Fused silica capillary tubing offers high-purity, high-temperature performance for laboratory workflows, especially in chromatography and microfluidics. This guide highlights five top options designed for precise dimensions, thermal stability, and chemical inertness. Ideal buyers include researchers needing consistent bore tolerances, technicians requiring reliable high-temperature operation, and labs seeking premium glass tubing for GC/LC applications. Below you’ll find a quick comparison table and detailed product sections to help you choose the best fit for your setup.
| Product | Best For | Key Feature |
|---|---|---|
| Fused Silica Quartz Capillary Tubing 0.02″-0.35″ (OD 9.0 mm, ID 8.0 mm, 100 mm) | Precision experiments needing tight tolerances | 99.99% purity, nano-polished surfaces, stable to 1200°C |
| Fused Silica Quartz Capillary Tubing 0.02″-0.35″ (OD 9.0 mm, ID 7.0 mm, 100 mm, 10 pcs) | Batch projects with multiple capillaries | Same high purity and thermal performance as single-piece |
| Fused Silica Quartz Capillary Tubing 0.02″-0.35″ (OD 9.0 mm, ID 6.0 mm, 100 mm, 10 pcs) | Smaller bore needs and bulk purchases | Precise CNC machining, burr-free edges |
| 064102 – Fused Silica Tubing, Phenyl Deactivated | GC/LC where chemical stability is critical | Phenyl deactivated coating, high homogeneity |
| Quartz Capillary Glass Tubes, 100 mm, 50 pcs (φ1.5 × φ0.8) | General lab usage with flexible sizing | Purity ≥ 99.99%, high temperature resistance |
Fused Silica Capillary Tubing, 0.02″-0.35″ (OD 9.0, ID 8.0, 100mm) — Shrandi
- Material Base: 99.99% pure fused silica; 95% light transmittance via nano polishing.
- Temperature Performance: Stable up to 1200°C; handles 1000°C instant differences without cracking.
- Dimension Precision: OD/ID tolerance ±0.1 mm; wall thickness uniformity error < 2%; burr-free edges.
Best for: Researchers requiring a single high-purity capillary with tight tolerances and excellent thermal stability. Limitations: Single piece may be less cost-effective for large batch runs.
Fused Silica Capillary Tubing (10 pcs, OD 9.0, ID 7.0, 100mm) — Shrandi
- Same material basis and thermal performance as the single-piece variant.
- Dimension Precision: OD/ID tolerance ±0.1 mm; flat burr-free cut edges.
Best for: Labs needing multiple capillaries with identical specs. Limitation: Slightly smaller ID may affect flow characteristics in some setups.
Fused Silica Capillary Tubing (10 pcs, OD 9.0, ID 6.0, 100mm) — Shrandi
- Smaller bore suitable for higher-resolution separations.
- Precision machining ensures uniform wall thickness and burr-free edges.
Best for: Applications requiring tighter bore control. Caution: ID reduction may affect flow rates and pressure requirements.
064102 – Phenyl Deactivated Fused Silica Capillary Tubing — Trajan
- Precision tubing with high homogeneity and chemical stability; deactivated coating reduces surface interactions.
- Best for GC capillary applications and LC tubing where inert surfaces matter.
- Limitation: Not approved for medical or patient-oriented applications.
Best for: Chromatography setups needing chemically inert surfaces. Choose this if you want reduced adsorption on the capillary walls.
Quartz Capillary Glass Tubes, 100 mm (50 pcs) — GDLKSEVEN
- Size: φ1.5 mm outer, φ0.8 mm inner; 100 mm length; 50 pieces per pack.
- Purity ≥ 99.99%; operates up to 1200°C, down to -198°C.
- Good electrical conductivity and dielectric constant ≥ 3.7; suitable for insulating parts.
Best for: Labs needing bulk capillaries with reliable high-temperature performance and basic electrical insulation needs. Limitation: Larger outer diameter may not fit all microfluidic setups.
Buying Guide
Which fused silica capillary tube is right for you?
- Temperature range: If your work involves extreme temperatures, prioritize tubes rated to at least 1200°C and stable under rapid thermal shifts.
- Inner diameter and bore tolerance: For high-precision separations, select tubes with tight OD/ID tolerances (often ±0.1 mm) and uniform wall thickness.
- Coatings and deactivation: Phenyl-deactivated or chemically inert coatings minimize interactions with analytes; useful for GC/LC applications.
- Quantity and batch needs: For protocol consistency, consider multi-pack options to ensure uniform bore across all runs.
- Material purity: Look for 99.99% purity or better to reduce contamination and improve optical transmission in light-based analyses.
- Physical compatibility: Ensure the outer diameter suits your connections, holders, and inline fittings in existing systems.
Practical tips for selection:
- If you require maximum light transmission and minimal surface interaction, nano-polished, high-purity tubes are preferred.
- For chromatography workflows, phenyl-deactivated tubes can enhance stability and reduce adsorption of analytes on glass surfaces.
- Bulk purchases are economical for large experiments; verify that all pieces share identical OD/ID tolerances to avoid flow variability.
Frequently Asked Questions
- What is fused silica capillary tubing used for?
Commonly used in chromatography (GC/LC), microfluidics, and high-temperature experiments where chemical inertness and precise dimensions are critical.
- Why choose phenyl-deactivated tubes?
They reduce interactions between the capillary surface and certain analytes, improving peak shape and stability in sensitive analyses.
- How important are OD/ID tolerances?
Very important for consistent flow rates, pressure management, and repeatable results across multiple capillaries.
- Can these tubes handle rapid temperature changes?
Yes, many options withstand large differences (e.g., 1000°C instant changes) without cracking or embrittlement when used as specified.
- Do you need a single piece or multiple pieces?
Single pieces are ideal for custom setups; multi-pack options suit bulk experiments and batch testing.
- Are all sizes suitable for GC or LC systems?
Most are suitable, but confirm bore size and coating compatibility with your instrument’s columns and connectors.
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