Liquid Silicone Rubber (LSR) Molding Services

BoValley supports liquid silicone rubber (LSR) molding projects for selected flexible, resilient, and precision-molded components. LSR can be suitable for parts requiring elastic recovery, sealing performance, and resistance to demanding environmental conditions, depending on the selected silicone grade and application.

Request a Quote Discuss Your LSR Project

Project Review

Sealing Geometry Review
Compound Requirements
Flash Criteria
Inspection Planning

Part Geometry: Flexible seals & profiles
Tooling Schedule: Confirmed with the quote
Material Type: Liquid silicone rubber

Overview

What is Liquid Silicone Rubber Molding?

Liquid Silicone Rubber (LSR) molding uses a two-component liquid silicone system that is metered, mixed, and injected into a heated mold, where it cures into an elastomeric part. The process is used for selected components requiring flexibility, resilience, sealing, and stable performance across defined service conditions.

LSR is different from conventional thermoplastic injection molding. Silicone components are formed through a curing reaction rather than by cooling a molten thermoplastic. Mold design, material handling, curing conditions, and part removal all influence the final result.

Material grade and compliance requirements should be selected according to the actual application. Food-contact, medical, electrical, or other regulated uses require the appropriate material documentation and validation.

Manufacturing workflow from CAD review through production and inspection

Liquid Silicone Rubber Molding Design Review

Specify hardness, sealing geometry, and service temperature so the silicone grade and tooling can be evaluated together.

Request a Design Review

Liquid Silicone Rubber Molding Capabilities

Assess thin sections, sealing lips, intricate profiles, and other design features against tooling and process requirements.

Flexible Sealing Components

Define sealing surfaces, compression and the mating geometry. Evaluate the seal at the actual temperature and pressure of use.

Materials

Liquid Silicone Rubber Molding Materials

LSR grades are selected according to hardness, flexibility, temperature exposure, sealing requirements, color, and application-specific compliance. The following are material categories to discuss with the supplier.

General-Purpose LSR
Soft LSR Grades

Heat-Resistant LSR
Colored LSR

Sealing-Grade LSR
Specialty LSR Grades
Shore A hardness
Compression behavior

Tear resistance
Color and translucency
Operating temperature

Compression set
Elastic recovery
Sealing pressure

Flash criteria
Cure conditions

Deflashing method
Part wall thickness
Mold shutoff

Parting line position
Surface texture
Chemical exposure

Dimensional checks
Hardness test method

Discuss Silicone Grades

LSR Molding Design Parameters

Review grade, hardness, sealing geometry and flash limits against the requirements of the finished component.

LSR Molding Design Parameters
Parameter	Typical Options / Considerations
Material Characteristics	Elastomer, typically flexible
Material Type	Two-component liquid silicone system
Hardness	Selected Shore A grades, subject to material availability
Part Geometry	Seals, gaskets, membranes, flexible buttons, and selected thin-wall parts
Color	Natural translucent and selected colored grades, subject to availability
Curing	Heated mold and controlled curing cycle
Post-Processing	Deflashing, cleaning, and other agreed finishing or inspection
Quality Checks	Dimensions, flash, surface condition, and application-specific functional tests
Production Volume	Prototype or production tooling, subject to process and project feasibility

The Process

How Is Liquid Silicone Rubber Molded and Checked?

The liquid silicone components are metered and mixed, then injected into a heated mold to cure. After demolding, check the agreed dimensions, flash and appearance. Verify hardness or seal performance when required by the application.

The advantages

Elasticity and Recovery:• Suitable for selected parts that need to deform and recover their shape.
Complex Sealing Features:• Supports detailed molded profiles for selected sealing and interface designs.
Temperature Performance:• Suitable grades can perform across defined temperature ranges; confirm the selected compound's limits.

The challenges

Flash control:• Low-viscosity silicone can pass through small gaps, especially around shutoffs and parting lines.
Demolding:• Deep undercuts, thin lips and fragile features can stretch or tear during release.

Quality

Applications for Liquid Silicone Rubber Molding

LSR is commonly considered for parts that need elasticity, repeatable shape recovery, and application-specific environmental performance.

Seals & Gaskets

Sealing interfaces and custom gasket components.

Flexible Boots & Covers

Protective covers and flexible molded shapes.

Buttons & Keypads

Flexible interfaces and tactile components.

Membranes & Diaphragms

Application-specific flexible parts.

Packaging

Especially beverage, food, cosmetic, and pharmaceutical packaging.

Appliances

Housings and components for smaller appliances.

Liquid Silicone Rubber Molding applications
Types of Parts	Function
Sealing gaskets	Create a flexible contact interface between mating components.
Protective boots	Cover moving or exposed features while allowing deflection.
Keypads and diaphragms	Provide repeatable movement or tactile response in a molded part.

Ready to Start Your Next Manufacturing Project?

Share your CAD files and project requirements. An engineer will review the details and follow up with pricing and any manufacturability questions.

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