MATERIALS | HIGH TEMPERATURE PLASTICS
Right: PPAs chalk up more success in connectors
at BASF, said the product “is the ideal solution for parts that require high, constant stiffness and strength over a broad temperature range in combination with resistance to heat and humidity as well as optional flame-retardant (FR) properties.” According to BASF, the latest PPA shows
improved impact strength on a par with standard PA66 and a lower water uptake than standard aliphatic polyamides, resulting in high dimensional stability. Its high melting point (310°C) and heat deflection temperature of over 280°C (HDT-A) make it suitable for lead-free soldering without part deformation. Flowability is “significantly higher than that of other high-temperature polyamides without compromising flexibility or toughness”. Within the T2000 family, BASF has developed a
special range of FR grades reinforced with 30% to 40% glass fibres and with UL 94 V-0 rating available for all colours. In addition, there are several grades with reinforcement levels ranging from 30% to 50% glass fibres and improved impact resistance, available both as uncoloured and laser-markable black. Different heat stabilisers are available. Also working on PPAs is RadiciGroup High
Performance Polymers, which has developed several grades under the Radilon Aestus brand. Once again, the materials are less affected by humidity than standard polyamides; they also have higher resist- ance to hydrolysis, as well of course as higher melting temperatures. The Radilon Aestus T range comple- ments other products from RadiciGroup High Performance Polymers based on PA 6 and 66. The company’s marketing emphasis appears
Below:Kitchen tools that need to resist high temperatures are being made in PPA
rather different from BASF’s. Global Marketing Manager Erico Spini cites applications for Radilon Aestus T1 RV 300 FC and Radilon Aestus T1 RV 400 FC in food-contact products suitable for use at temperatures of up to 270°C. Products aimed at hot water plumbing include Radilon Aestus T1 RV 300 RKC, T1 RV 400 RKC, and T1 RV 450 RKC, while Aestus T1 RV330RG is suitable for components in
contact with automotive engine coolants.
Expanding options in PA9T Last year,Kuraray expanded its Genestar PA9T E&E grade portfolio with flame-retardant (V-0) halogen- free 30% glass reinforced grades (see Injection World September 2018). This year, it is highlighting the fact that it is removing the last barriers for use of the grades in E&E applications, by finalising the necessary UL registrations, such as RTI values. “Since Genestar PA9T grades are unique in combining a good processability with JDEC MSL 1 blister resistance, CTI [Comparative Tracking Index] over 600 V and a high weld-line strength, these benefits can finally be experienced by design engineers in Europe,” says Wim Dennison, Market Development Specialist with Eval Europe, Kuraray’s subsidiary in Belgium.
Dennison also points to a new “electro-friendly” 30% glass reinforced grade, G1300A-M42, which has improved toughness, developed to target more robust automotive connectors and parts in close proximity to electronic components. “When increased mechanical properties are prioritised over high flow as is normally desired for small E&E parts, this grade could be an exquisite fit,” he says. Compounder Akro-Plastic has expanded its
product portfolio of PPAs with Akromid T9, which is also based on PA9T. It notes that PA9T absorbs less water than other PPAs, so its Tg is less affected after conditioning (ending up at 100°C, down from 120-125°C, whereas other PPAs can lose around 40°C) “Polymer producers usually design grades to balance properties for general purpose use,” says Conventus Polymers’ John Jorgensen. “Higher competition has led PPA producers to differentiate by developing specialty grades. The availability of specialty grades allows engineers to select formula-
40 INJECTION WORLD | September 2019
www.injectionworld.com
PHOTO: RADICIGROUP
PHOTO: BASF
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