Calibrated Coextruded Tube Medifly PUSAL1114 PU-ALLOY™ SOFT, Ø 11×14 mm, 95 ShA

1. Purpose and Operating Principle

This construction solves a problem typical of standard polyurethane in contact with oils: the inner copolyester layer does not swell or soften on contact with mineral and vegetable oils, lubricants, and fats, while the outer TPU layer retains the tube’s mechanical strength and flexibility. An 11 mm inner diameter with a calibrated 14 mm outer diameter provides high throughput for viscous oily media.

2. Technical Specifications

⚠️ Unconfirmed parameters:

• Exact weight of a 100 m reel (approx. ~4.45 kg — confirm when calculating logistics).
• Availability of colors other than translucent blue (Sky Blue) and blue.

3. Design Features

Part number breakdown:

Design solutions:

• Coextrusion (Coex) — the inner copolyester layer blocks the penetration of vegetable oils, fats, and aggressive chemicals, protecting the polyurethane structure from the inside.
• Enhanced flexibility (95 ShA) — the Soft variant is softer than standard 98 ShA polyurethane, simplifying routing in confined spaces.
• The outer TPU layer provides resistance to abrasion, kinking, ozone, and weathering.

4. Installation Recommendations

• Cut the tube strictly at a 90° angle using a dedicated guillotine tube cutter — an ordinary knife or pliers will crush the 14 mm wall and compromise the seal in a collet fitting.
• For feeding oils under constant pressure, compression fittings with a union nut (11×14 mm) are recommended; for quick installation, 14 mm push-in collet fittings with a metal clamp.
• Maintain a minimum bend radius of at least 35 mm — sharper kinks damage the inner copolyester layer.
• When conveying heated oils (above +30 °C), reduce the working pressure per the temperature correction — the rated 6 bar applies at +23 °C.
• Do not allow the tube end to be stretched over a barbed fitting by more than ~15% — the same principle as with standard PE/PU: excessive expansion deforms the inner layer and creates a leak risk.

5. Alternatives and Comparison

Check the exact inner diameter match before substituting — most single-layer competitor equivalents are made with a 10 mm, not 11 mm, inner diameter, and lack an oil-barrier inner layer.

Comparison within the Medifly range:

6. Common Mistakes

• Using a standard polyurethane hose instead of PU-ALLOY™ SOFT for vegetable oil — standard PU swells and softens on continuous contact with oils.
• Using barbed fittings with excessive interference fit — stretching the tube end by more than ~15% deforms the inner layer and creates a leak risk.
• Cutting with an ordinary knife or pliers instead of a guillotine-type cutter — crushes the wall and compromises the seal in the fitting.
• Exceeding the +65 °C temperature limit — leads to material softening and reduced strength.

7. Application

Food industry (conveying sunflower, olive, and other vegetable oils, animal fats, liquid sauces, and emulsions), agricultural machinery (pneumatic and hydraulic tools for orchard pruning and harvesting, lubrication lines), industrial equipment (conveying cutting fluids and lubricants in machine tools), pneumatic systems with compressed air carrying oil mist from lubricators.

8. Expert Opinion

“The Medifly PU-ALLOY™ SOFT PUSAL1114 series with an 11 mm inner diameter is a professional solution for applications where standard polyurethane loses its properties on contact with oils. Thanks to the coextruded copolyester inner layer, the tube doesn’t swell when pumping sunflower or technical oil, retaining its 95 ShA elasticity. It’s one of the best options for oil lines and food production in Moldova,” notes Vitali Boluchevski, Lead Engineer, Acvatron SRL, 18 years of experience.

9. FAQ

Can PUSAL1114 be used for sunflower oil? Yes, the tube is specifically designed for fats, oils, and emulsions — the inner copolyester layer is inert to vegetable and mineral oils.

Is the tube compatible with 14 mm push-in collet fittings? Yes, the calibrated 14.0 mm outer diameter ensures a secure fit in the collets of all major European brands.

What’s the main difference between the PUSAL series and standard polyurethane? PUSAL is made using two-layer coextrusion: the inner copolyester layer protects against oils and chemicals, while the outer TPU provides mechanical strength and flexibility.

What’s the tube’s maximum working pressure? At room temperature (+23 °C), working pressure is 6 bar, and burst pressure is 24 bar.