One of the major classes of flame retardants for thermoplastics and polyurethane
foams is that of organic phosphorus compounds (typically
phosphates and phosphonates). These may also include phosphorus-halogen
compounds and blends of phosphorous with halogenated flame retardants
(typically brominated FRs).
Thermoplastic alloys such as PC/ABS and PPO/HIPS
are often required to meet stringent FR standards such as UL94 V0.
Phosphate based FR's work efficiently in these resins and give good
physical properties and good UV stability
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specific information regarding flame retardants for PU foam and thermoplastics
as well as its applications:
Additional information on formula
optimization or on specific standards can be found in
Technical Assistance
In many applications, rigid and flexible polyurethane foams are required to
exhibit a degree of flammability resistance in order to pass specific
flammability tests in any given country. Phosphorus based flame retardants,
both chlorinated (chlorophosphates) and non-halogenated are extensively used in
these applications and are considered an ideal choice, giving a good balance of
process ability, flame retardancy and physical properties. In some instances
Phosphorous bromine blends are used particularly where low scorch is required.
Depending on the final application, its key requirements and the flammability
standards they must meet, PUR foam producers have the flexibility to choose
among reactive additive, halogenated and non-halogenated phosphorus based flame
retardants. These options provide a versatile selection for
addressing the market needs of:
Performance
