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.
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
Electronics Design Discussion
The design discussion uses a connector seal and cable grommet concept to explain undercut release, flash at the plastic interface, corner radii and shrinkage compensation. Listed dimensions are discussion assumptions, not approved production specifications.
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.
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 the molded profile with its groove, closure and operating exposure. Keep component inspection separate from qualification of the complete sealing joint.
