Capillary Tubing for Gas Chromatography

Biotaq Capillary offers a broad array of standard and custom-made bare fused silica capillary tubing at unbeatable prices.  As the largest manufacturer of flexible fused silica capillary in China and with customers around the world, our products are used in a wide range of applications including capillary electrophoresis, gas chromatography (GC), DNA sequencing analysis, liquid chromatography (LC), LC-MS, etc. Our product line for GC contains both standard capillary for operating temperature of up to 350°C and high temperature capillary tubing for operating temperature of up to 400°C.

Our capillary products are made from the highest quality synthetic fused silica. The inner wall of the capillary is treated with ultra-pure gas to ensure its inertness. The capillary is fabricated using a sophisticated draw tower with an intelligent software system to guarantee its geometric precision. The specially designed polymer mixtures are applied to the capillary to ensure its superior mechanical strength, excellent dimensional evenness, and high temperature endurance. The tightly-controlled manufacturing process and strict QC procedures ensure that the capillary products we produce are of the highest quality.

Product features

  • Synthetic high purity fused silica
  • 100% proof tested for strength at 100 kpsi
  • Operating temperature up to 400°C
  • Excellent flexibility    
  • Excellent chemical durability and surface inertness
  • Dimensionally stable over long lengths
  • Easily cut or cleaved 
  • To learn more, see product sheet

Quotes from Our Customers

"We have used several hundred thousand meters of the high quality, high performance flexible fused silica capillary tubing from Biotaq to make our GC columns. The product has demonstrated high strength, superior thermal stability, excellent durability, strong chemical resistance at high temperature, and dimensional evenness over long lengths. When studied side by side, Biotaq’s BT capillary tubing is of equivalent performance to the top global brands and is top of the line among all producers in the world."

Dr. De Wei Kong, Vice President
Analytical Technology – The Largest GC Column Supplier in China

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Specifications and Prices
Catalog Number BT250370 BT320450 BT530680 BT-G-250370 BT-G-320450 BT-G-530680
Temperature of Operation
Standard (up to 350°C)
High (up to 400°C)
Inner Diameter (μm)
250±6
320±6
530±8
250±6
320±6
530±8
Outer Diameter (μm)
370±10
450±10
680±15
370±10
450±10
680±15
Length Price
10m
$40
$40
$45
$40
$40
$45
25m
$85
$85
$95
$85
$85
$95
50m
$135
$135
$150
$135
$135
$150
50m+

Shipping and handling - U.S. Domestic (FedEx) $35, International (FedEx) $95
Sales tax will be applied to orders shipping to Maryland

Instructions for using the payment button:

  1. Choose the Catalog Number from the first drop down menu.
  2. Choose the length from the second drop down menu.
  3. Click "Add to Cart". A new page will open connecting you directly to PayPal.
  4. The quantity of your order can be adjusted on the PayPal page.
  5. You may pay by credit card or your PayPal account.

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