CAUTION: Great care should be taken when using capillary tubing with internally applied pressure. Although capillary is very robust, a small particle or a minute chemical etching can create an internal stress crack or flaw. The combination of pressure and heat should be given special consideration. If handling, environmental, and/or chemical exposure after manufacturing has changed the internal surface or generated flaws, the added stress of high internal pressure can result in failure. When there is possible chance for abnormally high internal pressure, we suggest testing a sample of the actual material that will be used to obtain some confidence in its durability under increased pressures. Always perform safe laboratory practices when working with any pressurized devices.

NOTE:  The material is proof tested in production to verify strength and quality (see Bending Stress in Capillary); it is important not to interpret proof testing as a measure of internal pressure capability.

 

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