Liquid Silicone Rubber Injection Molding
Custom medical and consumer-grade LSR parts with consistent cosmetics and traceable quality.
- Materials & hardness: Shore A 10–80; transparent, tinted, and optical-grade options
- Capabilities: micro/thin-wall, LSR-to-thermoplastic overmolding, cold runner/valve gate, controlled-environment production
- Quality & delivery: full lot traceability from incoming material to shipment; FAI and dimensional reports available
Certifications ISO 9001:2015 | ISO 13485 | CTQ Inspections | ITAR
Custom Liquid Silicone Rubber Molding Services
Our LSR injection molding service turns your CAD into production-grade silicone rubber parts in 15 days.
What we commonly build
- IP-rated seals & gaskets (O-rings, frames, diaphragms)
- HMI components: keypads and soft-touch buttons
- LSR-to-thermoplastic overmolded grips on PC/PA/PP
- Transparent/tinted windows and light-transmitting logos
- Medical & baby-care contact parts with documented materials
All available across Shore A 10–80 with full lot traceability; FAI/dimensional reports on request.
Kemal LSR Injection Molding Capabilities
| Capabilities | Details |
|---|---|
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Lead time |
Prototypes from 1–3 business days with 24-hour DFM feedback; production tools in 2–5 weeks
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Production options |
Domestic and international manufacturing; pilot to multi-cavity series |
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Machines available |
Single, family, and multi-cavity LSR tools; side actions and hand-loaded cores |
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Inspection & documentation |
FAI and dimensional reports; optional PPAP, CoC, RoHS/REACH statements |
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Quality system |
ISO 9001; full lot-level material and process traceability |
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Tool ownership |
Customer-owned with documented maintenance plan
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Mold cavity tolerances |
±0.005″ (±0.127 mm) on cavity machining, plus ±0.002″ per inch (±0.05 mm/25 mm) of nominal dimension to account for shrink. Critical features are cut steel-safe and finalized after T0/T1.
Note: Actual limits depend on grade, Shore A, and process window; confirmed at DFM. |
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Part-to-part repeatability |
±0.10 mm (±0.004″) ; Cpk ≥ 1.33 on critical dimensions |
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Available mold types |
Aluminum or steel; cold runner/valve gate; vacuum vents; prototype to Class 101–105 production grades |
Manufacturing Specifications
Capability | US | Metric |
|---|---|---|
Max part size (L×W×H) | 29 in × 18 in × 14 in | 737 mm × 457 mm × 356 mm |
Max projected mold area | 120 sq in | 7742 sq mm |
Max part volume | 59 cu in | 967.6 cu cm |
Max depth from parting line | ≤ 4 in; deeper parts limited to smaller outline | ≤ 101.6 mm; deeper parts limited to smaller outline |
Minimum wall thickness* | 0.040 in (1.016 mm) for most thermoplastics | 1.016 mm |
Minimum hole/slot | 0.040 in / 0.020 in | 1.016 mm / 0.508 mm |
Draft (texture / polished)**
| ≥ 2° / ≥ 1°
| ≥ 2° / ≥ 1° |
Typical production tolerance*** | ±0.003 in/in cosmetic features | ±0.076 mm per 25.4 mm cosmetic features |
- Actual minimums depend on geometry and Shore A and will be confirmed during DFM;
- Optical/transparent zones may need dedicated gating and polish specs.
- Critical features are validated per drawing via FAI and capability studies (Cpk on request).
Liquid Silicone Rubber Materials
We supply and qualify medical-, consumer-, optical-, and specialty LSRs across Shore A 10–80. Every lot is documented for traceability (TDS, CoA, batch records).
Material type | Shore A range | Key attributes | Sterilization* | Typical uses |
|---|---|---|---|---|
Standard LSR | 30 / 40 / 50 / 60 / 70 | General-purpose, stable cosmetics, good tear | ETO, Steam, Gamma | Seals, gaskets, buttons |
Medical-grade LSR | 10–80 | ISO 10993/USP-class candidates, low volatiles, traceable | ETO, Steam, Gamma (grade-specific) | Grips, valves, patient-contact parts |
Optical-grade LSR | 20–70 | High transmission, low haze/yellowness, polishable | ETO, Gamma | Light pipes, indicator windows, logos |
Self-adhesive LSR | 20–70 | Bonds to PC/PA/PP with designed interlocks | — | Overmolded grips, seals on plastics |
Fluorosilicone (FVMQ) | 40–80
| Fuel/oil resistance, low swell | — | Auto/industrial seals in hydrocarbons |
High-tear / low-compression-set LSR
| 30–70 | Durable under flex and compression | ETO, Steam | Diaphragms, long-life seals |
Note: Share your target Shore A, sterilization method, and substrate (if overmolding). We’ll recommend a validated grade and provide the documentation package.
Our Surface Finish Capabilities
Finish code | Mold surface spec | Typical look on LSR | Best for | Notes |
|---|---|---|---|---|
SPI-A2 (High polish) | #2 diamond buff | Water-clear / glossy | Optical windows, light pipes, logo lenses | Gate/parting line kept away from optics; corner radius required; may increase demold force. |
SPI-B1 (Satin) | 600-grit paper | Low gloss / smooth | Consumer-facing cosmetics, keypads, buttons | Good balance of look vs. cost; hides minor knit lines. |
SPI-C1 (Matte) | 600-grit stone | Matte | General housings, non-optical surfaces | Lower cost; helps reduce visible scuffing. |
BB-1 (Light bead-blast) | Fine media over SPI-C1 | Fine texture for grip | Soft-touch grip zones, covers | Texture can mask flow marks; requires vacuum venting to avoid micro-bubbles. |
BB-2 (Medium bead-blast)
| Medium media over SPI-C1 | Deeper matte texture | High-grip areas |