As yellow phosphorus prices navigate a period of post-decline volatility, our latest market analysis explores how shifting raw material costs are triggering a critical industry 'shakedown' for downstream phosphorus-based flame retardants.
Inorganic flame retardants such as ATH and MDH require high loading levels in TPU to achieve the required flame retardancy rating; however, high loading levels severely degrade the material’s mechanical properties and flexibility. Through nano-blending strategies—such as the physical barrier effect of nano-clay layers and the carbonization mechanism of expandable graphite—it is possible to enhance flame retardancy while reducing the amount of inorganic additives, thereby providing an alternative to phosphorus-based flame retardants for TPU.
When selecting PU phosphorus-based flame retardants, the key consideration is not the dosage but rather the compatibility between the decomposition temperature and the substrate. This article analyzes the differences in applicability among the three major systems—APP-based, organophosphorus, and red phosphorus—as well as key technical aspects such as migration and leaching, and intumescent flame retardancy.