High-quality LSR Injection Molded Parts
LSR injection molding meters and mixes a two-component liquid silicone compound, then injects it into a heated mold to form a cross-linked elastomer. The mixing ratio, cure cycle and any post-curing follow the selected grade's processing instructions. Unlike a thermoplastic, cured LSR is not remelted; temperature capability and dimensional behavior still need grade-specific review and part validation.
FECISION reviews the applicable production-site quality system and project documentation with the manufacturing partner. Medical programs specify the component use, material records, traceability and validation requirements before the order is accepted.
Start With the Working Interface
Review the cable or shaft, panel opening, groove and closure together. Agree sealing-lip geometry, flash limits and installation condition before evaluating the assembly.
Define the check: fluid, pressure or immersion condition, duration, sample count and leakage criterion.
Separate molded wall control from opening formation and any coating. Functional samples should represent the slit, finishing and housing configuration you intend to use.
Define the check: opening pressure, reverse sealing and flow at a stated pressure differential and test medium.
Review membrane thickness, transition geometry, supported area and stroke. Cavity-aware inspection can expose variation that a single average would hide.
Define the check: assembled sealing and fatigue are separate requirements, with completed checkpoints distinguished from open targets.
Have a drawing, an existing sample or an unresolved interface question? Start with the information available and identify the remaining decisions.
Review Your LSR ProjectSelected project records
Explore the problem, manufacturing decisions and reported checks. Each case keeps its test conditions and current project stage in view.
200-piece pilot · customer validation ongoing
100-piece pilot · validation ongoing
2,000-piece pilot · endurance validation ongoing
What is Liquid Silicone Rubber (LSR)
Liquid silicone rubber is supplied in grades with different mechanical, processing and application requirements. Specify the manufacturer and exact grade, including colorants or additives, so the material data and intended use can be reviewed together.
The checklist is for quotation review, not a universal LSR specification. Values on a supplier data sheet must be read with their test method and specimen conditions; finished-part acceptance is agreed separately.
| Requirement | Define in the RFQ | Verify Against |
|---|---|---|
| Grade and hardness | Exact grade, color and target hardness | Current supplier data and agreed test method |
| Mechanical behavior | Loads, tear risks and seal compression | Grade data and part-specific functional checks |
| Exposure | Temperature, fluids, duration and cleaning cycles | Supplier guidance and agreed aging tests |
| Contact suitability | Contact type, duration and intended use | Applicable material records and finished-device assessment |
| Cure and finishing | Post-cure, trimming and cleanliness needs | Selected-grade instructions and agreed process records |
| Part acceptance | Dimensions, flash, appearance and function | Conditioned samples and approved acceptance criteria |
For example, WACKER's SILPURAN 6000/20 A/B product information describes selected biocompatibility tests, use limitations and processing conditions for that specific grade. It also states that the material is not supplied sterile. This reference explains how to review documentation; it is not a claim that this grade is stocked or used in your order.
The FDA's biocompatibility assessment guidance considers the finished device, its processing and sterilization where applicable, as well as the type and duration of body contact. Agree the evidence and responsible parties for your intended use before approving production.
LSR Injection Molding Expertise
The selected manufacturing partner matches the liquid silicone injection cell, metering system, mold and part-removal method to the project. Press size, shot weight and capacity are confirmed for the actual part.
We review the silicone grade, hardness, color, service temperature and contact requirements with you. Medical or food-contact applications require documentation for the exact material and intended conditions of use.
LSR mold design and manufacture are coordinated with the production partner. Gate placement, venting, runner design, flash limits and drawing tolerances form part of the tooling review.
Post-curing, deflashing, marking, assembly and packaging can be included in the quotation. The agreed process defines which operations are performed and how finished parts are accepted.
If controlled packaging or sterilization compatibility is required, specify it with the RFQ so the production and testing scope can be reviewed.
FECISION helps coordinate production-site qualification for the agreed manufacturing scope.
The relevant records depend on the selected site and process. A project review can establish which of the following records are required:
FECISION coordinates LSR molding onto suitable plastic or metal substrates. The manufacturing partner reviews the material pairing, substrate heat resistance, tooling sequence and retention features before recommending insert overmolding or another suitable process.
Request A QuoteCandidate substrates include suitable engineering plastics and metals. Adhesion depends on the exact LSR and substrate grades, surface condition and molding process.
Substrate surface activation is specified based on the material pairing and validated before production release.
Overmolding can reduce assembly operations. Chemical adhesion must be confirmed with the selected grades and process; mechanical interlocks may be needed where the bond alone does not meet the requirement.
Partner production resources
Preparation matched to silicone process
Partner LSR injection equipment
Shot size and capacity reviewed per project
Partner finishing resources
Trim method matched to part geometry
Partner finishing resources
Flash acceptance defined on the drawing
Partner thermal-processing resources
Cycle specified for the selected grade
Medical LSR projects require review of the exact silicone grade, contact type and duration, processing and sterilization conditions. FECISION coordinates the selected manufacturing partner and agreed records; material test data alone do not establish finished-device biocompatibility.
Potential applications include diagnostic-equipment seals, diaphragms, valve components and instrument grips. Patient-contact or drug-contact components need an application-specific material and validation review before the manufacturing scope is confirmed. A medical-use label does not establish suitability for every contact condition.
See MoreLSR is increasingly used in electronics due to its soft-touch feel, durability, water resistance, and ability to be molded into intricate designs.
Keypads and Buttons for remote controls, mobile phones and other electronic devices; Seals and Gaskets for portable electronics, wearables and outdoor equipment; Protective Coverings and Casings for smart devices; Components for Wearable Technology like Wristbands Seals and Sensor Housings
See MoreFecision serves various industrial sectors with LSR components designed for reliability and performance in demanding operational environments. These applications often require resistance to chemicals, extreme temperatures, and mechanical stress.
Seals, Valves, Membranes for industrial equipment, pumps and fluid handling systems; Gaskets and O-rings for a wide range of industrial machinery and processing equipment; Electrical Insulators and Connectors
See More
Your Strategic Partner for LSR Injection Molding Success
Medical and automotive requirements are matched to the selected partner site and its certified scope. ISO 13485, IATF 16949 and other applicable standards are reviewed alongside the actual process and material requirements.
FECISION coordinates the drawing review, silicone selection, tool design and sampling plan with the manufacturing partner. Critical dimensions and acceptance criteria are agreed before tooling begins.
The production cell and any controlled-environment operations are selected for the application. Cleanroom classification, monitoring records and packaging scope are reviewed when the project requires them.
The quotation identifies tooling milestones, sample quantities, inspection reports and any additional validation work. Lead time depends on geometry, material availability and the agreed qualification program.
Project Quality Planning
From requirements to release
Soft-part geometry and assembled performance need different checks. The project review links the compound, mold and finishing route to the samples your team will evaluate.
Part and mating drawings, compound or hardness target, contacting media, temperature, compression or motion, cleanliness needs and intended sample tests.
A review of the exact compound, flash-sensitive regions, parting line, venting and release geometry.
Decision to agreeIdentify sealing lips, flexible membranes and other functional surfaces that cannot be changed freely.
Identified samples in the agreed finished state, including specified post-cure, trimming or other secondary operations.
Decision to agreeDefine support fixtures and measurement methods so deformable features are checked consistently.
The quoted dimensional and component-test records, with sample count and test configuration.
Decision to agreeKeep completed component checks separate from customer system, lifetime or biological evaluation.
An approved compound, drawing, finishing sequence and inspection reference.
Decision to agreeReview formulation, process or mating-part changes before carrying earlier results into a new configuration.
Take the next step towards realizing your high-performance Liquid Silicone Rubber components.
We are committed to providing tailored solutions that meet your specific application needs and project timelines.
Send the silicone-part drawing together with the mating groove, panel, cable, housing or pump-head geometry. Include the exact material requirement or candidate grade, fluid exposure, assembly condition, target quantities and the proposed acceptance test. A loose-part dimensional check and a finished-assembly sealing check are quoted as separate tasks.
The quotation defines the tooling scope, trial quantities, manufacturing operations and inspection deliverables. Review the DFM actions and material decision before authorizing tool work. Trial samples are evaluated in their specified finished state, and any remaining customer validation is identified before the production-release decision. Tool ownership, storage, maintenance and transfer terms are agreed in writing rather than assumed.
The documentation package is agreed during quotation. It can include material lot records, dimensional inspection, traceability and specified validation deliverables. IQ/OQ/PQ scope and acceptance criteria are reviewed with the selected production site when required.
Tooling and sampling dates are confirmed after the part, silicone grade, cavity count and validation requirements have been reviewed. Share your target launch date so the quotation can identify the relevant milestones.
We coordinate a review of the relevant site qualifications, manufacturing scope and project quality records. Any further document sharing or site review is arranged according to supplier authorization and the agreed confidentiality scope.
Send your trial quantity, expected annual volume and part drawing. We assess the tooling investment, material purchase, cycle and finishing requirements to recommend a practical batch size and production approach.
Review each component with its mating interface and acceptance requirements. Component inspection and complete-system qualification remain distinct parts of the project.
Custom LSR silicone cable grommets made to your panel and cable design. Review sealing geometry, tooling, molding, inspection and assembly validation.
Review the application →
Custom LSR silicone duckbill valves made to your design. Review lip geometry, housing fit, slit finishing, opening pressure and reverse-sealing tests.
Review the application →
Custom molded LSR diaphragms for pump and valve assemblies. Review membrane thickness, stroke, clamping, fluid exposure and validation with FECISION.
Review the application →
Custom liquid silicone rubber gaskets and seals made to your design. Review groove fit, compression, exact grade, flash zones and acceptance.
Review the application →
