Custom Silicone Components
Waterproof Seals for Custom Silicone Components
We manufacture custom waterproof seals for OEMs and Tier suppliers that need reliable sealing performance in production environments. Our focus is not on standard catalog parts. We build silicone sealing components around your drawing, application, material requirements, and annual demand so you can move from RFQ to validated production with fewer design changes and less sourcing risk.
If you need sealing parts that must hold dimension, resist water ingress, and stay consistent across repeated production runs, we can support your program from DFM review through tooling, sampling, validation, mass production, secondary operations, and final inspection.
What you get from our waterproof seal manufacturing
When customers come to us for waterproof sealing parts, they usually want more than a molded component. They need a part that helps them:
Reliability in Assembly
Reduce leakage risk in assembly with parts engineered for consistent compression and sealing performance.
Production Consistency
Keep sealing performance stable across production lots with controlled tolerances and repeatable molding processes.
Faster Time to Production
Shorten time spent on tooling corrections through thorough DFM review before mold design begins.
Material Matching
Match material performance to the working environment, whether that involves heat, chemicals, or repeated compression cycles.
Simplified Validation
Simplify validation before mass production with early risk identification and structured sampling processes.
Assembly Repeatability
Improve repeatability in assembly and final product testing with parts designed for your specific application.
Typical applications
We supply waterproof sealing components for demanding environments where fit, compression set, tolerance control, and material reliability affect the final product.
If your project needs custom geometry, integrated features, or overmolding onto plastic or metal substrates, we can support that as part of the RFQ review.
Why customers request RFQs from us
Our customers usually contact us when they need a custom silicone sealing part with engineering support, controlled tolerances, and a supplier that can handle tooling and production together.
A custom silicone sealing part based on CAD or drawing
Engineering support before tooling starts
Prototype sampling before full release
Repeat production above 100,000 pieces per year
Controlled tolerances for functional sealing
A supplier that can handle tooling and production together
Early DFM review matters. For sealing parts, a small issue in wall thickness, draft, flash control, or compression design can affect water resistance later. We review those details before mold design starts so you can avoid unnecessary rework after sampling.
Manufacturing capabilities for waterproof seals
We build waterproof seal programs using liquid silicone rubber molding, silicone compression molding, overmolding, and extrusion depending on part shape, volume, and performance target.
LSR Injection Molding Capability
| Process | Liquid Silicone Rubber Injection Molding |
| Maximum Part Envelope | 300 × 200 × 100 mm |
| Silicone Hardness | 10–80 Shore A |
| Typical Part Tolerance | ±0.05 mm |
| Critical Tolerance | Down to ±0.02 mm, application dependent |
| Mold Manufacturing Tolerance | ±0.01 mm |
| Part-to-Part Repeatability | Approx. ±0.1 mm, geometry dependent |
| Mold Cavities | Single-cavity / Multi-cavity |
| Production Mold Life | 3–5 million shots, tooling/application dependent |
| Mold Materials | P20 / H13 / 420 Stainless Steel |
| Surface Finish | Custom texture / matte / polished |
| Automated Molding | Available |
| Secondary Operations | Post-curing, trimming, printing, laser marking, bonding, assembly, etc. |
LSR Overmolding Capability
| Maximum Part Envelope | 300 × 200 × 100 mm |
| LSR Hardness | 10–80 Shore A |
| Mold Tolerance | ±0.01 mm |
| Typical Part Tolerance | ±0.05 mm |
| Substrates | PC, PA, PBT, PPSU, PPA, PEI, aluminum, stainless steel, brass, copper |
| Bonding | Chemical / mechanical bonding strategy |
| Insert Molding | Supported |
| Post Processing | Post-cure, trimming, printing, marking, assembly |
Silicone Extrusion Capability
| Products | Tubing, cords, strips, custom profiles, multi-lumen tubing |
| Tubing OD | 0.5–120 mm |
| Standard Cross-Section Tolerance | ±0.05 mm |
| Precision Cross-Section Tolerance | ±0.03 mm |
| Wall Thickness | 0.3–15 mm |
| Length | Cut-to-length / Continuous coils |
| Maximum Continuous Coil | Up to 1,000 m |
| Curing | Hot air / Salt bath / Microwave / Steam |
| Production Volume | Prototype to 1M+ meters/year |
Material options for sealing performance
We help customers choose materials based on temperature, water exposure, compliance needs, and end-use environment. For waterproof sealing parts, the right compound choice can help your product maintain sealing performance in heat, humidity, chemicals, or repeated compression cycles.
| Material | Typical Target Applications |
|---|---|
| General Purpose LSR | Industrial / electronics |
| Medical Grade LSR | Medical devices |
| Food Grade LSR | Food / beverage / baby |
| Platinum-Cured Silicone | Medical / food contact |
| Optical LSR | Optical / lighting |
| Fluorosilicone | Automotive / fuel / chemical exposure |
| High-Temperature Silicone | Automotive / industrial |
| Low-Temperature Silicone | Outdoor / automotive |
| Electrically Conductive Silicone | Electronics / EMI |
| Thermally Conductive Silicone | Thermal management |
| Flame-Retardant Silicone | Electrical / automotive |
| Custom Compounds | Application specific |
Secondary operations that support production readiness
A sealing part often needs more than molding. We support finishing steps that help the part fit into your assembly process and reduce downstream surprises during assembly or final system validation.
- Post-curing
- Precision trimming
- Die cutting
- Punching
- X / Y slitting
- Valve slitting
- Pad printing
- Silk screening
- Laser marking
- Drilling
- Bonding
- Dipping
- Cutting and coiling
- Assembly
- Functional testing
- Inspection
- Custom packaging
Our workflow from RFQ to mass production
We follow a structured process so you can evaluate risk early and move forward with clearer expectations.
Risk Identification
Identify design risks before tooling is committed.
Material Comparison
Compare material options against real application needs.
Faster Sampling
Receive samples for fit and sealing checks sooner.
Performance Validation
Validate part performance before volume release.
Scalable Production
Scale production with less disruption to your schedule.
What to send with your RFQ
To help us quote accurately, please share as much of the following as you can:
- 2D drawing or 3D CAD file
- Material requirement or working environment
- Expected annual volume
- Target hardness or sealing condition
- Tolerance requirements
- Color and surface finish request
- Overmolding or insert details if applicable
- Testing or validation standard, if any
- Packaging or assembly requirements
If you only have a concept stage design, we can still review the geometry and recommend a practical path to tooling and sampling.
Why LSRParts
We are a custom silicone components manufacturer built around production programs, not commodity stock parts. Our customers work with us when they need a sealing component that combines:
- 1 Custom geometry
- 2 Engineering support
- 3 Repeatable production
- 4 Tooling and manufacturing under one process
- 5 Multiple material and process options
- 6 Secondary operations aligned with final assembly
For waterproof seals, that means you get a supplier who can look at the part as part of the full product system, not only as a molded item.
Request a quote
If you are sourcing waterproof seals for a new program or replacing an existing supplier, send us your drawing or CAD file and tell us your target application. We will review the design, materials, tooling approach, and production needs, then come back with a practical RFQ response.
Send your RFQ to start a custom sealing review today.