Fused Silica Adapters - Two Piece

two piece fused silica adapter

The FSR adapter is the only adapter recommended for use in valves. It consists of a liner which slides over the fused silica tubing and a ferrule which makes up on the liner. The liner has an enlarged diameter at one end which is captured by the nut, so the liner and the tube within it are removed as the nut is unscrewed from the valve.

Two piece fused silica adapters are made from Valcon polyimide for use up to 350°C. Valcon polyimide is a unique graphite-reinforced composite, specially prepared to maximize mechanical stability at high temperatures. Small blocks are subjected to extreme loads by a process known as hot isostatic pressing, with individual ferrules subsequently machined from these blocks. The result of this two-step process is a fused silica adapter with high temperature stability which far exceeds that of parts produced by conventional molding.


  • The determining factor in selecting the adapter size is the fused silica tubing's outer diameter, or OD.
  • 1/16" FSR adapters include a special counterbored 1/16" nut.

1/16" Valcon polyimide two piece FS adapters

Description FS tubing OD Product No.
Complete assembly
(Package of 5)
0.20 ≤ 0.40 mm FS1R.4-5
0.40 ≤ 0.50 mm FS1R.5-5
0.50 ≤ 0.80 mm FS1R.8-5
Replacement liners
(Package of 5)
0.20 ≤ 0.40 mm FS1L.4-5
0.40 ≤ 0.50 mm FS1L.5-5
0.50 ≤ 0.80 mm FS1L.8-5

Also available in other sizes on special order.




  • PEEK
    Good chemical resistance and mechanical properties at slightly elevated temperatures
  • Polyimide, Valcon
    High temp, graphite reinforced