High-Precision Small-Diameter Plastic Tubing, Engineered to Your Requirements
Custom dimensions, tight tolerances and material options for demanding industrial applications.
High-Precision Small-Diameter Plastic Tubing
High-precision small-diameter plastic tubing is a tailored solution for precision fluid transfer, electronic protection, medical intervention, and industrial sensing applications. Leveraging advanced precision extrusion technology and closed-loop in-line control systems, we manufacture tubing with outer diameter tolerances as low as±0.05mm, smooth inner surfaces, and concentricity≥95%.
Our product materials cover two main categories: General Plastics (PP, PE, PVC, TPU, etc.), offering cost-effectiveness and balanced performance for conventional industrial and civil uses; and Engineering Plastics (POM, PBT, PA6, PA66, PA12, etc.), delivering superior heat resistance, chemical resistance, mechanical strength, and dimensional stability for demanding sectors such as automotive, electronics, aerospace, medical devices, and high-temperature/high-pressure environments. Both categories support flexible customization of inner diameters and outer diameters, with options for multi-layer co-extrusion, functional modifications, or reinforced structures. Throughout production, laser micrometers and vision inspection systems guarantee 100% inspection, while full traceability ensures process consistency, empowering customers with high-quality, reliable system integration.
High Precision Small Diameter Plastic Tubing Technical Parameters
| Material | OD(mm) | ID(mm) | Min.Thickness | Tolerance of Thickness(mm) | Tolerance of ID and OD(mm) |
| PE | 1.8-12 | 1.5-11 | ≥0.12 | ≤0.10 | ≥±0.05 |
| POM | 2.0-12 | 1.7-11 | ≥0.15 | ≤0.10 | ≥±0.05 |
| PP | 2.0-12 | 1.7-11 | ≥0.15 | ≤0.10 | ≥±0.05 |
| PBT | 2.0-12 | 1.7-11 | ≥0.15 | ≤0.10 | ≥±0.05 |
| PA6 | 2.0-12 | 1.7-11 | ≥0.15 | ≤0.1 | ≥±0.05 |
| PA66 | 2.5-12 | 2.2-11 | ≥0.35 | ≤0.10 | ≥±0.05 |
| PA12 | 2.0-12 | 1.7-11 | ≥0.35 | ≤0.10 | ≥±0.05 |
| TPU | 2.5-12 | 2.1-11 | ≥0.5 | ≤0.20 | ≥±0.075 |
| PTFE | 1.8-12 | 1.5-11 | ≥0.12 | ≤0.10 | ≥±0.05 |
| Multilayer Plastic Hose | 3.0-12 | 2.0-11 | ≥0.3 | ≤0.10 | ≥±0.075 |
Small Diameter Plastic Tubing Materials for Different Performance Requirements
Different engineering plastics provide different combinations of flexibility, strength, chemical resistance, temperature resistance and dimensional stability. Material selection should be based on the operating environment and functional requirements.
| Material | Key Characteristics | Typical Considerations |
| PE | Lightweight, flexible, chemical resistant | Fluid transfer and general industrial use |
| PP | Low density, chemical resistant | Chemical and fluid handling |
| POM | High rigidity and dimensional stability | Precision mechanical assemblies |
| PBT | Good heat resistance and dimensional stability | Automotive and electrical components |
| PA6 / PA66 | High strength, wear resistance | Mechanical and automotive applications |
| PA12 | Flexible, durable and chemical resistant | Pneumatic and compact systems |
| TPU | Flexible and abrasion resistant | Dynamic and flexible assemblies |
| PTFE | Excellent chemical and temperature resistance | Harsh chemical or high-temperature environments |
Material grades can be selected and adjusted according to required mechanical, thermal and chemical performance.
Custom Small-Diameter Plastic Tubing
Keli provides custom small-diameter plastic tubing engineered around specific application and assembly requirements. From initial drawings or samples to extrusion and final inspection, our team can adjust the tube geometry, material, structure and production specifications to meet demanding requirements.
Flexible Customization Options
- Custom Dimensions: Inner diameter, outer diameter and wall thickness can be developed to meet specific space and assembly constraints.
- Tight Tolerances: Dimensional tolerances can be engineered according to the required performance and application, with selected specifications achieving tolerances down to ±0.05 mm.
- Material Selection: PE, PP, POM, PBT, PA6, PA66, PA12, TPU and PTFE can be selected according to mechanical, thermal and chemical requirements.
- Customized Structures: Single-layer, multilayer and reinforced tubing structures can be developed when one material cannot provide all required properties.
- Customized Lengths & Packaging: Tubing can be supplied in continuous coils, specified cut lengths or customer-defined winding and packaging formats.
- Application-Specific Development: Extrusion parameters and tube construction can be adjusted to address requirements such as flexibility, dimensional stability, abrasion resistance, chemical resistance or compact installation.
From Drawing or Sample to Production
Customers can provide a technical drawing, existing sample, dimensional specification or application requirement. Keli evaluates the required material, tube geometry and manufacturing parameters, develops the appropriate extrusion solution, and verifies the finished tubing against defined quality requirements before production.
This engineering-led approach enables Keli to supply application-specific precision tubing rather than standard off-the-shelf sizes, supporting OEM and industrial customers with customized small-diameter tubing for complex assemblies.
Inner Liner Tube Manufacturing Process
Consistent tubing dimensions depend on stable extrusion conditions and accurate forming control. Keli uses a controlled production process to maintain tube geometry throughout manufacturing.
Material Inspection
Plastic Tube Extrusion
Vacuum Sizing
Haul-off(Pulling)
Baking
Winding and Cutting
Finished Product Inspection
Small-Diameter Plastic Tubing Quality Control & Inspection
Quality control focuses on dimensional accuracy, surface condition and production consistency. Inspection requirements can be adjusted according to the critical characteristics of each application.
Key Inspection Points
- Outer diameter
- Inner diameter
- Wall thickness
- Concentricity
- Roundness
- Surface appearance
- Inner-wall condition
- Dimensional consistency
Laser measurement and vision inspection can be integrated into production, while finished tubing undergoes final inspection before shipment. Production records also support product traceability.
Applications of High-Precision Small-Diameter Plastic Tubing
Used for compact fluid routing, pneumatic systems, sensor-related components and other assemblies where dimensional consistency and efficient space utilization are important.
Suitable for selected fluid-routing and compact medical equipment applications where controlled dimensions, appropriate material selection and consistent production are required.
Precision small-diameter plastic tubing can support lightweight and space-constrained systems requiring controlled dimensions, reliable mechanical performance and application-specific material properties.
Used in compact equipment and fluid-handling systems where dimensional consistency, material compatibility and clean manufacturing conditions are important.
How to Choose the Right Small-Diameter Plastic Tubing
The right tubing should be selected based on the complete operating environment rather than diameter alone.
Keli can evaluate drawings or samples and recommend a suitable tubing structure based on the application requirements.