SIMTEC Capabilities

In recent years, custom silicone injection molding has grown in popularity because of LSR’s competitiveness with other materials, improved manufacturing processes, and the ability to produce simple or complex parts with relatively short cycle times. The primary properties of LSR — such  as high-tensile strength, a low compression set, high elongation, and high thermal stability — make the material ideal for extreme weather applications or solutions that require exceptional durability, especially construction, automotive, and  other traditional industries.

The FDA approval of odorless, tasteless, and hypoallergenic grades of silicone for medical devices and food contact applications expanded the use of LSR as a material alternative. SIMTEC Silicone Parts employs a stable production process that takes advantage of the qualities that make up LSR manufacturing, including:

  1. Quality
  2. Speed
  3. Scalability from single prototypes to high-volume production runs

The ability to fabricate high-quality components continuously makes LSR manufacturing extremely cost-effective. Compared to other manufacturing methods, custom molded products and parts are flash-free and have minimal gate indication.

SIMTEC’s Technical Expertise

In an era of cost-cutting and limited resources, many companies have budgetary limitations for new product design and development. In addition, some entities have in-house plastic molding and tooling experience, but they don’t have the resources and expertise needed to complete a successful LSR molding project. This is where the LSR molding services offered by SIMTEC can help set you apart from your competitors. In more than a decade, SIMTEC Silicone Parts has become one of the world’s leading silicone injection molding companies.

Unlike some companies that offer injection molding services, SIMTEC focuses exclusively on LSR molding services. Our capabilities include:

Liquid Silicone Injection Molding

Liquid Injection Molding or LIM refers to the process that molds materials into different parts and products.  More businesses have come to recognize its value as a suitable alternative to gum-based compression molding.

The LIM process allows manufacturers to efficiently and effectively produce an array of products, such as seals, O-rings, gaskets, isolators, and electronic contacts. Not only can manufacturers produce durable parts in high volume, but they can also produce parts that require high-purity, platinum-cured silicone with a low compression set, excellent stability, and resistance to extreme temperatures. Additional benefits of liquid silicone injection molding include:

  • Reduces waste
  • Leverages the material characteristics
  • Cures in as little as 30 seconds
  • Minimizes out-gassing of plasticizers


Manufacturers across a variety of industries use overmolding for a diverse number of applications. This two-stage process consists of a finished metal or plastic component placed into an LSR mold, and then molding the LSR component directly to the part. Overmolding is the only way to incorporate materials (aside from other thermoplastics and LSRs) into the injection molding process. The high tolerances and strict quality control standards required for the overmolding process make it an ideal technique for parts and products that require precision.

LSR 2-Shot Injection Molding

Sometimes referred to as multi-component injection molding, in-mold, twin shot, or assembly injection molding, this technique describes the process of overmolding liquid silicone rubber directly onto a thermoplastic substrate — immediately after molding the thermoplastic substrate, within the same  mold, and employing the same  machinery.

LSR 2-Shot technology allows manufacturers to incorporate multiple functions, materials, and components into a single permanently fused part. LSR 2-Shot Injection Molding appeals to businesses that are seeking the following advantages:

  • The ability to take advantage of the best qualities of each material
  • Reduction or elimination of the need for post -molding assembly
  • Lower initial investment because it requires one tool to produce the component
  • Reduced inspection and quality control processes for both tool and product

The twin shot process works well for parts with complicated geometry, thickness consistency requirements, and tight tolerances.  Manufacturers that need to execute complex designs, part weight optimization, or integrate multiple materials or multiple functions into one component will find this technique appealing.

Contact a SIMTEC representative by phone or email to discuss the right capability for your silicone injection molding project, and to obtain a free quote.