What is polyurethane?

Polyurethane, commonly known as ”PUR”, is generated by mixing two liquids, polyol and isocyanate. The carefully calculated reaction process initiated by mixing the two liquids is called foaming. The result of this process is a viscous, foamy casting material which quickly transforms into PUR in a solid form. The PUR can be produced with various levels of rigidity and density.

PIR block foam (polyisocyanurate) is a modified PUR system with a relatively low flammability and high resistance to increased temperatures. Dan-iso PIR, Class 1 block foam complies with ”Class 1” Fire Test (British Standard 476: Part 7: 1997).

Casting insulation shells
When the liquids are injected into special moulds, it is possible to cast insulation shells. Dan-iso’s main product is insulation shells for pipe joints in the district heating and industrial sectors. In addition to ordinary insulation shells, Dan-iso shells are available in a number of different shapes and types, e.g. shells with a lining made of mineral wool or flexible foam, or shells with a facing of e.g. folio or napa leather. Our competence lies in knowing the full scope of variations, enabling us to make the optimum use of the material. Dan-iso has more than 30 years of experience with the casting of insulation shells.
Rigid PUR is one of the most efficient insulation materials. The insulating value is more than 30% better than that of rock wool, mineral wool and EPS insulation.

What are PUR shells used for?
In addition to insulation of district heating pipes, PUR is applied for technical insulation, insulation in the refrigeration industry and the oil/offshore sector as well as for industrial insulation.

Polyurethane Properties:

Insulation capacity
High strength/weight ratio
Torsional stability
Chemical resistance


Mandatory Training:

On 4 August 2020, the European Union published the REACH Restriction on diisocyanates which will introduce mandatory training requirements for workers using diisocyanates from 24 August 2023.

The EU REACH Restriction process for diisocyanates started in 2016 when the German Federal Institute for Occupational Safety and Health (BAuA) submitted a proposal to the European Chemicals Agency (ECHA). ECHA delivered its opinion to the European Commission in 2018 on the measure, finding that mandatory training is the most appropriate, protective and effective EU-wide risk management measure to reduce occupational asthma cases among workers who deal with diisocyanates.

The Industry agrees with ECHA’s assessment that the Restriction is the most effective and efficient measure to enhance occupational health and safety. Jörg Palmersheim, Secretary General for ISOPA/ALIPA, said: “The Restriction is the culmination of years of constructive cooperation between the diisocyanates value-chains and the European REACH Authorities. It raises the bar for how we can work together to enhance protection of workers and ensure the use of best practices across the EU in terms of health and safety. We now look forward to ensure the successful implementation of the Restriction together with the downstream users and Member States.”

The Restriction establishes requirements for the use and placing on the market of diisocyanates as substances on their own, as a constituent in other substances or in mixtures for industrial and professional use(s) in concentrations above 0,1% by weight. 

The new REACH Restriction has brought new requirements for companies placing diisocyanates on the market and their users in Europe. As part of the provisions, all industrial and professional users will need to get trained for the safe use of diisocyanates. The legal text foresees three different levels of training (general, intermediate and advanced) depending on the tasks done by the employee. In order to train the workforce across the European Union, ISOPA/ALIPA have launched a digital platform.

On www.safeusediisocyanates.eu, users can find all the necessary material to be trained according to the REACH requirements. The platform offers around 30 training paths based on PU applications, including three videos on sensitization, personal protective equipment and first aid. The content will be available in all the official languages of EU Member States by the end of 2022. There are different options to complete the training. Users can register online for self-eLearning, or they can register to classroom trainings either online or in person. For larger organizations, there is the option to create an administrative account and register multiple employees easily and centralize all the administrative tasks. Finally, there is also an option to register as a trainer to organize training sessions themselves.

Pipe insulation

Read more about PUR and PIR pipe insulation