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The utilisation of composites for automotive application and other industrial applications has taken on a new chapter with the introduction of a new breed of sustainable materials. Two recent developments bring into focus how innovations in composite materials will benefit fast-growing industrial sectors.
High-performance, lower-carbon polymer-bamboo composite
YTC America Inc., a wholly owned U.S. subsidiary of Yazaki Corporation, has developed a sustainable composite material. By utilising a plant-based bamboo filler, this new polypropylene (PP) composite achieves an approximate 50% reduction in carbon footprint compared to conventional PP and PP/talc composites while matching or exceeding their impact strength, heat resistance, and other performance characteristics. Initially developed for automotive applications, the composite may also find potential applications across a variety of industries seeking lower-carbon alternatives to conventional plastic composites, including packaging, logistics, electrical enclosures, and industrial equipment, without sacrificing the mechanical performance required by automotive markets and other industrial applications.
A comparison of the carbon footprint of a PP/bamboo composite with that of a conventional composite.
Approximately 1,700 species of bamboo are known worldwide. From this broad range, Yazaki selected and evaluated the most promising candidates for use in composite materials. Bamboo was selected as an eco-friendly reinforcing filler for its favourable mechanical properties. Its rapid growth also gives an estimated carbon sequestration potential four times that of traditional wood fillers like pine or fir. Its abundance and proximity to several Yazaki manufacturing locations also create opportunities to establish secure, cost-effective, and regionally based supply chains with reduced transportation-related carbon emissions.
Natural fibre–reinforced composites have historically faced challenges related to structural variability, moisture sensitivity, and inconsistent environmental performance. To overcome these limitations, Yazaki’s research and development team focused on controlling the material at every stage, from fibre selection and preparation through compounding, processing, and final-part validation.
Because natural fibres are inherently hydrophilic while polymers such as PP are hydrophobic, achieving strong interfacial bonding can be difficult. Yazaki has successfully optimised the adhesion between bamboo fibres and the PP polymer matrix, resulting in improved load transfer and supporting excellent mechanical properties. While moisture absorption is a known challenge for natural fillers under extreme environmental conditions, Yazaki's present material formulation ensures reliable performance under ambient conditions and additional material formulations for applications requiring exposure to high-temperature and high-humidity are under development. Also, the PP/bamboo composite has passed stringent automotive criteria including flammability standards, and is ready for immediate commercial evaluation. The mechanical properties of the PP-bamboo composite can be tailored to meet specific application requirements ranging from high stiffness and high thermal stability for rigid structural components to high toughness for more flexible resilient parts.
Property comparison of the PP/bamboo composite (green) and a PP/talc composite (red); bamboo dispersion inside PP matrix, strong bonding between PP and bamboo and PP/bamboo composite burn rate meeting OEM specification.
Computer tomography images show the uniform bamboo dispersion within the PP matrix, while fracture imagery demonstrates strong interfacial bonding between the bamboo fibres and polypropylene. FMVSS 302 test burn rate results also show that the PP/bamboo composite meets OEM specifications under thermal and, heat and humidity aging conditions.
By combining meaningful sustainability benefits with performance characteristics required for demanding applications, Yazaki believes its PP/bamboo composite material will help its customers to achieve their carbon-reduction goals without compromising product reliability or functionality. "Our goal was not simply to create a more sustainable material, but to create a material that customers could realistically adopt in place of existing solutions," said Dr. Rajkiran Tiwari, who YTCA’s polymer materials R&D manager. "By combining meaningful carbon-footprint reduction with performance validated through independent testing, we believe this technology has the potential to support innovation not only in automotive applications but across a wide range of industries that utilize moulded plastic components."
As organisations across industries advance decarbonization and circular-economy initiatives, materials innovation will play an increasingly important role in reducing environmental impact. Yazaki will continue working with customers, suppliers, and industry partners to evaluate opportunities for commercialization and broader adoption of the PP/bamboo composite in both existing and emerging applications.
Yazaki is evaluating the PP/bamboo composite as an eco-friendly replacement for conventional PP and PP/talc composites in applications where reduced carbon footprint and strong mechanical performance are important considerations. While YTCA’s initial development effort has focused on automotive components such as relay boxes, protective covers, and similar moulded parts, the ability to tailor the PP/bamboo composite’s properties to specific end-use requirements may also support a broad range of applications across multiple industries. Potential future applications may include: automotive and other electrical and electronic equipment components; protective housings and enclosures; industrial packaging and reusable containers; material-handling and logistics equipment such as warehouse storage systems; and other moulded plastic products seeking lower-carbon material alternatives.
As manufacturers face mounting pressure to reduce scope 3 emissions and satisfy circular-economy regulations, Yazaki is actively engaging with product developers, sustainability leaders, and manufacturers to explore commercial adoption of the PP/bamboo composite material. By combining meaningful sustainability benefits with performance characteristics suitable for demanding applications, Yazaki’s PP/bamboo composite material may provide its customers with a practical path to achieve their carbon-reduction goals without compromising product reliability or functionality.
Flame-retardant EV composites made recyclable
Korean researchers have developed, for the first time, a recyclable flame-retardant composite that overcomes a fundamental limitation of conventional flame-retardant composites, which cannot be recycled once cured, while maintaining excellent flame resistance. A research team led by Dr. Jin Chul Kim, Dr. Ji-Eun Jeong, and Dr. Young-Jae Jin at the Korea Research Institute of Chemical Technology (KRICT) has developed a self-reinforced composite (SRC) fabrication technology that simultaneously achieves improved processability, flame retardancy, and recyclability simply by adding a low-cost, low-molecular-weight polyolefin additive. The technology is expected to enable the use of lightweight and recyclable components in next-generation mobility applications such as electric vehicles, which have traditionally relied on metals or non-recyclable thermoset fibre-reinforced composites.
The research team led by Dr. Jin Chul Kim, Dr. Ji-Eun Jeong, and Dr. Young-Jae Jin at the Korea Research Institute of Chemical Technology (KRICT).
Fibre-reinforced composites, a type of thermoset composite material, have been widely used in products that require high flame resistance, including automotive components, electronic circuit boards, and electrical outlets. Because their shape becomes permanently fixed after curing, they can maintain their structural integrity even in high-temperature environments such as fires. However, once cured, these materials cannot be melted again even when heated and therefore must be landfilled or incinerated at high temperatures. With the growing emphasis on carbon neutrality, regulations on and replacement of “non-recyclable materials” have become inevitable, creating an urgent need for composite materials that are reprocessable while also providing flame retardancy and processability.
To address this challenge, the research team developed a self-reinforced composite by stacking layers of high-density polyethylene (HDPE) fibers and films, which can be reprocessed when heated. The researchers added a small amount of a low-cost, low-molecular-weight polyolefin additive to the intermediate film, enabling it to perform three functions simultaneously. The additive makes the material more flowable so that the film and fibres adhere tightly without gaps; helps the flame-retardant particles disperse uniformly without agglomerating; and can be effectively removed by washing during recycling.
Interlayer adhesion is a key factor determining the durability and safety of composite components. With the new additive, the adhesion between the film and fibres improved by approximately 40% compared with the material without the additive. In addition, although incorporating as much as 40 wt% flame retardant would normally cause a substantial decline in strength and flexibility, the composite achieved the highest flame-retardant rating, UL-94 V-0, without compromising its mechanical properties. UL-94 V-0 is the highest rating under the UL-94 vertical burning test established by Underwriters Laboratories (UL). Materials rated V-0 rapidly self-extinguish after ignition and do not produce flaming drips that ignite combustible materials below. Meanwhile, materials containing a conventional commercial additive retain more than 40% of the additive during recycling, resulting in a significant deterioration in material properties. In contrast, more than 90% of the additive used by the research team could be removed, enabling the recovery of high-purity recycled material with colour and strength comparable to those of virgin plastic.
The research team plans to conduct additional flame-retardancy tests for industrial applications and follow-up studies to ensure that flame retardants do not accumulate during repeated recycling. The team also plans to accelerate the commercialization of structural composites for next-generation mobility applications through collaboration with potential industrial users on material property evaluation and demonstration studies.