Halogen-based flame retardants (Br-FRs)
The Stockholm Convention (2001) listed 23 organo-halogen chemicals (including all BFRs) to be banned globally. The challenges of finding substitutes for banned halogen-containing flame- retardants include:
A. Lower flame retardancy: Only 10 wt% of BFRs is equivalent to about 30-50% by wt of inorganic FRs
B. High cost: Inorganic FRs is low-cost but require high loading. New HFFRs, on the other hand, are mostly costlier. The cost ratios (£) of BF-FR with phosphorous based and non- phosphorous based HFFR are about 1:6 and 1:2 respectively.
C. Higher thermal stability: Many HFFRs decompose at higher temperature (about 400°C) than their halogenated counterparts (about 3300C).
D. Melt-dripping: Melt dripping occurs with most polymers e.g. polyethylene, polypropylene, PET, ABS and so on. Flammable drips act as secondary ignition sources. FRs should make drips non-flammable.
E. Deterioration in Mechanical Properties: The deterioration of mechanical properties increase proportionately with the amount of FR. Therefore, the deterioration is more with less efficient FRs .
Novista Group supplies DBDPE, BDDP, FR245, TTBP, SR130 to global market.