HALOGENATED FLAME RETARDANTS

Halogenated flame retardants encompass a large group of bromine or chlorine-containing chemicals that all share a similar function (i.e., fire retardation). 
Halogenated flame retardants contain carbon–halogen bonds, most commonly carbon–bromine or carbon–chlorine bonds.
Halogenated flame retardants when exposed to heat, they release halogen radicals.

CAS Number: 97416-84-7
Molecular Formula: C23H24Br8O2
Molecular Weight: 971.67
EINECS Number: 306-832-3

Synonyms: 97416-84-7, 1,1'-(Isopropylidene)bis(3,5-dibromo-4-(2,3-dibromo-2-methylpropoxy)benzene), EINECS 306-832-3, 1,1'-(ISOPROPYLIDENE)BIS[3,5-DIBROMO-4-(2,3-DIBROMO-2-METHYLPROPOXY)BENZENE], EC 306-832-3, DTXSID80893715, 306-832-3, RefChem:409124, DTXCID401323738, 1,3-dibromo-5-[2-[3,5-dibromo-4-(2,3-dibromo-2-methylpropoxy)phenyl]propan-2-yl]-2-(2,3-dibromo-2-methylpropoxy)benzene, SCHEMBL2043886, IYOVSGHZOIZSDC-UHFFFAOYSA-N, NS00002416, Bis(2,3-dibromo-2-methylpropyl ether)-Tetrabromobisphenol A, 1,1'-(Propane-2,2-diyl)bis[3,5-dibromo-4-(2,3-dibromo-2-methylpropoxy)benzene], 1,1-(Isopropylidene)bis[3,5-dibromo-4-(2,3-dibromo-2-methylpropoxy)benzene], Benzene, 1,1'-(1-methylethylidene)bis[3,5-dibromo-4-(2,3-dibromo-2-methylpropoxy)], 1,1'-(isopropylidene)bis[3,5-dibromo-4-(2,3-dibromo-2-methylpropoxy)benzene];1,1'-(1-Methylethylidene)bis[3,5-dibromo-4-(2,3-dibromo-2-methylpropoxy)benzene];1,1'-(2,2-Propanediyl)bis[3,5-dibromo-4-(2,3-dibromo-2-methylpropoxy)benzene];2,2-Bis[3.5-dibromo-4-(2,3-dibromo-2-methyipropoxy)phenyl]propane;1,1'-(Isopropylidene)Bis[3,5-Dibromo-4-(2,3-Dibromo-2-Methylpropyxy)Benzene;1,3-dibromo-5-[2-[3,5-dibromo-4-(2,3-dibromo-2-methylpropoxy)phenyl]propan-2-yl]-2-(2,3-dibromo-2-methylpropoxy)benzene;2,2-Bis[3,5-dibromo-4-(2,3-dibromo-2-methylpropoxy)phenyl]propane;Tetrabromobisphenol A bis(dibromomethylpropyl ether)

Halogenated flame retardants are a class of organic compounds containing halogen atoms (such as chlorine or bromine) that are added to materials to reduce flammability and slow fire spread.
They are widely used in plastics, textiles, electronics, and construction materials.
Their effectiveness is mainly due to the presence of halogen elements.

The primary mechanism of action is gas-phase radical quenching.
During combustion, halogen radicals react with high-energy hydrogen and hydroxyl radicals in flames.
This interrupts the free-radical chain reaction responsible for fire propagation.

Halogenated flame retardants may appear as solid powders, liquids, or polymer-bound additives, depending on the specific compound.
They can be either additive (physically mixed into materials) or reactive (chemically bonded to polymers).
Their form depends on the intended application.

These compounds are known for high flame-retardant efficiency at relatively low loading levels.
Brominated flame retardants are generally more effective than chlorinated ones.
This efficiency has contributed to their widespread use.

Halogenated flame retardants are commonly used in electronic equipment, insulation materials, upholstery, and building products.
They help meet fire-safety standards and reduce ignition risk.
Many are incorporated into plastics such as ABS, polystyrene, and epoxy resins.

Some halogenated flame retardants have raised environmental and health concerns.
Certain older compounds are persistent, bioaccumulative, and potentially toxic.
As a result, regulatory restrictions exist for specific substances.

Modern formulations increasingly aim to reduce environmental impact.
Some halogenated systems are being replaced by non-halogenated alternatives, especially in consumer products.
Regulatory compliance is important in their use.

Halogenated flame retardants are fire-suppressing additives that function by interrupting combustion chemistry, widely used in fire-safety applications but subject to environmental and regulatory considerations.
Apart from containing one or more halogens, these chemicals can significantly differ in their physical, structural, and chemical properties.

Halogenated flame retardants are a diverse group of chemicals that are added to manufactured materials, such as plastics and textiles, and surface finishes and coatings.
Halogenated flame retardants are activated by the presence of an ignition source and prevent or slow the further development of flames by a variety of different physical and chemical mechanisms. 

They may be added as a copolymer during the polymerisation process, or later added to the polymer at a moulding or extrusion process or (particularly for textiles) applied as a topical finish.
Mineral Halogenated flame retardantsare typically additive, while organohalogen and organophosphorus compounds can be either reactive or additive.
These radicals interfere with the combustion chain reaction.

Molecular weight: 943.66 g/mol
Boiling point: 685.3 ± 55.0 °C (predicted)
Density: 2.079 ± 0.06 g/cm³ (predicted)
Vapor pressure: 0 Pa (25 °C)
Water solubility: 20 µg/L (20 °C)
InChI: InChI=1S/C23H24Br8O2/c1-21(2,13-5-15(26)19(16(27)6-13)32-11-22(3,30)9-24)14-7-17(28)20(18(29)8-14)33-12-23(4,31)10-25/h5-8H,9-12H2,1-4H3
InChIKey: IYOVSGHZOIZSDC-UHFFFAOYSA-N
SMILES: C(C1=CC(Br)=C(OCC(Br)(C)CBr)C(Br)=C1)(C1=CC(Br)=C(OCC(Br)(C)CBr)C(Br)=C1)(C)C
LogP: 12.42

Halogenated flame retardants are typically divided into brominated and chlorinated types.
Halogenated flame retardants are generally more effective because bromine radicals are highly efficient at disrupting flame chemistry.
Chlorinated versions are also used but may require higher loading levels.

These compounds can be either additive or reactive flame retardants.
Additive types are physically blended into polymers.
Reactive types are chemically bonded into the polymer structure during manufacturing, reducing migration.

During combustion, Halogenated flame retardants may also promote the formation of a protective char layer.
This layer helps insulate the material and slow heat transfer.
In some systems, they work together with synergists such as antimony trioxide.

Halogenated flame retardants are commonly incorporated into thermoplastics, thermosets, foams, and textiles.
They are especially prevalent in electrical and electronic equipment.
Their use helps meet strict fire-safety regulations.

One key advantage is their high thermal stability, which allows them to withstand processing temperatures of many plastics.
This makes them suitable for extrusion and molding processes.
Their compatibility with polymers is an important design factor.

Some older halogenated flame retardants have been found to be persistent in the environment.
They may accumulate in soil, water, and living organisms.
This has led to increased monitoring and regulatory controls.

Concerns have also been raised regarding the formation of toxic byproducts during combustion, such as halogenated dioxins or furans under certain conditions.
These concerns have driven research into safer alternatives.
Many manufacturers now evaluate lifecycle environmental impact.

As a result, industry trends increasingly favor halogen-free flame-retardant systems in consumer electronics and construction materials.
However, halogenated flame retardants remain widely used where high fire performance is required.
Selection depends on performance, cost, and regulatory compliance.

Halogenated flame retardants are highly effective fire-suppression additives, but their environmental persistence and potential health concerns have influenced regulatory and industrial shifts toward alternative technologies.
Halogenated flame retardants are chemical compounds added to plastics to slow the spread of fire. 

Uses Of Halogenated flame retardants:
Methyl octabromo ether(DXFR 640) can replace hexabromocyclododecane flame retardant for XPS (extruded polystyrene) and EPS (expanded polyethylene) flame retardant.
Halogenated flame retardants are widely used in electrical and electronic equipment.
They are incorporated into circuit boards, connectors, housings, and cables.

This helps prevent ignition and slow flame spread in electronic devices.
In plastics and polymer manufacturing, they are added to thermoplastics such as ABS, polystyrene, polypropylene, and polycarbonate.
They improve fire resistance in molded components.

These applications are common in appliances and consumer products.
Halogenated flame retardants are used in printed circuit boards (PCBs), especially in epoxy resins.
They help meet fire-safety standards for electronic assemblies.

This reduces the risk of electrical fires.
In construction materials, they are used in insulation foams, sealants, and coatings.
They enhance fire performance in building structures.

This supports compliance with building safety codes.
In textiles and upholstery, halogenated flame retardants are applied to fabrics and foams.
They reduce flammability in furniture and transportation seating.

This improves fire safety in public and private spaces.
In the automotive industry, they are incorporated into interior components, wiring systems, and plastic parts.
They help reduce fire risk in vehicles.

These applications are designed to meet transportation safety standards.
Halogenated flame retardants are used in industrial equipment and machinery housings.
They protect high-temperature or high-voltage components.

This increases operational safety.
In aerospace and specialized engineering materials, they are used where high fire resistance is required.
They provide protection under extreme conditions.

Halogenated flame retardants have better flame retardant efficiency than brominated aromatic flame retardant. 
These uses are highly regulated.
Halogenated flame retardants are used wherever enhanced fire resistance and compliance with fire-safety regulations are necessary across electronics, construction, transportation, textiles, and industrial applications.

Halogenated flame retardants is an additive flame retardant. 
Halogenated flame retardants has the advantage of low dosage, good flame retardant effect, little influence on the physical properties of materials, good thermostability and UV stability, mainly used for EPS, XPS polypropylene and other styrol resin.
Halogenated flame retardants can make the processing equipment more safety. Especially more appropriate for plastic products with high processing temperature. 

Safety Profile Of Halogenated flame retardants:
Halogenated flame retardants present varying levels of health and environmental hazards, depending on the specific compound.
Some older types are associated with persistence, bioaccumulation, and toxicity.
Risk assessment depends on chemical structure, exposure route, and regulatory status.

Skin contact with certain halogenated flame retardants may cause irritation or sensitization.
Repeated exposure can lead to dermatitis in some cases.
Protective gloves are recommended during handling of raw materials.

Inhalation of dust or vapors during manufacturing may cause respiratory irritation.
Fine particulate forms can be inhaled if proper dust control is not used.
Industrial ventilation and respiratory protection may be required.

Some halogenated flame retardants have been associated with endocrine disruption and developmental toxicity in laboratory studies.
Certain compounds have been restricted or phased out due to these concerns.
Regulatory oversight varies by region.

Several compounds in this class are known to be persistent and bioaccumulative.
They can remain in the environment for long periods and accumulate in living organisms.
This has led to environmental monitoring programs.