The rated working pressure for TYGON® tubing is determined using a safety factor of 1:5 against burst pressure (1:4 for braid reinforced hoses – I. B.) at room temperature, 23°C. As the temperature increases, the working pressure can decrease. These should be taken into account by applying the data in the tables for the tubing type or (as approximate indication) according to the general data for the material.
Vacuum and TYGON®tubing vacuum applications
The maximum working vacuum at room temperature, at +23°C, in mm Hg (millimetres of mercury, 760 mm Hg = 1 bar) is basically given for most TYGON® tubing. The working vacuum is determined by a static vacuum test: 610 mm long sample, vacuum applied for 10 minutes. For higher temperatures, the drop in the working vacuum must be taken into account. And finally, VACUUM version or application-tested tubing with the thickest wall should be used for permanent, full-vacuum applications.
As TYGON® tubing is made of special materials selected for each tubing type, its chemical resistance may differ from standard materials of the respective type. Therefore, to determine the chemical resistance of particular tubing, a detailed TYGON® tubing resistance chart available on the website must be used. We strongly recommend to contact Tubes International to make the right choice of tubing for your application.
The physical properties of TYGON® tubing are determined at room temperature, 23°C. As a general rule, the tubing becomes more rigid and stiffer when the ambient temperature decreases, and more flexible but weaker when the temperature rises.
In addition to the working pressure, flexible tubing has a number of practical mechanical properties such as minimum bend radius, flexibility, bending moment, softness, stretchability, etc., which are important for selecting the right tubing for the application. However, these properties are difficult to parameterise and compare for the very tubing. Instead, there is precise data on the material properties of each TYGON® tubing type, the most important of which (hardness and minimum bend radius) are given in the catalogue description. It is recommended that selection is based on direct assessment of the mechanical properties of a tubing sample in consultation with Tubes International.