Description
Micro-bore capillaries are defined by a very fine internal bore — the purchasing driver is the flow path diameter, not the outer dimension. This is what separates it from Precision Round Capillaries, where bore size follows from a general OD/ID/wall spec rather than being the primary design constraint.
Dimensions
| Parameter | Range |
|---|---|
| Bore diameter | 0.05 – 0.3 mm typical micro-bore range |
| OD | Sized around the bore per drawing — commonly 0.3 – 3 mm for micro-bore product |
| Wall thickness | From 0.05 mm |
| Length | Per drawing |
| Bore tolerance | ±0.01 – 0.02 mm precision custom; tighter on request |
Application Use
- Flow restriction — precise, repeatable flow resistance in analytical instruments
- Analytical / microfluidic — capillary electrophoresis, HPLC flow paths, microfluidic chip fabrication
- Fiber-related — small-diameter sleeving where the bore is smaller than standard fiber-optic capillary bore
Bore Consistency
Precision drawn on a CNC wire-drawing tower for consistent bore diameter along the full capillary length — critical for flow-rate repeatability in analytical use.
Material
UV-grade fused quartz transmits 185–2500 nm, allowing fluorescence detection and UV absorbance measurement directly through the capillary wall — relevant where the micro-bore also functions as an optical flow cell.
FAQ
What’s the smallest bore diameter available?
0.05 mm is the commonly cited lower bound for drawn micro-bore capillary; confirm feasibility against your required OD and wall thickness.
Can the capillary function as both a flow path and an optical detection cell?
Yes — UV-grade quartz transmits from 185nm, so fluorescence/absorbance measurement can be taken directly through the capillary wall without a separate optical window.
How is bore diameter held consistent over length?
Through the CNC-controlled drawing process — confirm the tolerance band you need over your specific length, as consistency can vary with draw length and bore-to-wall ratio.