MATERIALS | TECHNOLOGY WPCs
Capstocks protect dark colours and contain cost
US-based Teknor Apex has developed a range of weatherable capstocks to protect dark-coloured wood-plastic composites (WPCs). The company says that
its Weatherguard WG-9000 materials provide greater durability and scratch- resistance than widely used competing compounds. After 5,000 hours in QUV accelerated weathering tests, the polyolefin-based materials exhibited a colour change of less than 0.5 Delta E for dark brown. Teknor says that they
offer five- to tenfold improvements in elonga- tion and impact strength in comparison with a stand- ard competitors, while sacrificing only 15% in tensile strength. The WG-9015 LG grade
helps reduce cost because it is designed to be used
TPEs Low-hardness TPE aimed at weather seals
PolymaxTPE has developed a low hardness TPE elastomer for weather seals that claims to provide higher tear strength, lower compression set and cost benefits. The grade, D6940, is suited to
weather seal application that require low deformation stress, rubber-like seal recovery, UV resistance and paint stain resistance. With hardness reduced to 40 shore A, D6940 TPE still exhibits 12% higher tear strength than a weather seal grade TPV with 60
www.pipeandprofile.com
shore A while providing low compres- sion set of 14% at 23°C and 36% at 70°C, respectively. “This new TPE achieves our goal of a higher tear strength elastomer with low compression set at hardness levels down to 40 Shore A,” said Tom Castile, VP of sales at PolymaxTPE. The new grade is the latest addition to the company’s weather seal product line, which includes materials with hardness range from Shore A 40 to 90. �
www.polymaxtpe.com
March 2021 | PIPE & PROFILE EXTRUSION 39 PIPE FITTINGS
PVC grade for potable
water pipe Italy-based Benvic has developed a new grade of PVC for making injection-moulded pipe fittings. The IA608 grade had
as a 50% concentrate in a blend with a fractional-melt index polyethylene. Manu- facturers looking for a cost-effective grade that needs no blending with PE can use the WG-9003 LG grade as a 100% capstock. Both grades are sold pre-coloured to meet the customised colour palette of the end customer. “The cost-containment possibilities of these capstocks offer an advan- tage in the competition
between WPCs and wood,” said John Macaluso, industry manager for building and construction in the vinyl division of Teknor Apex. “While great strides are being made to incorpo- rate recycled content in the inner core of deck boards, the quality and durability of the capstock becomes even more important for obtain- ing the performance and aesthetic benefits over traditional wood.” �
www.teknorapex.com
to work at pressures up to 25MPa while ensuring chemical contact compli- ance with potable water – with no emissions. It is made from a high molecu- lar weight PVC resin and has been qualified to the MRS 25 standard. “Creating our IA608
grade was quite a challenge,” said Luca Spetolli, of Benvic’s R&D department. “We needed to meet all the technical and legal constraints attached to the water fitting product – and it had to be moulded in a material that would stand the test of time for over several decades in use.” �
www.benvic.com
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