Flame Retardant Masterbatch: Benefits Over Powder Additives
Flame Retardants for Wire and Cable Compounds
Understanding the ratings
UL 94 vertical burning tests classify V-0, V-1 and V-2 by afterflame time and whether flaming drips ignite cotton below. V-0 is the strictest, requiring short afterflame and no igniting drips.
Formulation levers
Three levers control the result: total bromine delivered, the antimony trioxide synergist ratio, and anti-drip behaviour. For most styrenics and polyolefins, 12-20% brominated flame retardant with a 3:1 bromine-to-antimony ratio is the starting window.
Controlling drips
In polyolefins, flaming drips often cause a V-2 instead of V-0. A small amount of PTFE anti-drip agent, or a char-forming additive, helps achieve V-0 without raising flame-retardant loading excessively.
Frequently Asked Questions
What does UL 94 V-0 mean?
V-0 is the strictest UL 94 vertical rating: short afterflame time and no flaming drips that ignite cotton below the specimen.
How much flame retardant is needed for V-0?
Typically 12-20% brominated flame retardant plus about 4-6% antimony trioxide, adjusted for the specific polymer and part thickness.
Need a quotation or technical data sheet?
Shandong Haiwang Chemical supplies brominated flame retardants, antimony trioxide and oilfield bromides worldwide. Tell us your product, grade, quantity and destination port and our team will reply quickly. Visit our products page or contact us — email mikeyang@haiwangchemical.com.