HZ info,MUTTENZ, January 27, 2026 - The changing landscape of flame retardant technology: Fire safety remains a critical concern across industries, with adhesives playing an essential but often overlooked role in preventing ignition, limiting flame spread, and reducing heat release during fire events. For decades, antimony trioxide (ATO) in combination with halogenated flame retardants has been an industry standard additive in adhesive formulations. However, significant market shifts and regulatory pressures are driving manufacturers to seek more sustainable alternatives.

The adhesives market faces unprecedented challenges with antimony trioxide:

• A staggering 6-10x price increase for ATO in recent years^[1]

• Evolving regulatory requirements affecting traditional flame retardant chemistries

• Increasing demand for alternatives from customers seeking to diversify their material options

These challenges create an urgent need for innovative solutions that maintain performance while addressing cost, regulatory, and environmental considerations.

The multi-industry impact

The implications of these ATO challenges extend across diverse sectors where adhesives play critical roles:

Construction

Innovative building materials often rely on specialized adhesives for structural bonding, panel installation, and flooring applications. Fire-resistant adhesives must perform reliably in these settings while meeting increasingly stringent building codes and sustainability certifications.

Automotive

Vehicle manufacturers face pressures of enhanced safety standards and lightweighting initiatives. Adhesives used throughout vehicle assembly require flame retardancy without the environmental concerns associated with traditional ATO solutions. Furthermore, the cost sensitivity to ATO price fluctuations creates significant challenges for maintaining economic viability.

Aerospace

Perhaps no industry demands higher performance from adhesive systems than aerospace, where flame retardancy is non-negotiable and material certification processes are exceptionally rigorous.

Clariant's more sustainable alternative

Addressing these market challenges, Clariant has developed advanced phosphinate-based flame retardants that offer a compelling alternative to antimony trioxide. These innovative solutions represent the culmination of extensive research and development focused on creating more sustainable options without compromising performance.

Unlike other flame retardants that often relied on halogenated compounds or antimony, Clariant's phosphinate-based technologies deliver effective fire protection through different chemical mechanisms. When exposed to heat, these advanced formulations can create protective barriers that inhibit flame spread and reduce heat release rates but also help avoiding or delay ignition by quenching flammable gases.

The phosphinate advantage

Clariant's phosphinate-based flame retardants offer significant benefits across multiple dimensions:

• Halogen-free composition contributes to UN Sustainable Development Goals (SDGs), e.g. by promoting safer materials (SDG 3) and enabling circular economy through recycling (SDG 12). In addition, it aligns with the GlobalABC, reducing environmental impact and supporting circular economy principles.

• Versatile compatibility with many different polymer systems enables broad application across adhesive types.

• Comparable loading levels to ATO-based systems, simplifying reformulation processes.

• Competitive cost position despite ATO's dramatic price increases.

• Superior supply security through Clariant's robust manufacturing network.

Performance without compromise

The transition from antimony-based to phosphinate-based flame retardants doesn't require sacrificing performance. Clariant's solutions have demonstrated equivalent or superior results in key testing protocols:

• Flame spread reduction

• Heat release limitation

• Smoke development minimization

• Char formation enhancement

Applications across industries

Clariant's phosphinate-based flame retardants demonstrate exceptional versatility across adhesive applications:

Construction adhesives

• Floor installation systems

• Panel bonding formulations

• Structural adhesives for engineered wood products

Automotive assembly

• Interior component bonding

• Structural adhesives for mixed-material joining

• Lightweight composite bonding systems

Aerospace applications

• High-performance structural adhesives

• Interior panel installation

• Specialty bonding systems for critical components

Clariant's phosphinate-based flame retardants extend beyond adhesives to protect engineering thermoplastics in electrical and electronics applications, wire and cable systems, automotive components, and fiber-reinforced composites.

The path forward

As regulatory frameworks continue to evolve and sustainability becomes increasingly central to material selection, the transition away from antimony trioxide represents not just a necessity but an opportunity. Clariant's phosphinate-based flame retardants offer a forward-looking solution that addresses current challenges while positioning manufacturers for future success.

The combination of performance parity, cost competitiveness, and enhanced sustainability creates a compelling case for reformulation. Additionally, the supply security provided by Clariant's manufacturing capabilities ensures consistent availability – a critical consideration in today's volatile supply chain environment.

Conclusion

The steep price increases and regulatory challenges facing antimony trioxide have created an inflection point for adhesive manufacturers. Clariant's phosphinate-based flame retardants offer a timely solution that addresses these challenges while supporting the transition to halogen-free fire protection products.

By providing halogen-free solutions that compete effectively on both cost and performance, Clariant is enabling manufacturers across construction, automotive, and aerospace sectors to maintain fire safety standards while advancing their environmental commitments. The future of flame retardant technology lies not in traditional materials like ATO but in innovative solutions that balance performance, the need for more sustainable solutions, and economic viability.

[1] https://www.procurementresource.com/resource-center/antimony-trioxide-price-trend

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