Clariant's Fire-Fighting Additive

Could Be on Maiden Mission to Mars

Race cars, mattresses and sound pads may hardly sound like materials that aid a space mission. Yet, the flame-retardant capability in these earthly products, thanks to an additive for polyurethane foam developed by Clariant, may just be the thing needed to make man’s first flight to Mars safer.

Clariant’s non-halogenated Exolit® OP products already help repel automobile fires. When burned, vehicle plastics that contain them rapidly form a protective foam layer of char that is no longer combustible. The protective layer also cuts out the oxygen that feeds the fire. Engine plastic parts containing flame retardants also help prevent sparks from electronic components from turning into fires.

With NASA preparing to send the first humans to Mars by 2030, Clariant’s innovative flame-retardant additives are being explored to make the expedition safer.

Through a NASA-funded research project between Clariant and the Florida Institute of Technology, researchers are working to develop a more environmentally friendly flexible foam from the Exolit OP 560 series to replace rigid spray-on foam insulation.


While oxygen is substantially lacking in space, there’s still risk of fire from other atmospheric conditions, the International Association for Advancement of Space Safety and the International Space Safety Foundation said in an article on NASA’s planned Mars mission. Overheating of the spacecraft’s propellants was another factor, they noted.

“What NASA was interested in was a flexible foam that would have properties at least as good as their rigid spray on foam insulation,” said Gordon L. Nelson, professor of chemistry at Florida Institute of Technology. “We have identified Exolit OP 560 as a key ingredient in the flame-retardant flexible foams we were making.”

Prior space programs highlight the importance of flame retardant foam materials in building rockets. The fuel tank, for example, the single largest part of a space shuttle, mostly made of .32 cm thick aluminum, is the only part of the shuttle that cannot be refurbished and reused on multiple missions, meaning it is “disposable.” Polyurethane foam has been used in past missions to insulate the outer layer of the tank and protect it from the external heat of the burning rocket fuel, keeping the contents of the tank super cooled at -253 °C.

Since the disaster of space shuttle Columbia in 2003, the loss of foam on the external fuel tank has been a significant area of interest for NASA. The Columbia Accident Investigation Board did not evaluate alternative materials but highlighted the need for change.

As NASA develops new rocket technology for its Mars mission, flame retardants can play a critical role. Clariant’s Exolit OP 560 has not been used in space previously. But it has passed rigorous fire tests for multiple commercial applications that include furniture and mattresses, as well as aviation and race car seating and acoustic sound padding. The eco-friendly foam is also energy absorbing, enabling users to sit and even leap on it. 

Exolit OP 560 is a reactive flame retardant that eliminates unwanted emissions since it becomes chemically bonded within the polymeric polyurethane foam structure. As a result, the flame retardant cannot leave the foam during use. The additive is also halogen-free, and has a more favorable toxicological and environmental profile. In particular, it cannot bioaccumulate in humans and other organisms since it is "locked" into the foam.

With the planned journey to Mars being NASA’s most ambitious ever, Clariant may also be making history as manufacturer of the flame retardant used in the foam on the first manned rocket to the red planet.

Timothy Reilly
Timothy Reilly
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  • Exolit® OP

    Tailor-made flame retardant solutions

    The Exolit® OP product family is based on organic phosphorus compounds and quenches fire before it starts. more

  • Flame Retardants

    Saving lives – saving health

    Our non-halogenated flame retardants provide environmentally more compatible protection for buildings, electric and electronic equipment as well as textiles and other materials used in aeroplanes, trains, busses and ships. Clariant’s portfolio is based on phosphorus chemistry, with production sites in Knapsack, Germany, Muttenz, Switzerland and Lufeng, China. more

  • Exolit® OP 560

    Highly effective reactive, non-halogenated phosphorus polyol

    Clariant’s Exolit OP 560 is a flame retardant specifically designed for flexible polyurethane foams. As a reactive flame retardant, it can be chemically reacted into the PU matrix, preventing unwanted migration from the material. Therefore, Exolit OP 560 allows meeting the most stringent VOC requirements of the automotive industry and has shown best-in-class performance in demanding low-emission applications. Exolit OP 560 is an easily-to-handle low-viscosity liquid, with a functionality of approx. 2.Exolit OP 560 has been confirmed as »an alternative anticipated to be safer for use in upholstered polyurethane foam« by the United States Environmental Protection Agency (U. S. EPA, August 2015, EPA 744-R-15-002) more

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