Giulio Natta Nobel Prize winner inventor of polybutene
largest polybutene plant construction moerdijk netherlands
The world's largest polybutene plant at Moerdijk, The Netherlands
largest polybutene plant construction moerdijk netherlands

History | Polybutene Piping Systems (PB-1)

Polybutene-1 (PB-1) piping systems have been in continuous service in Europe and Asia for over 40 years in pressurised hot and cold water installations. Discovered in 1954 by the research team of Nobel Prize winner, Professor Natta; PB-1 is now widely recognised as the state-of-the-art technology for piping systems across a broad range of applications.

Polybutene-1 for piping systems

Professor Guilio Natta, inventor of Polybutene and Nobel Prize winner

Inventing Polybutene-1

The pioneering work of Karl Ziegler and Giulio Natta continues to shape and improve our lives. These two fathers of modern polyolefins changed the world with their discoveries. They were recognised with the Nobel Prize in Chemistry in 1969.

Polybutene-1 (PB-1), was discovered in 1954 by the research team of Professor Natta. It is a thermoplastic polyolefin similar to polyethylene and polypropylene produced through the polymerization of butene-1 using stereospecific catalysts to create a linear, highly isotactic and semi-crystalline polymer. The first industrial production and introduction into flexible pressure piping systems started in Europe in the mid 1960’s. Since its introduction, countless new and innovative PB-1 grades have been introduced for many popular applications.

polypropylene long string molecule polyolefin

PB-1 Milestones

A history of achievement

1954  –  Polybutene-1 (PB-1) was first synthesised by Prof. G. Natta, Italy, one year after polypropylene.
1964  –  First industrial production by Chemische Werke HÜLS, Germany (cap.: ca. 3 kt/a)
1964  –  HÜLS introduced Vestolen BT to the market
1968  –  Mobil Oil developed their own PB-1 process and built a small industrial plant in Taft, Lousiana, USA
1970  –  Early '70s: Mobil Taft plant taken over by Witco Chemical Corporation. – Whitron 4121 introduced
1973  –  HÜLS withdrew Vestolen BT after manufacturing issues in their polymerisation plant
1977  –  Shell Chemicals takes over from Witco and invests in extension of the plant (27 kt)
1998  –  Shell transfers management of PB-1 portfolio to its JV company Montell (Basell predecessor)
2000 – Oct. Montell Polyolefins merged with Targor GmbH and Elenac GmbH to form Basell Polyolefins.
2000 – Dec. Basell approves a new 45 kt PB-1 plant in EU using a new PB process from Basell R&D in Ferrara, IT.
2003 – Basell starts up new 45 kt plant in Moerdijk, The Netherlands (below)
2008 – Moerdijk plant expanded to >60 kt

polybutene plant moerdijk netherlands construction largest

Over 40 years in service

Long-term ISO 9080 tests performed on PB-1 pipes project service lifetimes of 50 years or more for pipes operating with water at 70°C, at 10 bar pressure.

Polybutene-1 has been in continuous service in Europe and Asia for over 40 years in pressurised hot and cold water installations and is widely recognised as the state-of-the-art technology for these systems.

PB-1 pipe applications installed in Europe for underfloor heating (since the early 1970s) and district heating (since the early 1980s) are still operating successfully.

As an example, PB-1 pipes were installed in the Vienna Geothermal Project in 1974, replacing metal pipes which proved unsuitable due to rapid corrosion and operated without problems until 2010 when an expanded system was installed. The Vienna Geothermal project utilises very aggressive geothermal water as the heating medium. The PB-1 piping system ran continuously for 36 years at a constant temperature of 54°C and a pressure of 10 bar – with zero breakdowns.

Long-term ISO 9080 tests performed on Polybutene-1 pipes project service lifetimes of 50 years or more for PB-1 hot water pipes operating with water at 70°C, at 10 bar pressure. ISO 9080 tests are carried out according to international protocols by independent and accredited test agencies such as EXOVA.

polybutene thermal piping electrofusion push-fit fittings piping

In addition, PB-1 pipes are expected to have service lifetimes of 25 years or more when exposed to water containing 2 ppm chlorine at 20° C. PB-1 pipe has been shown to perform for >1,000 hours in chlorine content of 30 ppm at 30 C/6 bar (Test Report-No. PB 1087C, Infraserv Höchst Technik, 2004).

PB-1 piping systems are increasingly specified in well-known locations such as: Royal Albert Hall, Canary Wharf, Imperial War Museum North, Säntis 2000 and many more (see case studies on this website).

Independent test results

Long-term reliability and chlorine resistance
ASTM F2023 test report obtained for PB-1 grade Akoalit PB 4267 confirming more than 50 years extrapolated lifetime at continuous use at 60 °C.  download

Assessment of Polybutylene Plumbing Installation after 18 Years of Service
Presented at Antec 2013 – independent study (onsite evaluation and lab testing) of the condition of a polybutylene (PB) plumbing system in a multi-unit apartment complex.  download

Prepared for the Future

Continuous innovation for Polybutene-1

Since the first successful installations, most of which are still in operation, continuous advances in PB-1 material technology, physical capabilities and production processes, combined with the implementation of stringent international standards protocols, has progressed the performance of PB-1 piping systems to new levels.

LyondellBasell polybutene technology laboratoryIn 2008 the PB-1 plant capacity was expanded from 45 kt to >60 kt. Plans have been made to increase global production further to ensure the supply of PB-1 keeps pace with the accelerating demand, particularly in its largest application, piping systems.

The PBPSA members are world leaders in the innovation and production of fit-for-purpose piping systems for a diverse list of technical applications. All members have ongoing collaboration with engineers, architects and installers of piping systems and offer support for project specifications and research to assist customers and build the practical knowledge base for PB-1 piping systems.

Over the period Polybutene-1 has been on the market, those systems have become increasingly sophisticated with continuous improvements in product capabilities including  jointing techniques, installation and reliability – all providing longer operational lifetimes and increased security for piping installations.


Polybutene-1 is often referred to as Polybutene, PB, PB-1 or Polybutylene.

Polybutene-1 is not sold by PBPSA members for use in pipe applications intended for use in North America, and those parties require their customers or distributors not to sell products made from PB-1 into pipe applications for North America.


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