Posted on 19/06/2024 in Fire Safety 2024
Phosphorus PIN FR acts as antioxidant

Research shows that DOPO-derivate coated APP can provide both fire resistance and anti-ageing in EVA (Ethylene Vinyl Acetate), a performance polymer used in e.g. cables, transport, construction, sealants. The widely available PIN FR DOPO* was reacted with glutaraldehyde, then used to coat APP**. At 25% loading the resulting PIN FR achieved UL94 V-0 (3 mm) and LOI*** increased from 17% (neat EVA) to 27%, reduced peak heat release by -52% and maximum smoke density by -54%. The PIN FR increased the oxidation induction time of EVA by nearly 4x and very considerably improves the elongation at break of the EVA after 4 – 14 days @ 165 or 180°C, that is shows an anti-ageing effect.

* DOPO = 9,10-Dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (diagram)

** APP = ammonium polyphosphate, inorganic phosphorus PIN FR

*** LOI = Limiting Oxygen Index

“Unlocking anti-aging potential: Flame retardants thrive without added antioxidants”, P. Sun et al., Composites Part B 279 (2024) 111450,

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