Compression Molding: Precision Silicone Parts for High-Volume Manufacturing
At LSRParts, we deliver reliable, high-volume silicone components through advanced compression molding. Unlike injection molding, which suits smaller or more complex parts, compression molding excels when consistent thickness, large flat or contoured surfaces, or demanding performance specifications are required.
Our compression molding process produces durable, repeatable parts that maintain tight tolerances and sealing integrity across millions of production cycles. We support prototype to mass-production runs for demanding applications in automotive, medical, electronics, food, and industrial sectors.
Why Compression Molding for Your Silicone Components
Compression molding offers key advantages for customers who need:
Material & Surface Excellence
- Excellent material uniformity and low flash
- Superior surface finish on large or complex geometries
Performance & Scalability
- Proven performance in high-pressure or thermal environments
- Cost-effective scaling from prototype to high-volume production
Our team ensures every part meets your exact drawing requirements through precision mold design, material selection, and production validation.
Our Compression Molding Capabilities
Technical specifications for precision silicone compression molding.
Process
Liquid silicone rubber (LSR) compression molding
Maximum Part Envelope
2500 × 2000 × 1000 mm
Typical Part Tolerance
- ±0.2 mm (small parts)
- ±0.1–0.2 mm (small part molds)
- ±0.3–0.5 mm (complex part molds)
Part-to-Part Repeatability
Approximately ±0.1 mm
Mold Cavities
Single-cavity or multi-cavity
Mold Life
Up to 3–5 million shots (tooling and application dependent)
Mold Materials
P20, H13, or 420 Stainless Steel
Secondary Operations Supported
Post-curing, precision trimming, die cutting, punching, X/Y slitting, valve slitting, pad printing, silk screening, laser marking, drilling, bonding, assembly, and functional testing
From Design to Production
Our proven workflow for compression molding projects includes:
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1
DFM Review & Material Selection
Early risk identification and design optimization
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2
Mold Design & Tool Manufacturing
Precision tooling built for your production requirements
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3
T0/T1 Sampling & Validation
First articles validated against your specifications
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4
Production Approval
Formal sign-off before mass production begins
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5
Mass Production
Stable, repeatable parts at high volume
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6
Final Inspection & Assembly/Packaging
Quality verification and ready-to-ship packaging
Material Options for Compression Molding
We offer a wide range of platinum-cured and peroxide-cured LSR compounds tailored to your application:
General Purpose LSR
Ideal for industrial and electronics applications
Medical Grade & Platinum-Cured Silicone
Suitable for medical devices, food contact, and healthcare equipment
Food Grade LSR
Certified for food, beverage, and baby-care products
Fluorosilicone
Excellent chemical resistance for automotive and fuel applications
High & Low-Temperature Silicone
Suitable for outdoor, automotive, and industrial environments
Conductive & Flame-Retardant Silicone
For EMI shielding, thermal management, and electrical safety
Custom compounds are available to meet specific hardness (10–80 Shore A), color, and performance requirements.
Applications We Support
Compression molding is the preferred method for a wide range of demanding applications.
Automotive & EV
Connector seals, wire seals, battery seals, sensor seals, and diaphragms
Medical & Healthcare
Septa, plunger tips, valves, diaphragms, tubing, and device seals
Pumps, Valves & Fluid Control
Membranes, check valves, and sealing components
Electronics & Sensors
Waterproof seals, housing seals, keypads, and overmolded parts
Food, Beverage & Baby Care
Bottle valves, breast pump parts, food-grade seals, and tubing
Ideal Customer Profile
LSRParts focuses on OEMs and Tier suppliers with annual demand above 100,000 pieces who require:
- Custom drawings or 3D files
- New tooling programs
- Prototype-to-mass-production support
- High-precision or functional performance
- Reliable DFM review and engineering collaboration
We prioritize high-value, repeat-production silicone components over low-volume commodity parts.
Why Choose LSRParts for Compression Molding
✓ Production-ready quality
Consistent dimensional control and material performance
✓ Full in-house support
From initial DFM through sampling, validation, and mass production
✓ Flexible tooling
Prototype (aluminum) to production (hardened steel)
✓ Scalable volumes
Prototype to high-volume with proven repeatability
✓ Multiple secondary operations
In-house trimming, bonding, marking, assembly, and testing
Ready to Start Your Compression Molding Project?
Whether you need large flat membranes, complex multi-cavity seals, or high-performance diaphragms, LSRParts delivers custom compression-molded silicone parts that meet your exact specifications and production requirements.
Contact LSRParts Today
Our engineering team is ready to review your drawings and recommend the optimal material and process for your application.