materials feature | Polyolefin additives
co-monomer away from the lower fraction and towards the higher fraction – which improves the toughness. The end result is a pipe that is tough enough to be used outdoors and can withstand temperatures up to 80°C says Schramm. The material could be used to replace metal (which
corrodes quickly), PVDF (which is 10 times more expensive) or cross-linked polyethylene (which is harder to install). Potential uses include pipes for cooling power
cables, removing industrial sewage waste or transfer- ring fluid in biomass plants.
Norner has carried out extensive testing of a new PP recipe that can withstand aggressive environments
liquids and solvents with the target of reaching a service life beyond 20 years at elevated temperature. This proprietary technology was developed in a
focused development project, by a team of Norner researchers and laboratory engineers that has exten- sive experience in plastics and additives. The new recipes dramatically extend the service life of PP in aggressive media, say the researchers: even at 70°C, lifetimes of more than 25 years have been demonstrated by accelerated testing. Potential applications include the transportation of
hot water, warm hydrocarbons or alkaline liquids in piping system with PP liners for chemicals. “The proprietary solution developed for PP is
currently in implementation phase in a harsh industrial environment at a chemical plant,” said senior research- er Harry Øysæd.
Two new
Borsafe grades from Borealis exhibit higher resistance to chlorinated
disinfectants.
Tough times Lyondell Basell has developed a new grade of material that claims to combine the high temperature benefits of PE-RT with the toughness of PE100 – allowing the creation of outdoor pipes with greater temperature resistance. Hostalen CRP 100 RT black resin is derived from PE-RT type materials, but has sufficient sag resistance to make large diameter pipes. “We’ve brought PE-RT into the pressure pipe range,”
said Detlef Schramm, marketing asset manager for pipe at the company. The key technology is the process catalyst, which
creates a material with a combination of toughness and high temperature resistance. The material is made in three ‘fractions’, which have low, medium and high molecular weight. This combination already has high temperature resistance. The catalyst forces a butene
18 PIPE & PROFILE EXTRUSION | March/April 2014
www.pipeandprofile.com
PE for water pipe Borealis has developed two new BorSafe products that exhibit higher resistance to chlorinated disinfectants. In some regions, the use of chlorinated disinfectants has been increased in an effort to guarantee the safety of drinking water, says Borealis. Pipes based on BorSafe ME3440-D and BorSafe HE3490-DS-H have shown in trials to last at least three times longer than conventional polyethylene (PE) pipes, it added.
The BorSafe family of PE pressure grades for
infrastructure and pipe systems is based on the company’s Borstar bimodal technology. This gives them robust mechanical properties that enable installation in difficult laying conditions.
With one medium density (MD) PE80 – which is more
adapted to small diameters – and one PE100, the two new grades cover the full range of pipe diameters. “The enhanced properties of these grades have been
developed at the request of our partners in the water distribution industry,” said Anton Wolfsberger, Borealis
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