Custom silicone and rubber components - sealing, damping, protection and tactile parts
Who We Are
Zhengao Electronics is an ISO 9001:2015 certified manufacturer of custom silicone and rubber components, based in Dongguan, Guangdong, China. We are not a catalogue reseller and we do not hold stock of generic parts. Every component we ship is engineered to a customer drawing, a 3D file or a physical sample, and produced on tooling that we design and build ourselves.
Our work sits at the point where a design engineer has a sealing, insulation, damping or user-interface problem and needs a manufacturing partner who can read the drawing, argue about the material, hold the tolerance and deliver repeatably. That is the job we have done for 41+ product programmes across robotics, electronics, industrial automation and advanced equipment.
Within robotics the work concentrates on joint and enclosure sealing, where the seal has to hold while the surfaces it sits between articulate. How those parts are specified, and why a standard O-ring usually fails in that duty, is set out in robotic sealing solutions.
What We Manufacture
Our catalogue is organised around component families rather than around raw material. Each family below is a starting point — most of the work we do is a modified or fully custom version of something in the list.
Sealing Solutions
Gaskets, O-rings, enclosure seals and waterproof sealing components for enclosures, robots and electronics.
Silicone Keypads
Conductive and non-conductive silicone keypads with tactile feel, backlighting and custom graphics.
Rubber Seals
Custom rubber seals in EPDM, NBR and FKM for water, dust, chemical and temperature resistance.
Robot Components
Sealing sleeves, vibration dampers, gripper pads and protective parts engineered for robotics.
Custom Molded Parts
Fully custom silicone and rubber parts produced from your drawing, 3D file or physical sample.
What We Can Do
Manufacturing capability is the part most supplier websites leave out, and it is the part a technical buyer needs most. Below is what we actually run in-house.
| Capability | What it means for your project |
|---|---|
| Tooling & mould design | We design and build the mould for your part rather than asking you to find a toolmaker. Tooling cost refundable against volume production orders. |
| Compression moulding | The workhorse process for solid silicone and rubber parts with medium to high hardness, thick sections and low-to-mid volumes. |
| Liquid silicone rubber (LSR) | For high-precision, thin-wall and optically clear parts, and for applications that need a very long fatigue life. |
| Rubber compounding | EPDM, NBR, FKM (Viton), NR, SBR and CR selected against your temperature, chemical and weathering requirements — not against price alone. |
| Secondary operations | Deflashing, post-curing, bonding, laser marking, screen printing and sub-assembly. |
| Inspection | First-article inspection, in-process checks, dimensional inspection and material verification before shipment. |
Material options: Silicone (HTV / LSR), EPDM, NBR, FKM (Viton), NR, SBR, CR. Hardness range 20-80 Shore A. Tolerance +/-0.05 mm (moulded critical dimensions). Operating temperature -60 C to +230 C.
Who We Serve
We work with OEM engineering and procurement teams in seven application areas. The list is ordered by how much of our current engineering time each one takes.
Robotics
Sealing, protective sleeves, vibration damping, cable protection and gripper components for industrial, collaborative, service and quadruped robots.
Industrial Automation
Seals, gaskets, dampers and custom moulded parts for machinery, actuators, conveyors and control cabinets.
Electronics
Keypads, conductive pads, enclosure seals and protective components for controllers, instruments and consumer devices.
Drones & UAV
Waterproof seals, grommets, vibration isolation and cable management for airframes and camera payloads.
Automotive & EV
Silicone and rubber sealing, damping and protection parts for vehicle electronics and battery systems.
Consumer Electronics
Keypads, sleeves, feet, grips and aesthetic silicone parts for branded products.
Industrial Equipment
Heavy-duty rubber and silicone components for pumps, compressors, valves and machine frames.
Why Customers Work With Us
| What buyers worry about | How we remove that risk |
|---|---|
| "They will not understand my drawing." | Every RFQ is reviewed by an engineer, not a salesperson. We come back with material suggestions, tolerance feedback and tooling comments — not just a price. |
| "The first batch will be good and the tenth will not." | The mould and process parameters are documented and locked. Inspection data travels with the shipment. |
| "Tooling will cost me thousands before I know if the part works." | We prototype first. Tooling cost refundable against volume production orders. |
| "They will claim certifications they do not have." | We hold ISO 9001:2015 and we only state what we can evidence. If a programme needs a certification we do not hold, we say so before you commit. |
| "Communication will be slow and vague." | Engineering replies come in writing with drawings, material data and photographs. English-language technical correspondence only. |
Manufacturing Evidence
Claims are cheap. These are the artefacts we can put in front of a technical buyer on request:
- Mould drawings and tooling records for every part we have produced (NDA-protected, shared under agreement).
- Material selection sheets identifying the exact compound used for each component.
- Moulded-part inspection reports: dimensions, hardness, colour and key physical properties.
- Dimensional reports for critical characteristics on request.
- Sample and first-article submissions for approval before mass production.
- Photographic and video records of tooling, moulding, deflashing, inspection and packing.
Case Studies
Selected engineering programmes, written up from the technical problem rather than from the product photo.
Silicone Parts for a Humanoid Robot Finger
Contact and sealing components on an articulated finger, designed for wear under repeated articulation.
Gripper Protective Sleeves and Damping Parts
Sleeves that sit over the robot fingers, plus silicone damping components for robotics programmes.
Silicone Keypad for a Two-Way Radio
A handheld radio keypad built for repeated field actuation.
Product Index
A selection of 24 of our 41 current component programmes, across sealing, electronics, robotics, accessories and custom mouldings. Browse the full product library →
Silicone Cable Tie Silicone Cable Tie
Professional Silicone Cable Tie Silicone Cable Tie designed for Consumer Electronics. Features Wear-resistant , Shock-absorbing.
Silicone Shock-absorbing Shock-absorbing Rubber Anti-vibration
Professional Silicone Shock-absorbing Shock-absorbing Rubber Anti-vibration designed for Consumer Electronics. Features Anti-vibra...
Keypad P+R Keypad Waterproof Silicone Silicone
Professional Keypad P+R Keypad Waterproof Silicone Silicone designed for Consumer Electronics. Features Aesthetic Design , Wear-re...
Industrial Robot Vibration Dampening & Sealing Components
High-precision Industrial Robot Vibration Dampening & Sealing Components specifically engineered for robotics and AI applications....
Supplier Silicone Waterproof Sealing Silicone Products
Professional Supplier Silicone Waterproof Sealing Silicone Products designed for Consumer Electronics. Features Wear-resistant , S...
Silicone Gasket Silicone Foot Pad Silicone
Professional Silicone Gasket Silicone Foot Pad Silicone designed for Consumer Electronics. Features Wear-resistant , Shock-absorbi...
Custom Silicone Products Silicone Shaped Parts
Professional Custom Silicone Products Silicone Shaped Parts designed for Consumer Electronics. Features Wear-resistant , Shock-abs...
Silicone Keypad Conductive Silicone Keypad Keypad
Professional Silicone Keypad Conductive Silicone Keypad Keypad designed for Consumer Electronics. Features Wear-resistant , Shock-...
AI Robot Drone & Robo-dog Sealing Protective Sleeves
High-precision AI Robot Drone & Robo-dog Sealing Protective Sleeves specifically engineered for robotics and AI applications. Dura...
Supplier Waterproof 〇 Silicone Sealing Silicone
Professional Supplier Waterproof 〇 Silicone Sealing Silicone designed for Consumer Electronics. Features Wear-resistant , Shock-ab...
Silicone Protective Case Silicone Cup Sleeve
Professional Silicone Protective Case Silicone Cup Sleeve designed for Consumer Electronics. Features Eco-friendly , Dust-proof , ...
Rubber Rubber Silicone Custom
Professional Rubber Rubber Silicone Custom designed for Consumer Electronics. Features Wear-resistant , Shock-absorbing.
Silicone Keypad Keypad Silicone Dust-proof Keypad
Professional Silicone Keypad Keypad Silicone Dust-proof Keypad designed for Consumer Electronics. Features Custom , Excellent Tact...
Custom Intelligent AI Gripper & Robo-dog Sealing Parts
High-precision Custom Intelligent AI Gripper & Robo-dog Sealing Parts specifically engineered for robotics and AI applications. Du...
Sealing Custom Silicone Heat Resistant Waterproof
Professional Sealing Custom Silicone Heat Resistant Waterproof designed for Consumer Electronics. Features Light-blocking , Shock-...
Silicone Silicone Cup Sleeve Silicone Speaker
Professional Silicone Silicone Cup Sleeve Silicone Speaker designed for Consumer Electronics. Features Eco-friendly , Dust-proof ,...
Silicone Food Grade Silicone Waterproof Silicone
Professional Silicone Food Grade Silicone Waterproof Silicone designed for Consumer Electronics. Features Waterproof , Wear-resist...
Silicone Keypad Waterproof Silicone Keypad Custom
Professional Silicone Keypad Waterproof Silicone Keypad Custom designed for Consumer Electronics. Features Excellent Tactile Feedb...
Custom Molded Silicone Robot Parts & Shaped Components
High-precision Custom Molded Silicone Robot Parts & Shaped Components specifically engineered for robotics and AI applications. Du...
Rubber Sealing O Sealing Sealing Waterproof
Professional Rubber Sealing O Sealing Sealing Waterproof designed for Consumer Electronics. Features Wear-resistant , Shock-absorb...
Silicone Custom Protective Case Rubber Processing
Professional Silicone Custom Protective Case Rubber Processing designed for Consumer Electronics. Features durable performance.
Rubber Shaped Parts Rubber Miscellaneous Parts
Professional Rubber Shaped Parts Rubber Miscellaneous Parts designed for Consumer Electronics. Features Wear-resistant , Shock-abs...
Silicone Rubber Keypad Conductive Custom
Professional Silicone Rubber Keypad Conductive Custom designed for Consumer Electronics. Features Excellent Tactile Feedback ,.
Industrial Robot Vibration Dampening Protective Sleeves
High-precision Industrial Robot Vibration Dampening Protective Sleeves specifically engineered for robotics and AI applications. D...