Engineering precision into every custom silicone part — from high-speed CNC mold making and EDM finishing to scientific LSR injection, cleanroom processing and SPC-driven quality control.
Tooling designers, process engineers and quality specialists work together to scale from single-cavity prototype molds to high-cavity automated production — without losing dimensional control.
An in-house CNC toolroom with high-speed milling, mirror EDM and slow-wire EDM builds cavities in P20, NAK80 and S136 steel — holding ±0.01 mm on critical dimensions with a polished surface finish.
Closed-loop metering feeds high-shear liquid silicone into temperature-isolated cavities, with automated dosing holding injection weight within ±0.1% for repeatable, high-purity parts. Our LSR cell runs YIZUMI, ENGEL, BOY and Techen machines with 1:1 A/B metering.
Our LSR medical molding and packing area is classified ISO Class 7 (ISO 14644-1:2015) and verified by an independent third-party cleanroom testing laboratory — keeping airborne particulate under control for medical-grade and food-contact parts.
Secondary operations deliver a clean, functional surface — from cryogenic deflashing and trimming to printing, laser marking and surface treatments that prepare parts for branding and assembly.
Multi-shot and insert molding combine silicone with engineered thermoplastics — PC, PA66, PBT and more — or metal inserts, planned around substrate, bonding and temperature control during DFM.
Three-stage inspection with in-house dimensional, hardness and tensile testing, automated optical inspection (AOI) and statistical process control on critical dimensions for consistent, traceable batches.
Overmolding silicone onto a rigid substrate is a bonding-engineering problem, not just a molding problem. We plan four things up front: the substrate material, the bonding mechanism, the interface geometry and the verification test — so the joint holds in your application, not just on the sample.
We overmold silicone onto engineered thermoplastics — polycarbonate (PC), polyamide (PA66) and polybutylene terephthalate (PBT) — and onto metal inserts such as steel, brass and aluminium. The specific material grade is confirmed against the substrate's chemistry and the part's service temperature, because not every silicone bonds equally to every plastic.
We use two complementary mechanisms. Mechanical interlocking — undercuts, holes, grooves or knurled inserts that physically capture the silicone — provides the most reliable, process-independent bond. Adhesive bonding, where required, uses a primer or a self-bonding LSR grade selected for the specific substrate pair and applied under controlled conditions.
The interface geometry and molding parameters matter as much as the materials. We control substrate pre-heat and surface preparation, gate placement away from the bond line, and clamp pressure to avoid stressing the insert. DFM flags thin sections, sharp corners and insert alignment before tooling is cut.
The bond is proven, not assumed. Depending on the part we perform pull-out or peel testing on the overmolded joint, and — where the application demands it — thermal ageing or temperature-cycling tests to confirm the bond holds after exposure. Test results are documented per program and available on request.
The exact material grades, primer or self-bonding LSR selection, and the applicable pull / peel / ageing test are confirmed per part during DFM — we specify them against your drawing and service conditions rather than citing a generic capability.
Explore the full topic: Silicone Overmolding & Bonding — substrate pairing, bonding mechanisms and verification.
Photographs from our Dongguan workshop — the machines, molds and measuring systems that turn our engineering capabilities into finished parts.
High-speed CNC cuts mold cavities to ±0.01 mm before EDM finishing.
Closed-loop metering and cold-runner systems for high-purity liquid silicone parts.
Automated molding lines running compression and LSR injection around the clock.
Controlled ovens reduce volatiles and stabilize mechanical properties.
Hardness, tensile and dimensional verification with calibrated instruments.
Inspection, assembly and finishing completed under one roof.
Every number below states what it applies to, so you can compare like-for-like rather than against a headline figure.
| Capability | Equipment / Technology | Measured parameter | Applies to |
|---|---|---|---|
| Mold CNC machining | High-speed CNC milling + mirror & slow-wire EDM | ±0.01 mm cavity tolerance (cold-runner LSR ±0.005 mm) | Mold steel cavities (P20 / NAK80 / S136) |
| LSR injection | YIZUMI / ENGEL / BOY / Techen machines, cold-runner | ±0.1% shot-weight repeatability | Liquid silicone injection lines |
| LSR metering | 1:1 A/B component metering (part A + catalyst B) | Precise 1:1 ratio control | Liquid silicone mixing |
| Cleanroom | ISO Class 7 (ISO 14644-1:2015), cert. CR-2026-0714 | ≥0.5 μm: 29,800 particles/m³ | LSR medical molding & packing area |
| Color matching | Pantone / RAL reference formulation | ΔE ≤ 1.5 | Solid & liquid silicone compounding |
| Part dimensions | Precision tooling + controlled molding | ±0.1 – 0.3 mm (size-dependent) | Finished silicone parts |
| Hardness range | In-house durometer verification | Shore 20A – 80A | Solid silicone & LSR |
| Quality control | IQC / IPQC / OQC + AOI + SPC | Traceable per batch | All production lots |
Silicone is a flexible material, so finished-part tolerance is always wider than the mold cavity tolerance. Our DFM review confirms the tolerance plan before tooling so you never pay for precision you do not need.
Our liquid silicone injection cell runs a matched fleet of machines and auxiliaries, each selected for a specific part class.
| Machine | Configuration | Typical use |
|---|---|---|
| YIZUMI UN120LSR | 120T horizontal, servo, cold-runner compatible | General LSR parts |
| YIZUMI UN160LSR | 160T, large LSR parts, auto de-molding | Larger LSR components |
| ENGEL victory LSR 100 | High-precision, servo-electric | Medical micro components |
| BOY LSR 55 E | Micro-precision | Small, tight-tolerance parts |
| Techen JCLS-400-15 | Vertical, dual slide, 1:1 A/B metering | Insert & overmolding |
| KT-VS160-2S-3RT | Vertical double slide, KEBA controller | Multi-material molding |
Supporting systems: DME / Mastip cold-runner manifolds · 1:1 precise A/B metering · Yaskawa / Fanuc robotics · 80–220 °C PID post-curing ovens.
Every capability number on this site is stated against the specific thing it measures. Here is the standard we hold ourselves to — and what we invite you to verify.
We publish parameters we can support with our own equipment and records. Where a figure depends on your part — like finished-part tolerance — we say so instead of quoting a best-case number.
Mold cavity tolerance and finished-part tolerance are different things, and shot-weight repeatability is not colorant dosing accuracy. We label each so you can compare like-for-like.
We do not claim certificates we do not hold. For any number that matters to your product, we can walk you through the underlying measurement record during a DFM review or factory audit.
Permanent serial numbers, QR codes, logos and alignment marks on silicone surfaces.
Multi-color printing with abrasion-resistant inks, cured for durable branding.
Component assembly and joining to build complete, functional products.
Custom packaging, barcode labeling and master carton assembly for global distribution.
Send your drawing or specification. Our engineers will review the tooling and process route before quotation.
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