PUR812 Reinforced Polyurethane Hose — 20 bar

1. Purpose and operating principle

It is made of polyester-based polyurethane with 90 ShA hardness and reinforced with high-strength polyester yarn. The construction combines low weight and flexibility with increased mechanical strength.

According to the manufacturer, the hose is suitable for compressed air, pneumatics, cooling circuits, spray-painting guns, abrasive blasting and other applications requiring abrasion resistance.

2. Technical specifications

Important: pressure and bending-radius values are specified at 23 °C; permissible parameters may change with temperature.

3. Construction features

PUR812 designation breakdown

Construction

• polyester-based polyurethane inner and outer layers;
• high-strength polyester yarn reinforcement;
• 90 ShA polyurethane hardness;
• increased abrasion resistance;
• flexibility at low temperatures;
• resistance to bending and hydrolysis.

Manufacturer marking: RETINATO 8X12 TPU 90 SHA … MADE IN ITALY.

4. Installation recommendations

1. Use fittings designed for a 12 mm external diameter.
2. Cut the hose square and perpendicular to its axis.
3. Clean the outer surface and internal bore before connection.
4. Respect the minimum bending radius of 60 mm at 23 °C.
5. Do not exceed the 20 bar working pressure without manufacturer confirmation.
6. Consider changes in polymer properties at extreme temperatures.
7. Check connection tightness after installation.
8. For painting and abrasive blasting, verify chemical compatibility of the medium with the hose and fittings.

5. Alternatives and comparison

Replacement must be based on pressure, temperature, material, reinforcement, dimensions and bending radius, not only on the 8×12 mm size.

⚠️ Exact catalogue numbers of direct alternatives are not confirmed by the available public sources. Always verify parameters before replacement.

Adjacent Medifly sizes

6. Common mistakes

• selecting the fitting by internal rather than 12 mm external diameter;
• comparing it with non-reinforced PU tubing without considering reinforcement;
• treating 20 bar as a temperature-independent limit;
• bending below the 60 mm radius at 23 °C;
• using fittings that damage the reinforcement;
• ignoring chemical compatibility;
• using damaged hose;
• treating the 60 bar burst pressure as working pressure.

7. Applications

• compressed-air systems;
• industrial pneumatics;
• pneumatic tools;
• cooling circuits;
• spray-painting guns;
• abrasive-blasting equipment;
• technical installations requiring high abrasion and bending resistance.

8. Expert opinion

Vitali Boluchevski, Lead Engineer, Acvatron SRL, 18 years of experience

When selecting a reinforced PU hose, working pressure and burst pressure must be distinguished. For PUR812, the manufacturer specifies 20 bar working pressure and 60 bar burst pressure at 23 °C. Therefore, 60 bar is not a working limit. The 12 mm external diameter is essential for fitting selection. Reinforcement increases mechanical strength, but does not remove the requirements concerning bending radius and temperature.

9. FAQ

What is the size of PUR812?

8 mm internal diameter and 12 mm external diameter.

What is the working pressure?

20 bar at 23 °C.

What is the burst pressure?

60 bar at 23 °C, and it is not the permissible working pressure.

What is the minimum bending radius?

60 mm at 23 °C.

What is the temperature range?

−40…+80 °C.