DuPont Filaments – Now Owned by Celanese

Design Freedom. Limitless Possibilities.

Our ownership may have changed but our commitment to provide the highest quality filament remains the same.

For more than 70 years, DuPont Filaments was recognized as a leader in innovative synthetic filaments that enable brush manufacturers to address emerging trends and meet evolving consumer expectations. Building on a legacy of innovation, its global team of scientists and development engineers continued to expand the broad range of filament offerings for premium quality brushes and industrial applications, giving leading global brands and brush manufacturers ever more flexibilities in brush designs. Now, the products and innovation continue under the new ownership of Celanese.

Health deserves the best filaments - Toothbrush Filaments


The most important component of a toothbrush lies in the bristle. With outstanding industry expertise accumulated over the years, coupled with proven technologies, Celanese is dedicated to the oral care brush industry with our nylon solutions under the brand names of Tynex®(nylon 612) and Herox®(nylon 610). Leading toothbrush brands and manufacturers are able to produce very high quality brushes with a balance of consistent quality, wear performance and unmatched productivities in tufting and end rounding. As consumer trends in toothbrush are increasingly focused on the six major areas of:

1. Visual Attractiveness
2. Interdental Cleaning
3. Plaque Removal
4. Gum Comfort
5. Gingival Cleaning
6. Anti microbial properties within the filament

"The company has been working closely with the leading global brands in oral care as well as toothbrush manufacturers by fulfilling these needs with our broad range of innovative products in the portfolio."


Tynex® Brilliance Pro filaments are a prime example of the company’s newest innovation that combines both visual attractiveness and functional benefits. With its unique diamond shape profile and distinguished color effects, it is the ultimate filament for premium toothbrushes. The soft bristle of Tynex® Brilliance Pro, with its outstanding translucency and glistening look brought by a proprietary color recipe, will make any toothbrush an “eye catcher” on the shelf while retaining the superior cleaning ability for interdental and plaque removal performance.

As Herox® was successfully reintroduced to the toothbrush filament market, it is known as a “green” material, with 67% of its ingredients coming from renewable sourced raw material.

Another innovation, Herox® Binchotan Filaments was added to the product portfolio in 2015 to provide tailor made solutions targeting customer needs and growth in Asia Pacific. Capturing the emerging trend of using charcoal in various dispensary applications especially in Asia, yet another innovation was brought to the market by combining nylon and binchotan charcoal powder. The binchotan charcoal powder used is manufactured from 100% natural wood through a specialized carbonization process in Japan, where binchotan originated.

The combination of nylon and binchotan, with perceived functional benefits commonly known in Asia and increasingly in other regions, allows toothbrush designers to bring new concepts of toothbrushes to consumers. Herox® Link filament is another member of the Herox® family and a new nylon material using co extrusion technology. It was recently introduced to toothbrush customers who are seeking alternative nylon filament solutions with better cost effectiveness that also retains excellent performance and softness.

Fine Filaments

When it comes to the cosmetics industry, consumer needs are dynamic and ever changing. There is also an increasing expectation for high performance tools as consumer cosmetic applications are more and more specialized towards professional grades. From powder to eyeliner, mascara to nail polish, as well as facial cleaning brushes, consumers are looking for brushes with high performance, durability, ease of cleaning, soft touch-and-fill, powder pickup/ release/ ... etc. Even if different types of animal hair are still available as options for cosmetic brushes in the market, responsible cosmetic brands are leading the trend to be “cruelty free” and use only synthetic filaments in their brushes.

Natrafil® filaments, a pioneering filament from the company’s unique polyester based material, contain proprietary texturizing additives that create a structured surface that mimics animal hair. Natrafil® filaments offer a synthetic alternative to animal hair in premium cosmetic powder brushes with more consistency in the bristle while maintaining the touch and feel of premium animal hair. Studies have shown that brushes made with Natrafil® filaments have superior pickup and release performance versus brushes made with animal hair. Hygiene in cosmetic products is a serious concern. If you think your makeup brush is bacteria free, think again. Infection causing bacteria can thrive in cosmetic brushes and products that are not adequately cleaned or used beyond its indicated product lifespan. The company is helping to tackle this problem with Tynex® StaClean® fine filaments.

Independent verification by authoritative third- party testing agency has confirmed that Tynex® Staclean® fine filaments are 99% effective in bacteria inhibition. This is due to the silver-oxygen combination in the filaments that inhibits the growth of micro organisms. The launch of Tynex® StaClean® fine filaments addresses the hygienic concern for cosmetic brushes.

Abrasive Filaments

Like most industries, steel manufacturers are always looking for ways to increase productivity. The emphasis is on getting more square feet of metal through the mill, cleaned and coated faster than ever before. To accomplish this, steel mills are using more aggressive cleaning solutions creating a degradation problem with typical cleaning brushes because many plastics used in the brush filaments can’t handle the extreme pH solutions.

Our technical team has solved this problem by adding stabilizers to one of our nylon polymer formulations, effectively extending the pH range where our filaments can be used. Brushes made with these filaments deliver cleaning performance over an improved service life, helping steel manufactures achieve higher productivity. Another need voiced by customers is higher aggressiveness in metal finishing applications. Tynex® A ceramic grit-containing filaments were developed to meet this need.

Paintbrush Filaments

As paint manufacturers continue to improve water-based paints, there is a need for higher performing brushes. We continue to innovate and provide specialized solutions for our customers. Brushes made with our filament provide better paint pick up, faster application and easier clean-up. 

Efficiency deserves the best filaments - Abrasive Filaments.
Creativity deserves the best filaments - Paintbrush Filaments

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