Essentially Rubber: Tolsa positions itself as ATO-free flame retardant supplier for fire-safe alternatives

Madrid, 14 May – Spanish chemicals manufacturer Tolsa has positioned itself to supply sustainable flame-retardant alternatives to the rubber industry, offering an additive that is free from both halogens and antimony trioxide (ATO).

Suitable for rubber and plastics applications, the Adins-branded additive has been billed as a safer and more sustainable solution for fire-retardant materials, amid rising raw material prices and tightening supply in Europe.

According to Tolsa, ATO is facing increased scrutiny due to its classification as a Substance of Very High Concern (SVHC) by the European Chemicals Agency (ECHA).

Furthermore, prices have surged by over 800% in the past year, prompting manufacturers to rethink their formulations.

“Adins stands out because it delivers real ATO-free formulations improving fire performance due to its synergy effect enhancing the char formation," said Marta Sacristan, functional additives technical manager at Tolsa.

In addition, it reduces the smoke and heat release while improving the anti-dripping effect, she said in a 14 May release.

These are key features for fire performance, especially in rubber cable insulation, footwear, and protective coatings.

Furthermore, the additive enhances char formation and significantly improves fire performance across a broad range of polymer matrices, including PVC, PA, PP and rubber, Sacristan added. 

According to Tolsa, rubber compounders are among "major international compounders and producers" that are currently validating the Adins flame-retardancy products. 

Italian producer RDC Group has incorporated the additive into its Veaflame masterbatch, eliminating ATO from the formulation while meeting the "growing regulatory and environmental demands."

In rubber cable applications, Tolsa said Adins has "significantly reduced peak heat release and smoke production while improving the char structure."

Similarly, in safety shoe soles made of rubber, the new ATO-free formulation enhances fire resistance through the formation of denser and more compact char, offering a safer alternative to traditional flame retardants.

The company is also aiming to support customers with logistics and supply chain resilience.

As a European supplier, Tolsa said it can provide "shorter lead times, stable supply and better alignment with sustainability goals.”

“This is... a strategic opportunity to reduce risk, cut costs, and align with the future of fire safety,” said Antonio Esteban, chief research and technological innovation officer.