are placed on the corresponding position of silicone mold , then inject liquid silicone raw material to mold to molding the finish spoon, usually using glue to bond with the silicone part, and these plastic and metal parts also need to reach food grade and high temperature resistance.

TYM can provide first-class various of LSR injection molding machines, precision silicone and plastic molds and other LSR equipment to meet your production needs of silicone baby tableware.

 150T Horizontal LSR injection molding machine TYM-W5555 Specifications

 LSR Mold for food plate