• Which is the company of Interplast?
• What are the different methods used for cross-linking of Pex?
• How suitable is Como-pex for drinking water?
• What is the guarantee offered for Como-pex pipes?
• How are your pipes tested?
• How do the products differ from German or other European pipes?
• What is the lifespan of Pex pipes?
• Can plain polyethylene pipe be used for cold water supply installations?
• Why should a bar type manifold with check valves be used for plumbing installations?
• Why should a bar type manifold with check valves and 3/4 supply be used for heating installations?
• What is underfloor heating?
• How does it work?
• Don’t the pipes run the risk of leakage?
• Is it possible that the floor reaches too high a temperature?
• What type of flooring can be used for underfloor heating?
• Doesn’t it cost more than other heating systems?
• Can underfloor heating cover spaces with indoor balconies and large openings?
• What is the size and type of boiler / fuel required?




• Which is the company of Interplast?
Interplast is a company that manufactures plastic PEX, PE, PP-R, PVC pipes, PVC, ABS, PP-R and PA plastic fittings and brass fittings. With years of experience in the field, Interplast has established itself among the elite of European manufacturers of plastic pipes for water supply, heating and sewage applications.

• What are the different methods used for cross-linking of Pex?
The differences in the cross-linking methods lie in the means used to cross-link polyethylene [e.g. peroxides: method a, hydrosilicon: method b, radiation (electron bombing): method c]. All methods used aim at rendering the cross-linked polyethylene pipe compliant with the strength requirements specified in European standard EN 12318 and DIN 16892/16893.

• How suitable is Como-pex for drinking water?
Como-pex pipes are non-toxic and totally safe for water and foodstuffs. Toxicological tests carried out in numerous industrially developed countries certify the approval of using cross-linked polyethylene pipes for drinking water. Como-pex pipes have been granted certification of suitability for drinking water by the British Institute WRC, member of NSF International (United States).

• What is the guarantee offered for Como-pex pipes?
Interplast guarantees against damage owing to faulty production for a period of 30 years covered by the insurance company Allianz at the amount of €500,000 per incident and a maximum of €3,000,000 over the course of a year.

• How are your pipes tested?
Interplast is certified to the ISO 9001 standard and implements all the procedures of the Quality Assurance System. The controls our products are subjected to begin with acceptance of raw materials, various materials and packaging materials inspection. Testing of the final products then follows, including diastatic and visual checks, testing under pressure and temperature, recovery after heating, impact tests, degree of cross-linking checks, packaging controls and sampling controls in the storage phase.
Meanwhile the international certification bodies SKZ, AENOR and WRAS check the quality of the pipes at regular intervals (every 6 months), by carrying out random sampling controls from the storehouses and the production lines.

• How do the products differ from German or other European pipes?
There is no difference. The quality of the pipes does not lie in the country, but in the way it is produced. Interplast covers all the requirements of a state-of-the-art production plant with the latest automated equipment which, combined with stringent quality control, guarantees the supreme quality of the final product. Testimony to this is the fact that Como-pex pipes hold the same international certifications as other equally competitive European pipes.

• What is the lifespan of Pex pipes?
Pex pipes are exceptionally resilient to ageing, in conjunction with conditions of high temperature and pressure. They have been designed to endure over 50 years of continuous operation at 95°C and 10 bar pressure. The lifespan diagram confirms the exceptional performance of the pipe when used according to the specifications and recommendations of the manufacturer.

• Can plain polyethylene pipe be used for cold water supply installations?
No. Polyethylene pipes are designed to convey drinking water. They are a cheaper option, but not the recommended solution. The pipes installed inside a building should be capable of meeting high requirements in mechanical strength in order to prevent pressure surge.

• Why should a bar type manifold with check valves be used for plumbing installations?
An advantage of the plumbing installation with distribution panel is the capacity of isolating circuits in case of failure. ON/OFF (mini) valves are cheaper, but after a short period of time they may not be operative due to the build-up of salts. Moreover, their use increases the risk of pressure surge.


• Why should a bar type manifold with check valves and 3/4 supply be used for heating installations?
The bar type manifold with check valves is a prerequisite for heating installations in many EU countries. Interconnections between the manifolds are not allowed because possible damage between the manifolds is difficult to repair.
The Eurocone has been established in EU countries as the permanent supply, as it enables greater quantities of water to flow to the circuits.
The check valves enable perfect micrometric regulation of water supply, which is not possible with ON/OFF valves.

• What is underfloor heating?
Underfloor heating is a reliable and effective heating method which has been used for many years in the countries of Northern and Central Europe, where rather low temperatures are common. Underfloor heating is based on the circulation of warm water through pipes embedded in the floor. Heat is evenly distributed over the area by radiation, offering a comfortable sensation of warmth and cosiness while at the same time saving space and money, as the operating cost is lower. Underfloor heating can be used in both new residences and building renovations or extensions.

• How does it work?
Water from the manifold flows through the pipe circuits. Check valves control the water flow according to the desired temperature set by the thermostat.

• Don’t the pipes run the risk of leakage?
When installation has been carried out properly, in accordance with the design recommendations, there is no risk of pipe leakage. With a lifespan of over 50 years, Como-pex pipes display exceptional strength. All pipes are produced in accordance with the procedures of the ISO 9001 Quality Assurance System and controlled under the most stringent specifications before being distributed to the market. In very rare incidences of leakage the pipes can be repaired with total safety and the connection is 100% watertight.

• Is it possible that the floor reaches too high a temperature?
No. A well-designed underfoor heating project will provide comfortable heat. The floor temperature can reach 29°C. At this temperature the floor is warm and comfortable, even for walking barefoot.

• What type of flooring can be used for underfloor heating?
All types of flooring are suitable for underfloor heating, so long as the installation design makes the necessary allowances and incorporates all the necessary measures for safe and smooth operation.

• Doesn’t it cost more than other heating systems?
Generally speaking underfloor heating is indeed more expensive than heating with radiators, but it offers savings in bills. The investment is quickly returned due to the lower cost for operation and maintenance. Finally, apart from the ideal comfort, warmth and cosiness offered by the system, underfloor heating adds value to a residence.

• Can underfloor heating cover spaces with indoor balconies and large openings?
Precisely because heat is conveyed from the surface of the floor and not from the height of the radiators in a conventional system (1.20m) or an air conditioning unit (2.50m) we can achieve the desired temperatures even in spaces with a high ceiling, as heating is provided to the effective height of the space (approx. 2.10m) and not the ceiling of the building (as is the case with conventional systems).
In addition, it covers the needs of building with large openings and no available external walls for the installation of radiators. Underfloor heating is thus an invaluable tool for contemporary architectural design.

• What is the size and type of boiler / fuel required?
In general terms any kind of boiler and fuel can be used as a heat source. Boilers are regular-sized according to the thermal load required, the thermal losses calculated and taking other needs into consideration, such as the supply of hot water for domestic purposes.