Air Load Tubes

Coldwater offers suction roll air loading tubes made from either blue Vincon or Neoprene tubing, and fittings in 316 stainless steel.

We stock tubing in all common metric and U.S. diameters, and can provide fully assembled tube sets or bulk spools for customer assembly. Fittings, plugs, ferrules, and stems from all major machine builders are in stock and also available in bulk. We also stock spaghetti tubes, closed cell foam side seals and protective rubber cushions for the bottom of the seal holder.

Crimpers, dies, and components for assembling customers’ own tubes are also available.

Leak Prevention

Excessive load tube pressure will cause over-expansion of the tube in the relief notches on the bottom of each end of the seal. This is a common cause of tube failure. Coldwater shrink tubes eliminate this problem by preventing tube expansion into this open area. Assembled sets are provided with our unique “Leak Prevention” shrink tube over the connection between the tube and ferrules.

Blue Vincon Air Load Tubing/Industrial Grade PVC Tubing–Formulation C-50C-D5

Typical Physical Properties

Property ASTM Method Value or Rating
Durometer Hardness (Shore A), 15s D2240 57
Tensile Strength, psi (MPa) D412 1600 (11.0)
Ultimate Elongation, % D412 410
Tensile Stress @ 100% Elongation,  psi (Mpa) D412 540 (3.7)
Tear Resistance, lb-f/inch (kN/m) D1004 130 (22.7)
Compression Set Constant Deflection, % @ 158°F (70°C) for 22 hours D395 Method B 65
Specific Gravity D792 1.32
Water Absorption, % 24 hrs at 73°F (23°C) D570 0.07
Maximum Recommended Operating Temperature °F (°C) 165 (74)
Toxicity Non-Toxic
Color Blue
Unless otherwise noted, all tests were conducted at room temperature (73°F). Values shown were determined on 0.075″ thick extruded strip or 0.075″ thick molded ASTM plaques or molded ASTM durometer buttons.


Acids Bases Salts Alcohols Ketones
conc. med. weak conc. med. weak
 Aliphatic Hydrocarbons          Aromatic Hydrocarbons     Halogenated Hydrocarbons
               U                                                       U                                                   U

Product Characteristics

Opacity Opaque
FDA Approved for Food Contact No
NSF 51 Standard No
USP Class VI No


Black Neoprene Air Load Tubing

Unaged Physical Properties ASTM Method Requirements Test Pass/Fail
Tensile Strength, Mpa (PSI) D412 1450 1644 Pass
Elongation at Break 250 300 Pass
Hardness, Type A, +/-5 D2240 50 52 Pass
Oven Aged Physical Properties ASTM Method Requirements Test Pass/Fail
70 Hours @ 212°F (100°C) D573
Tensile Strength, % Change Max. -13 +2.0 Pass
Elongation, % Cange Max. -40 -15.0 Pass
Hardness, Type A, Pt. Change Max. +15 +6 Pass
Compression Set Max % ASTM Method Requirements Test Pass/Fail
22 Hours @ 212°F (100°C) 35% 32.60 Pass
Low Temperature ASTM Method Requirements Test Pass/Fail
Max. C, Determine Actual Temp. -55°C 5 of 5 Pass

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