Capillary Tube Manufacturer, Stockist & Exporter in India

Capillary Tube Manufacturer, Stockist & Exporter in India – Exotic Metals LLP

Introduction: Precision on a Microscopic Scale

At Exotic Metals LLP, our Capillary Tubes represent the pinnacle of micro-engineering. These are ultra-small diameter tubes characterized by their extremely tight dimensional tolerances and highly polished internal surfaces. Unlike standard piping or tubing, capillary tubes are defined by their internal volume and flow consistency, making them indispensable for applications where precise fluid or gas delivery is a matter of absolute accuracy.

Capillary Tube Manufacturer & Supplier in India

Manufactured through a series of specialized cold-drawing and plug-drawing processes, our capillary tubes exhibit superior concentricity and a smooth, "bore-clean" finish. As a premier manufacturer and exporter in India, Exotic Metals LLP supplies these high-precision tubes to the most demanding sectors, including chromatography, medical device manufacturing, aerospace instrumentation, and high-pressure cooling systems. We ensure that every millimeter of our tubing meets the rigorous standards required for zero-leakage and zero-clogging performance.

Technical Specification Table

Feature	Details
Outside Diameter (OD)	0.30 mm to 10.00 mm
Inside Diameter (ID)	0.10 mm to 8.00 mm
Wall Thickness	0.05 mm to 2.00 mm
Standard Specifications	ASTM A213, A269, A632, AMS 5570, EN 10216-5
Length	Straight lengths up to 6 meters or Continuous Coils (up to 500 meters)
Tolerances	OD ± 0.01 mm, ID ± 0.01 mm (Higher precision available)
Surface Finish	Bright Annealed (BA), Electropolished (EP), or Mirrored
Internal Finish	Ra < 0.4 µm (Ultra-smooth for analytical use)

Primary Types of Capillary Tubing

Exotic Metals LLP offers specialized capillary sections tailored to meet the exacting needs of laboratory and industrial technology:

Instrumentation Capillary Tubes

Used primarily in pressure gauges, thermometers, and remote sensing equipment. These tubes must transfer pressure or thermal signals without loss or delay, requiring perfect internal uniformity and resistance to vibration- induced fatigue.
Medical Grade Capillary Tubes

Specifically designed for surgical instruments, catheters, and diagnostic equipment. Manufactured under the ASTM A632 standard, these tubes undergo high-purity cleaning and passivization to ensure they are biocompatible and free from manufacturing oils or debris.
Chromatographic Capillary Tubes

For analytical chemistry, we provide tubes with ultra-smooth internal bores. This prevents sample "tailing" or contamination, ensuring that chemical separation happens with maximum resolution. These are often supplied in high-grade 316L or Nickel alloys.
Heat Exchanger & Refrigeration Capillary

In the HVAC industry, these act as the expansion device to control the flow of refrigerant. Our tubes are tested for flow-rate consistency to ensure that the cooling cycle operates at peak thermodynamic efficiency.
High-Pressure Coiled Capillary

For offshore oil and gas control lines, we supply long-length coiled capillary tubing. This reduces the number of connections needed, minimizing the potential points of leakage in subsea hydraulic systems.

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Grade Range: Specialized Alloys for Critical Use

We stock and manufacture capillary tubes in a diverse range of materials designed for extreme chemical and thermal resistance:

Stainless Steel: 304, 304L, 316, 316L, 316Ti, 317L, 321, 347, 904L.
Nickel Alloys: Inconel 600, 625, Monel 400, Hastelloy C276, C22.
Specialty Metals: Titanium Grade 2, Grade 5, Tantalum, and Cupro-Nickel.
Duplex Stainless Steel: UNS S31803, S32205 (For high-pressure seawater environments).

Chemical Composition (%)

Our capillary tubes are sourced from high-purity melts to ensure ductility and weldability during micro-fabrication.

Grade	Carbon (C)	Chromium (Cr)	Nickel (Ni)	Molybdenum (Mo)	Others
SS 316L	0.03 Max	16.0–18.0	10.0–14.0	2.0–3.0	Bore Cleaned
Inconel 625	0.10 Max	20.0–23.0	58.0 Min	8.0–10.0	Nb + Ta: 3.15
Titanium Gr 2	0.08 Max	—	—	—	Fe: 0.30 Max
SS 304	0.08 Max	18.0–20.0	8.0–10.5	—	Mn: 2.0

Mechanical Properties

Tested to withstand internal high-pressure surges despite thin wall thicknesses.

Grade	Tensile (MPa)	Yield (MPa)	Elongation (%)	Pressure Rating (Typical)
SS 316L	485 Min	170 Min	40%	Up to 15,000 PSI*
Inconel 625	827 Min	414 Min	30%	Up to 25,000 PSI*
Titanium Gr 2	345 Min	275 Min	20%	High Strength/Weight

Dimensional Precision Chart

A sample of common capillary sizes handled by Exotic Metals LLP.

OD (mm)	ID (mm)	Wall (mm)	Tolerance (mm)	Finish
0.50	0.10	0.20	± 0.005	Polished
1.00	0.50	0.25	± 0.010	Bright Annealed
1.58 (1/16")	0.50	0.54	± 0.010	Electropolished
2.00	1.00	0.50	± 0.015	Cold Drawn
3.18 (1/8")	2.10	0.54	± 0.020	Bright Annealed
6.35 (1/4")	4.35	1.00	± 0.025	Passivated

Delivery & Packaging Information

At Exotic Metals LLP, we treat capillary tubes with the care required for high-precision instruments:

Internal Cleanness: Every tube is bore-cleaned with high-pressure air or nitrogen and capped to prevent any dust or moisture ingress.
Safe Spooling: Coiled capillary tubes are wound on precision plastic or wooden spools to prevent kinking or overlapping.
Surface Guard: Straight lengths are provided in individual plastic sleeves and placed in rigid PVC pipes for structural support.
Export Logistics: For international shipping, PVC-encased tubes are packed in reinforced wooden crates. Coils are boxed with shock-absorbent padding.
Traceability: Every spool or bundle is tagged with the Heat Number, Size, Grade.
Documentation: We supply Mill Test Certificates (MTC) as per EN 10204 3.1, along with Roughness (Ra) reports and PMI testing results.

Frequently Asked Questions (FAQ)

What is the benefit of "Bright Annealing" for capillary tubes?

Bright annealing is a process performed in a controlled atmosphere (usually Hydrogen) that prevents oxidation. This ensures the tube remains shiny and scale-free on both the inside and outside, which is critical for medical and laboratory use.

Can Exotic Metals LLP provide "Electropolished" (EP) capillary tubes?

Yes. Electropolishing removes the microscopic "peaks" on the internal surface, resulting in an ultra-smooth finish that minimizes friction and prevents sample adhesion in analytical chromatography.

Are these tubes suitable for high-pressure hydraulic systems?

Absolutely. Despite their small size, the ratio of wall thickness to diameter in capillary tubes allows them to handle extremely high pressures, often exceeding 20,000 PSI in specialized instrumentation.

Do you offer "Cut-to-Length" services for micro-tubing?

Yes. We use precision laser or burr-free mechanical cutting to provide accurate, clean cut-to-length micro-tubes as per customer specifications.

Capillary Tube