Tygon® R-3603 Vacuum Tubing has extra-heavy walls that will withstand a full vacuum at room temperature (29.9" [759 mm] of mercury at 73°F [23°C]) and up to 27" [686 mm] of mercury at 140°F [60°C]. Like standard Tygon® Laboratory Tubing, Tygon® Vacuum Tubing resists most inorganic chemicals and can be used in corrosive atmospheres, but prolonged exposure to concentrated acids, chlorinated or aromatic hydrocarbons, ketones or esters should be avoided. Clarity allows monitoring for possible backups which could result in equipment damage. Tygon® Vacuum Tubing will not swell closed if vacuum pump oil should back up into it. Low vapor pressure (low outgassing) makes it suitable for vacuum applications down to 3 x 10-2 mm Hg at 165°F (74°C). Ideal for analytical testing of gases or vapors. Well-suited for use in making manometers. Can be used in the range 20 to 200 degrees F. Makes ideal connections for glass tubing.