What pressure and temperature can withstand the polypropylene pipe, a temperature table

Knowing what materials to use for heating and insulation in your home is essential for efficiency and safety. Polypropylene pipe is one such material that is frequently utilized in plumbing systems. Many homeowners choose this adaptable piping solution because of its versatility and reputation for strength and flexibility. To guarantee that polypropylene pipes function at their best and endure for many years, it is crucial to understand their limitations with regard to pressure and temperature.

Although polypropylene pipes can withstand a variety of temperatures and pressures, it’s crucial to recognize their limitations in order to avoid damage and potential risks. Polypropylene pipe pressure and temperature ratings can change based on wall thickness, diameter, and manufacturer specifications, among other things. For accurate information, consult a temperature table tailored to the particular type of polypropylene pipe you’re using.

Temperature has a big impact on polypropylene pipes’ functionality and durability. Extreme temperature exposure can cause brittleness, deformation, or even failure in these pipes. Knowing the temperature ranges at which polypropylene pipes can be used will help you select the best material for your plumbing and heating requirements and will also help you install the right insulation to shield the pipes from temperature changes outside.

You can make sure you’re working within safe bounds and extending the life of your plumbing system by consulting a temperature table for polypropylene pipes. The maximum operating temperature that is normally permitted for a given pipe size and pressure rating is shown in this table. By adhering to these recommendations, problems like leaks, bursts, and other types of damage that may arise from surpassing the suggested temperature limits can be avoided.

In conclusion, knowing the capabilities of polypropylene pipes is crucial for maintaining a safe and effective plumbing system when it comes to the insulation and heating of your home. To prolong the life of your pipes and make sure you’re operating within safe limits, consult a temperature table designed specifically for polypropylene pipes. Always keep in mind elements like insulation, temperature, and pressure to protect your plumbing system and have a cozy home.

Polypropylene Pipe Temperature Range
Low Pressure Below 80°C (176°F)
Medium Pressure Up to 90°C (194°F)
High Pressure Up to 100°C (212°F)

Properties of polypropylene

Polypropylene is a white powder that is a synthetic polymer that can be melted or pressed to create a profile. This kind of plastic is the strongest, steadiest, and least prone to rust.

Polypropylene’s primary physical characteristics include resistance to high temperatures, wear resistance, durability, and dependability. Since chemicals, salts, and alkaline solutions do not affect it, the water quality data for this pipeline are not too bad.

  • weigh less than steel;
  • do not distinguish substances harmful to health – suitable for installation in household premises;
  • The inner surface is smooth, which does not allow the scale to be postponed;
  • The heat conductivity level is low;
  • good sound insulation;
  • high electrical insulation;
  • Heat capacity of 2.0 kJ/(kg.° C);
  • permissible temperature level -15 -+120;
  • density value – 0.92 kg/cm³.

This pair temperature, +175 degrees, is the melting point of polypropylene, which softens at +140 degrees.

Because of this feature, a polypropylene pipeline that is reinforced can be used for either hot or cold water supply. A certain amount of coolant heating is maintained in the aisles of +95, but it cannot be used as a steam pipe.

The assembly of the water line from these products is appropriate, and the process of connecting the pipeline’s components is fairly straightforward because polypropylene becomes soft when heated and returns to its original hardness after cooling. It only needs to be docked and heated; couplings can be used to connect it.

Polypropylene’s primary flaw is its malleability. The product softens and becomes easily bendable when heated. However, a bend of this kind results in a much smaller inner diameter and a lower bandwidth level.

Furthermore, this material is light-sensitive; as a result, the product may burn out, crack, or lose its shine. Several ingredients are added to polypropylene’s composition to prevent this.

It is important to remember that polypropylene breaks down between minus 5 and 15 degrees, and that it cannot withstand frost. Rubber additives made of ethylene or ethylpropylene also eliminate this material’s drawback.

For polypropylene products, the standard pressure indicator is 30 kg per 1 cm2. But you shouldn’t weigh more than 10 kg, per manufacturer recommendations.

Types of polypropylene pipes

There are two primary categories of polypropylene pipes: non-targeted and reinforced. They are further separated based on the manufacturing material and layout. A blue stripe indicates a cold water supply, while a red stripe indicates a hot water supply for the product.

All products made of polypropylene have the letters PN on them. The cost is determined by the number that appears next to the abbreviation PN; the larger the number, the higher the price.

These species are less expensive, more flexible, and plastic. Because there are no obstructions in the connection’s fitting sections, conventional profiles are simple to lay.

Products made of polypropylene are marked with the following information, which shows the maximum temperature that is acceptable:

  1. PN 10 – permissible temperature + 45 (for sexual heating) and + 20 (for water supply), pressure 1 MPa. Wall thickness – 10 mm, diameter – from 20 to 110 mm.
  2. PN 16 – permitted pressure 1.6 MPa, temperature value + 60. Wall thickness from 3.4 mm.
  3. PN 20 – a pressure of 2 MPa is acceptable, at a temperature of + 80 degrees. Wall thickness 16 – 18.4 mm.

When used for cold water supply, abandoned highways can have an operational life of up to 50 years and 30 days if heated coolant flows through them.


The addition of a second layer of fiberglass or aluminum is called reinforcement. The product is stronger and has a longer lifespan thanks to this material; the profile can last up to 50 years even when there is hot coolant present.

Furthermore, reinforcement eliminates the possibility of a linear expansion with an additional main gap when using this pipeline with water heated to + 120 degrees.

High-pressure hot water supply is the goal of models with reinforcement. This kind:

  • more resistant to chemicals;
  • The expansion coefficient is 5 times lower than the usual profile;
  • ability to withstand high temperature and maximum loads.

Depending on the reinforcing material, profiles are:

  1. With an aluminum layer – these models have a high level of working pressure, so they are suitable for central heating and hot water. The aluminum layer reduces the degree of temperature deformations and oxygen diffusion.

Installing the aluminum reinforced profile is necessary because we won’t permit the aluminum layer to come into contact with water. As a result, several centimeters of reinforcing coating must be removed from the docking locations.

  1. Reinforced with fiberglass – have a low level of expansion. Fiberglass fiber reduces deformation when heated. In comparison with aluminum models, such products have a lower pressure indicator when heated, so they are less in demand.

Because this species doesn’t require stripping, installation is easier. There is no material stratification; instead, molten polyethylene connects the fibers to one another.

  1. Pipes reinforced with basalt fiber. This species has a lot of advantages, compared not only with any reinforced models, but also with plastic and metal profiles. It is easier in installation, in comparison with aluminum coating, since it is not necessary to clean. Basalt products are easily connected to any kind of polypropylene fittings.

PN 20 and PN 25 reinforced pipes are identified. They can tolerate pressures of up to 2.5 mPa and temperatures of + 95.

However, not every reinforced product can tolerate higher heating temperatures. For instance, polypropylene pipe reinforced with fiberglass can withstand temperatures as high as +120 without breaking, but aluminum cannot (at least not for an extended period of time).


Apart from the PN marking, which denotes pressure and temperature, there are: all plastic pipes

  • The word "pipe";
  • the name of the material in abbreviated form;
  • SDR – the value of the external size to the thickness of the walls;
  • external profile size;
  • Operational class;
  • the outer pressure of the working pressure;
  • Standart room.

SDR 11–20´ Pip PP–R 1.9 Class 1/1.0 MPa Whereas: GOST R 52134-2003

  • Polypropylene profile – SOPR 11 SOPRIMER;
  • external diameter 20 mm;
  • wall thickness 1.9;
  • class 1;
  • Permissible pressure 1 MPa.

Profiles in structure are separated into:

  • S – single -layer;
  • M – multi -layer;
  • Ti – with a heat -insulating layer;
  • PP – standard;
  • PP-RP-withstanding high pressure.

Based on the kind of content, there are:

  • PPB – they have high strength, their purpose – sexual heating with hot coolant;
  • PH – have an enlarged internal diameter, mounted on ventilation systems and cold water;
  • PPR is a universal type, withstanding elevated temperatures.

They are split up in the class into:

  • Class 1 – up to +60 C, intended for water supply;
  • 2 – up to +70 (pipelines);
  • 3 – + 60 (warm floors);
  • 4 – +70 C, used in heating;
  • 5 – + 90 (heating);
  • Class XB – for cold water supply.

Each manufacturer marks their products with a trademark.

Temperature table

We provided a table of the temperatures that polypropylene pipes can tolerate for clarity’s sake.

View Purpose Maximum temperature level Working pressure (atm)
Pn 10 Cold water supply +40 p

Features of use in the heating system

Considering everything mentioned above, polypropylene species that have a maximum temperature of +95 are excellent choices for the heating arrangement.

Maintaining comfort and energy efficiency in your home requires proper heating and insulation. The pipes that distribute hot water throughout the house are an essential part of the heating system in your home. Because of their flexibility and longevity, polypropylene pipes are a popular option, but it’s crucial to be aware of their temperature and pressure limitations.

Polypropylene pipes are appropriate for a variety of heating systems because they can tolerate a wide range of temperatures and pressures. It is imperative to refer to a temperature table that is particular to the kind and quality of polypropylene that is utilized in your pipes. The maximum temperature that the pipes can withstand without losing their integrity is indicated in this table.

It’s important to take into account variables like the highest temperature your system will reach, the pressure it will operate under, and any potential variations in these conditions when choosing polypropylene pipes for your home heating system. Your heating system will last longer and be safer if you select pipes with the right pressure and temperature ratings.

It’s also critical to perform routine maintenance and inspections on your polypropylene pipes in order to identify any early indications of wear or damage. Your heating system’s temperature and pressure can be monitored to help spot possible problems before they get worse and avoid expensive repairs or replacements.

In summary, polypropylene pipes provide flexibility and durability, making them a dependable option for home heating systems. You can guarantee the safe and effective operation of your heating system for many years to come by being aware of the pressure and temperature limitations of these pipes and by following recommended maintenance procedures.

This article delves into the world of polypropylene pipes and covers heating and insulation for your home. Because these pipes are reasonably priced and long-lasting, plumbing systems frequently use them. However, what is their maximum capacity for heat and pressure? Well, that depends. The typical tolerance for pressure in polypropylene pipes is limited, and temperature affects how resistant they are to heat. We’ve included a temperature table with the safe operating temperatures for polypropylene pipes so you can see things more clearly. By being aware of these limitations, you can ensure that the plumbing system in your house continues to be secure and effective for many years to come.

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Michael Kuznetsov

I love to create beauty and comfort with my own hands. In my articles I share tips on warming the house and repairing with my own hands.

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