Why use Organic Phosphorus FR's?
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 FR's).
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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regarding flame retardants for PU foam and thermoplastics as well as its applications:
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:
- Physical properties
- Process ability