materials feature | Polyolefins


TPEs for pipe Hexpol TPE has developed its Dryflex PS range of TPE compounds for seals and pipe joints used in waste water applications. The grades meet the requirements of EN 681-2:2000, the European Standard EN 681-2, Type WT, says the company. The standard specifies requirements for TPE materials


used for moulded seals used in joints of: thermoplastic piping systems for non-pressure waste water discharge (intermittent flow up to 95°C) inside buildings; for non-pressure underground drainage and sewerage (continuous flow up to 45°C and intermittent flow up to 95°C); and, for thermoplastic rainwater systems.


Aquatherm PP-R red pipe was used in a fire sprinkler system in the Kö-Bogen shopping complex in Düsseldorf, Germany


Bimodal boost Sabic launched several new families of resins at K2016, made using the Nexlene technology that it co-owns with SK Global. The company says the bimodal technology produces resins with higher processability and higher impact strength. One of the families, Supeer, is an LLDPE used mainly


for multi-layer packaging – in applications such as pouches and stretch hood film. However, Sabic’s Supeer 8200RT grade has been developed for hot and cold water pipe applications. “Metallocene grades are usually quite hard to


process – but the bimodal process overcomes that,” said Rolf Scherrenberg, director of market development and technical support at Sabic. He said that bimodality also helps to give the Supeer pipe grade higher stress crack resistance (SCR).


Fire safety BVFA, the German Association of Technical Fire Protection, has awarded its ‘Sprinkler protected’ quality seal to the Kö-Bogen shopping complex in Düsseldorf, Germany.


Hexpol TPE’s Dryflex PS is used for seals and pipe joints in waste water applications


The building uses an Aquatherm red pipe system, which is built into the ceiling on three storeys of the Kö-Bogen. Around 3,400 sprinkler connections and 6,500m of pipe – including the moulded components – were built into 25 building sections. The building time included the winter months, so pressure testing of the pipes involved a water-glycol mix to prevent frost damage. All the necessary pipes including supply pipes were


pre-fabricated according to designs in Aquatherm manifold construction, and tested for tightness in Attendorn before a welding report was compiled. The products were then supplied to Düsseldorf and built in. Aquatherm red pipe is aimed specifically at fire


sprinkler systems, and is made from random polypro- pylene (PP-R).


24 PIPE & PROFILE EXTRUSION | March 2017 www.pipeandprofile.com


Adding stability Additives are becoming an increasingly important factor for polyolefins – especially when they are recycled. Baerlocher has developed two new technologies for stabilising recycled polyolefins. The main technology, developed by Baerlocher USA, is the company’s Baeropol RST (resin stabilisation technology). This is an anti-oxidant technology that allows the use of second- ary anti-oxidant phosphites to be eliminated or reduced – while maintaining resin properties through multiple heat histories. The company has incorporated the RST technology


into a line of preformulated One-Packs designed to provide economical resin stabilisation for the polyethyl- ene and polypropylene recycling industries. The new additive helps to raise melt stability, as well


as protecting against long-term ageing and colour fading. “We discovered it when we were working with


upstream customers,” said Gregory Andersen, business manager for Baeropol. He said that phosphites traditionally have solubility


problems – and can precipitate at loadings above 800ppm.


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