ADDITIVES | FLAME RETARDANTS


on the UL yellow card, according to Stier. The material achieves a V-0 rating at 0.4 mm and CTI of 600V. “With this material Akro targets the E&E markets for switch gears and high-power circuit breakers. As the heat stabilisation does not contain any halides, which are usually used, there is no danger of contact corrosion,” he says. Akromid NEXT 5.6 3 GF 30 FR Black (8465) is a biobased polyamide 56 with a mass-bal- anced flame retardant additive


Above:


Tolsa’s AdinsFR clay-based synergists can replace some or all ATO in ATH-based cable systems


package reaching UL94 V-0 rating. The compound was specifically designed for German power distribution units manufacturer Bachmann Company and is used in its Connect Line-Compact power strip. Akro also recently launched a range of glass-


filled, flame-retardant polyketone materials, starting with its Akrotek PK-VM GF FR product. The compound is designed especially for electric vehicles, such as demanding busbar applications which are impacted by the very different Coeffi- cient of Linear Thermal Expansion (CLTE) of the metallic busbar and its insulation. The high weld line strength of the polyketone grade helps to make the compound a good candidate for these applications, according to the company. Akrotek PK-VM GF 30 FR orange (8537) recently completed RTI listing on the UL yellow card, says Stier. For high-end applications which need remark- ably high mechanical properties and outstanding dimensional stability, Akro offers flame retardant compounds based on aromatic polyarylamide. Its Akroloy Para GF 35 FR black (7496) offers high mechanical properties over a wide temperature range. With a tensile modulus of 14,500 MPa and a tensile strength of 200 MPa, the material provides strength so far only achieved by red phosphorous compounds, according to Stier. Akroloy Para’s easy flow, good surface, and low moisture uptake make


it a promising candidate for use in separators in vehicle batteries that need to pass the propagation tests, he says.


Clay synergists Flame-retardant synergist and specialist additive supplier Tolsa says its flame-retardant clay materi- als present a highly suitable alternative to antimony trioxide (ATO), one of the most widely used FR additives but one that is facing regulatory pressure due to toxicity and carcinogenicity concerns, according to Almudena Vidal, Marketing Manager in the company’s industrial business. In addition, fluctuating ATO prices and supply issues have generated some concerns among end users. The company says there is, therefore, a need for


alternatives such as its Adins clay synergists that can reduce ATO dosage without damaging perfor- mance and processability. Adins helps to reduce or eliminate ATO content in PVC or PP formulations when combined with flame retardant systems such as ATH or MDH. The synergists also drastically reduce dripping and can reduce Total Heat Release (THR) levels by more than 20% compared to competing additive solutions, the company claims. Vidal says Tolsa continues to expand its FR technology, making its Adins synergists suitable for a wide range of systems that require the highest standards of flame retardancy. The company launched a new masterbatch version of its Adins range of additives for flame retardancy at last year’s K 2022 exhibition, for example. It has now started to commercialise new masterbatch products for dif- ferent systems within the wire and cable sector, including EVA, TPE/TPU, and CPE. In a recent development, Tolsa has transferred


its Adins FR technology to PA matrices for applica- tions in electrical/electronics, automotive, textile, and transportation markets. It says the Adins technology allows the development of customised grades that guarantee compliance with specific


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