Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:


DuPont™ Hytrel® and DuPont™ Zytel® contribute to durable and lightweight all-plastic safety shoes

Footwear and outerwear manufacturer Yakupoglu A.S. of Ankara, Turkey, uses DuPont™ Hytrel® thermoplastic polyester elastomer and DuPont™ Zytel® nylon to replace the metal eyelets and midsole support in its new durable and lightweight non-metallic safety shoes.

Hytrel® was selected for the shoe’s eyelets due to its flexibility, even at low temperatures, and its suitability for stitching to the leather upper. Zytel® was chosen for the shoe’s midsole support due to its high flexural modulus, helping to stiffen the polyurethane sole and provide more protection and comfort for the wearer. By changing to polymer components, Yakupoglu is able to save weight and manufacturing cost, while prolonging the lifetime of its shoes.

Photo: DuPont
For its new, non-metallic safety shoes, footwear manufacturer Yakupoglu A.S. uses flexible and stitchable DuPont™ Hytrel® thermoplastic polyester elastomer for the eyelets (top right and highlighted on shoe) and strong, stiff DuPont™ Zytel® nylon for its midsole support (pictured below, not visible on shoe as it is embedded in its sole).

The adoption of Hytrel® for the shoes’ eyelets and Zytel® for their midsole supports represented the final stage in Yakupoglu’s drive to replace metal in its safety shoes. “The availability of an all-polymer safety shoe can be of crucial significance to workers in industries where passing through metal detectors may be part and parcel of their jobs, for example luggage handlers at airports,” explains Ismail Harmandar, production manager at Yakupoglu. A reduction in the overall weight of the shoes, without impairing safety performance, and the elimination of potential corrosion sources are further benefits to the user. The manufacturing benefits of an all-polymer shoe include fewer material stocks and the deployment of cost-efficient manufacturing processes, according to Yakupoglu.

“The greatest challenge to date was finding a material to replace the steel commonly used for eyelets, where the right combination of flexibility and toughness over a wide temperature range was imperative in providing a durable component that could also be easily integrated into our overall production process. DuPont, and more specifically Hytrel®, provided that solution,” says Ismail Harmandar. Rows of four eyelets, measuring approximately eight centimetres in length and two centimetres high, are moulded in-house by Yakupoglu before being stitched to the leather upper by industrial sewing machines. “If the material is too stiff it will break during stitching, too soft and it may tear during use,” explains Ismail Harmandar further.

A 30% glass-reinforced grade of Zytel® nylon is used to produce the midsole support for the shoes, which runs under the arch of the foot above the polyurethane sole, and provides more protection and comfort for the wearer. The material was chosen for its high stiffness when flexed over multiple cycles, and processing ease. “The support provided by DuPont when determining which materials we could use for these applications was second to none. Whether material performance and analysis, processing advice or general design guidance, DuPont provided us with the best answers,” concludes Ismail Harmandar.

Part of Yakupoglu’s non-metallic range of safety footwear, the DuPont engineering thermoplastics currently feature in its UL 100 lightweight safety training shoe and the UL 110 lightweight safety boot. Both shoes are true non-metal constructions throughout, with the soles produced from a combination of polyurethane (PU) for the midsole and thermo-polyurethane (TPU) for the outsole. The non-metal toe caps of the shoes are made from thermoplastic and are resistant to 200 joules. Both models are S1 safety classified according to European Standard EN345, and have antistatic properties as well as being oil and slip resistant. They are available under Yakupoglu’s own brand of ‘YDS’ in Turkey or under national brands throughout Europe and the Middle East.

Yakupoglu is a company manufacturing various military and police footwear, garments and accesories, worker safety shoes and firemen boots. Founded in 1927, its product spectrum consists of safety footwear, uniform and tactical footwear, sport shoes, Goodyear welted and unit soled shoes, Gore-Tex breathable and water resistant boots, summer boots, winter boots and snow boots. Its ‘YDS’ branded safety footwear and equipment are produced according to norms EN ISO 20345 and EN ISO 20345.

The DuPont Engineering Polymers business manufactures and sells Crastin® PBT and Rynite® PET thermoplastic polyester resins, Delrin® acetal resins, Hytrel® thermoplastic polyester elastomers, DuPont™ ETPV engineering thermoplastic vulcanizates, Minlon® mineral reinforced nylon resins, Thermx® PCT polycyclohexylene dimethyl terephthalate, Tynex® filaments, Vespel® parts and shapes, Zenite® LCP liquid crystal polymers, Zytel® nylon resins and Zytel® HTN high-performance polyamides. These products serve global markets in the aerospace, appliance, automotive, consumer, electrical, electronic, healthcare, industrial, sporting goods and many other diversified industries.

DuPont is a science-based products and services company. Founded in 1802, DuPont puts science to work by creating sustainable solutions essential to a better, safer, healthier life for people everywhere. Operating in more than 70 countries, DuPont offers a wide range of innovative products and services for markets including agriculture and food; building and construction; communications; and transportation.

The DuPont Oval, DuPont™, The miracles of science™, Hytrel®, Zytel® and all other product names denoted with ® are registered trademarks or trademarks of E.I. du Pont de Nemours and Company or its affiliates.

This press release is based on information provided by:
Yakupoglu A.Þ.
Havalimaný Yolu 20. Km.
06750 Akyurt-Ankara
Tel. +90 312 398 12 13
Fax: +90 312 398 08 78

Horst Ulrich Reimer | Du Pont
Further information:

More articles from Materials Sciences:

nachricht The search for dark matter widens
21.03.2018 | American Institute of Physics

nachricht Scientists have a new way to gauge the growth of nanowires
19.03.2018 | DOE/Argonne National Laboratory

All articles from Materials Sciences >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Researchers at Fraunhofer monitor re-entry of Chinese space station Tiangong-1

In just a few weeks from now, the Chinese space station Tiangong-1 will re-enter the Earth's atmosphere where it will to a large extent burn up. It is possible that some debris will reach the Earth's surface. Tiangong-1 is orbiting the Earth uncontrolled at a speed of approx. 29,000 km/h.Currently the prognosis relating to the time of impact currently lies within a window of several days. The scientists at Fraunhofer FHR have already been monitoring Tiangong-1 for a number of weeks with their TIRA system, one of the most powerful space observation radars in the world, with a view to supporting the German Space Situational Awareness Center and the ESA with their re-entry forecasts.

Following the loss of radio contact with Tiangong-1 in 2016 and due to the low orbital height, it is now inevitable that the Chinese space station will...

Im Focus: Alliance „OLED Licht Forum“ – Key partner for OLED lighting solutions

Fraunhofer Institute for Organic Electronics, Electron Beam and Plasma Technology FEP, provider of research and development services for OLED lighting solutions, announces the founding of the “OLED Licht Forum” and presents latest OLED design and lighting solutions during light+building, from March 18th – 23rd, 2018 in Frankfurt a.M./Germany, at booth no. F91 in Hall 4.0.

They are united in their passion for OLED (organic light emitting diodes) lighting with all of its unique facets and application possibilities. Thus experts in...

Im Focus: Mars' oceans formed early, possibly aided by massive volcanic eruptions

Oceans formed before Tharsis and evolved together, shaping climate history of Mars

A new scenario seeking to explain how Mars' putative oceans came and went over the last 4 billion years implies that the oceans formed several hundred million...

Im Focus: Tiny implants for cells are functional in vivo

For the first time, an interdisciplinary team from the University of Basel has succeeded in integrating artificial organelles into the cells of live zebrafish embryos. This innovative approach using artificial organelles as cellular implants offers new potential in treating a range of diseases, as the authors report in an article published in Nature Communications.

In the cells of higher organisms, organelles such as the nucleus or mitochondria perform a range of complex functions necessary for life. In the networks of...

Im Focus: Locomotion control with photopigments

Researchers from Göttingen University discover additional function of opsins

Animal photoreceptors capture light with photopigments. Researchers from the University of Göttingen have now discovered that these photopigments fulfill an...

All Focus news of the innovation-report >>>



Industry & Economy
Event News

Virtual reality conference comes to Reutlingen

19.03.2018 | Event News

Ultrafast Wireless and Chip Design at the DATE Conference in Dresden

16.03.2018 | Event News

International Tinnitus Conference of the Tinnitus Research Initiative in Regensburg

13.03.2018 | Event News

Latest News

TRAPPIST-1 planets provide clues to the nature of habitable worlds

21.03.2018 | Physics and Astronomy

The search for dark matter widens

21.03.2018 | Materials Sciences

Natural enemies reduce pesticide use

21.03.2018 | Life Sciences

Science & Research
Overview of more VideoLinks >>>