# Precision Fused Silica Capillary
Micro Quartz Capillary Tubes & Fused Silica Rods
Optical Connectors, Optical Fiber Splices, Fiber Supports, PLC Splitter, WDM, Optical Fiber Collimator, Fiber Optic Sensor (FOS), Optical Fiber Communication Systems
Worldwide Shipping
Orders accepted worldwide and eligible orders ship free to anywhere in the world
Fast Secure Dispatch
Rapid dispatch on in-stock items via tracked courier. Short custom leadtime
Quality Assured
Door to door shipping offered. Breakage will be replaced by new delivery or refund
Micro Quartz Capillary Tube Shapes
Circular, square, rectangular, D-shape, multi-hole and more
Micro Quartz Capillary Tubes Available for Custom Fabrication
Micro quartz capillary tubes and fused silica rods from MachinedQuartz are precision-drawn from high-purity fused silica (≥99.99% SiO₂). Available in a comprehensive range of cross-sectional geometries, all in stock or custom-fabricated to your drawing.
- Circular Quartz Capillary Tubes — standard bore, thin/standard/thick wall configurations
- Square Quartz Capillary Tubes — flat optical interface for microfluidics & flow cytometry
- Rectangular Quartz Capillary Tubes — custom width-to-height ratios available
- Outer Square / Inner Circular Capillaries — for fiber optic ferrules & splice sleeves
- Outer Circular / Inner Square Capillaries — specialty optical coupling applications
- D-Shape Quartz Capillary Tubes — flat face for bonding & evanescent-wave sensing
- Multi-Hole Quartz Capillaries — parallel channels for microfluidic separation & ribbon connectors
- Specialty Shapes: triangular, hexagonal, oval, eccentric — custom cross-sections available
- Solid Fused Silica Rods — circular & square, for optical light guides & laser beam homogenizers
General Specifications & Tolerance
- Outer Diameter (OD): 0.5 mm to 8 mm (tighter tolerances on request)
- Inner Diameter (ID): from 0.09 mm (90 µm) to specified dimension
- Length: 1 mm to specified — cut-to-length available
- OD/ID Tolerance: ±1.5% to ±3% standard; precision grade ±1% available
- Material: Fused silica (≥99.99% SiO₂), natural quartz, borosilicate, opaque quartz
- UV Transmittance: >80% at 190 nm; visible >93%
- Max Continuous Use Temp: 1,100°C; short-term to 1,450°C
Circular Tubes
Quartz Capillary Tubes
Square Tubes
Quartz Capillary Tubes
Square Tubes
Quartz Capillary Tubes
Special Tubes
Quartz Capillary Tubes
Rectangular Tubes
Quartz Capillary Tubes
Square Tubes
Inner Circular Shape
Special Rods
Quartz Capillary Rods
Special Tubes
Quartz Capillary Tubes
Multi-hole Tubes
Quartz Capillary Tubes
Head Closed Tubes
Quartz Capillary Tubes
Square Tubes
Quartz Capillary Tubes
Circular Tubes
Quartz Capillary Tubes
Square Tubes
Quartz Capillary Tubes
Multi Pore Tubes
Quartz Capillary Tubes
Circular Rods
Quartz Capillary Tubes
Square Tubes
Quartz Capillary Tubes
D shape Rods
Quartz Capillary Tubes
Triangular Tubes
Quartz Capillary Tubes
D Shaped Tubes
Quartz Capillary Tubes
Circular Tubes
Quartz Capillary Tubes
Custom Tubes
Quartz Capillary Tubes
Rectangular Tubes
Quartz Capillary Tubes
Why Choose Us
Instock Quartz Capillaries
High Puriry Micro Quartz Capillary Tubes & Rods
Circular Capillary Tubes
Ciruclar Square Tubes
Square Capillary Tubes
Square Round Tubes
Rectangular Capillary Tubes
Eccentric Capillary Tubes
D Shape Capillary Tubes
Multi Pore Capillary Tubes
Circular Quartz Capillary Rods
Square Quartz Capillary Rods
About Machined Quartz
With over 15 years of expertise in quartz glass capillaries, we are able to provide trustworthy quality products.
We are committed to the administration's efforts in obtaining ISO 9001: 2008 quality system certification and RoHS certification, as well as widespread recognition and customer recognition based on consistent quality, mass manufacturing, and low prices.
Key Applications for Quartz Capillary Tubes & Rods
- Fiber Optic Connectors & Telecom — FC, SC, ST, LC ferrules; PLC splitters; WDM components; fiber collimators
- HPLC & Capillary Electrophoresis (CE) — column blanks, UV-transparent bore for on-column detection
- Microfluidics & Lab-on-a-Chip — channel building blocks, droplet generation, cell sorting, PDMS bonding
- X-Ray Diffraction (XRD) — Debye-Scherrer & capillary transmission geometry sample holders
- Gas Chromatography (GC) & ICP-MS — column blanks, sample introduction capillaries, flow injection analysis
- Biomedical & Life Sciences — DNA sequencing arrays, patch-clamp micropipettes, drug delivery research
- UV/Vis Spectroscopy — flow cells, optical waveguides, transmission windows from 190 nm
Note: our products are limited to laboratory research use only.
Why Choosing Quartz Capillaries?
There is no other material that is comparable to quartz capillary tubing in terms of precision, uniformity, and inner diameter consistency throughout production batches and lengths.
Quartz capillary tubes and rods will play an increasingly essential role in various industries as cutting-edge technology becomes more miniaturized.
- Ultra-high UV transmittance: >80% from 190 nm — ideal for UV spectroscopy & photochemical applications
- Broad spectral transmission: 190 nm to 2,500 nm (UV-Vis-NIR)
- High temperature resistance: continuous use to 1,100°C; short-term to 1,450°C
- Exceptional chemical durability: resistant to most acids, solvents & biological fluids
- Near-zero thermal expansion: CTE ~0.55 × 10⁻⁶/°C — stable under thermal cycling
- Outstanding surface finish: excellent polishing for low-scattering optical interfaces
- Purity: ≥99.99% SiO₂ — minimal contamination risk for analytical & biomedical use
Why Choose MachinedQuartz for Your Capillary Tubes?
With over 13 years of precision quartz fabrication experience, MachinedQuartz is trusted by laboratories, universities, and OEM manufacturers across 50+ countries.
| Capability | MachinedQuartz | Typical Supplier |
|---|---|---|
| Custom Cross-Sections | ✔ 9+ shapes (circular, square, D-shape, multi-hole…) | ✘ Circular only |
| Minimum ID | ✔ From 90 µm | ✘ Usually ≥ 0.5 mm |
| Material Grade | ✔ ≥99.99% SiO₂ fused silica | ✘ Standard quartz glass |
| Lead Time (Custom) | ✔ 7–15 business days | ✘ 4–8 weeks |
| MOQ | ✔ No minimum — samples welcome | ✘ Often 100+ pcs |
Frequently Asked Questions — Micro Quartz Capillary Tubes
Q: What is the minimum order quantity (MOQ) for custom quartz capillary tubes?
A: There is no strict MOQ. We supply from single prototype pieces up to large production runs. Sample orders are welcome and help ensure the specification is correct before full production.
Q: What is the lead time for custom-fabricated quartz capillary tubes?
A: Standard sizes typically ship within 3–5 business days. Custom fabricated capillary tubes — including non-circular cross-sections or tight-tolerance IDs — usually require 7–15 business days depending on complexity and volume.
Q: What cross-sectional shapes are available for quartz capillary tubes?
A: We fabricate nine standard shapes: circular (round), square, rectangular, D-shape, multi-hole, oval (elliptical), triangular, flat/slab, and hexagonal. Custom profiles are also available on request.
Q: What is the difference between fused silica and natural quartz?
A: Fused silica (synthetic fused quartz) is manufactured from ultra-pure SiO₂ (≥99.99%) under controlled conditions, giving superior UV transmission down to 190 nm and lower OH content variation. Natural quartz may contain trace impurities that affect optical and thermal performance. Our capillary tubes use high-purity fused silica for maximum consistency.
Q: Can you provide dimensional certificates and material traceability?
A: Yes. We provide dimensional inspection reports and material certificates for each order. Traceability documentation is available upon request for regulated industries such as pharmaceuticals, medical devices, and aerospace.
Q: Do you ship internationally?
A: Yes. We ship worldwide via FedEx and UPS. Orders over US$200 qualify for free shipping. Duty-free delivery options are available to the USA. We have customers in over 50 countries including the USA, Germany, Japan, South Korea, and the UK.
Q: What tolerances can you achieve on the inner diameter (ID) of quartz capillaries?
A: Our standard tolerance on ID is ±0.01 mm. For precision applications such as HPLC columns, fiber optic connectors, and XRD capillaries, tighter tolerances down to ±0.005 mm are achievable. Please specify your requirements at the time of enquiry.
We are ready to help
We are committed to serving our customers' requirements and are available to speak with them directly at any time. This provides more personalized service and allows us to quickly resolve any issues. Quick responses to estimates and inquiries are a crucial element of the sales team's job, as is maintaining competitive pricing for the repeat business we receive year after year.
How can we help you?
Our goal is to supply high-quality optical components and glasses, and we also believe that customer service is essential to our business.