Liquid Silicone Rubber Injection Molding

Manufacture custom silicone prototypes and end-use production parts in 15 days or less in a range of durometers and grades of LSR materials. Subject to availability. HYmoldplastic doesn’t guarantee that we can provide this service at any given time.

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STEP | STP | SLDPRT | IPT | PRT | SAT files

Liquid Silicone Rubber Molding Capabilities

Our basic guidelines for silicone rubber molding encompass essential design considerations aimed at improving part moldability, enhancing cosmetic appearance, and reducing overall production time.

	US	Metric
SIZE	12 in. x 8 in. 4 in.	304.88mm x 203.2mm x 101.6mm
VOLUME	13.3 cu. in.	217,948 cu. mm
DEPTH	No greater than 2 in. from any parting line; deeper parts are limited to a smaller outline	No greater than 50.88mm from any parting line; deeper parts are limited to a smaller outline
PROJECTED MOLD AREA	48 sq. in.	30968 sq. mm

Tolerances: HYmoldplastic can maintain a machining tolerance of +/- 0.003 in. (0.08mm) with a linear tolerance of +/- 0.025 in./in. (0.025mm/mm).

Liquid Silicone Rubber Materials

Standard Silicone (30, 40, 50, 60, and 70 durometers)
Medical-Grade Silicone
Optical-Grade Silicone
Fluorosilicone (fuel and oil resistant)

Surface Finish Options

SPI Finishes

Range of finishes from Grade 3 diamond / high polish to 320 stone low polish. Finishes include: SPI A-1 SPI A-2 SPI A-3 SPI B-1 SPI B-2 SPI B-3 SPI C-1 SPI C-2 SPI C-3 SPI D-1 SPI D-2 SPI D-3

As Molded

No secondary polishing or grinding. Part will show tooling marks.

Other Mold Texturing

HYmoldplastic can match other mold textures upon request.

Laser Engraving

Engraving text or a design with a laser.

Pad Printing

Applying an ink-based, 2D design to a 3D surface.

Painting

Applying primer, top coat, EMI (copper) paint, in both standard and Pantone colors.

How Does Liquid Silicone Rubber Molding Work?

First, a liquid silicone rubber (LSR) molding tool is created using CNC machining. This tool must be designed to withstand high temperatures for the LSR injection molding process and may be polished to offer various finish options.

Next, the finished tool is loaded into an LSR-specific injection molding press, precisely geared for accurate control of shot size, ensuring the production of consistent LSR parts. The materials used include standard silicones and specific grades tailored for different applications. Since LSR is a thermosetting polymer, its molded state is permanent and cannot be remelted like thermoplastics. Once the LSR injection molded parts are ready, they are removed from the mold and utilized as prototypes or production components.

Injection molded silicone rubber is an excellent solution for various industries, including medical, lighting, and automotive.

Specialist industries

We’ve manufactured millions of parts for a wide range of applications, with specialized expertise in such as automotive, medical devices, electronics, consumer products, etc.]. Our deep knowledge in these sectors allows us to deliver high-quality, tailored solutions for every project.