What are flame retardants?

Flame retardants are various chemicals applied to materials to prevent burning or slow the spread of fire. The term applies to the function, not a specific composition, of these chemicals.

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Flame retardants are studied because of their abundance in the environment and concerns about their potential health effects.

Where are flame retardants used?

Since the s, flame-retardant chemicals have been added to many types of products:

• Furnishings such as seating foam and coverings (including transport vehicles), mattresses, and carpets.
• Electronics and electrical devices such as computers, phones, televisions, and household appliances.
• Building and construction materials such as coatings for electrical wires and cables, polystyrene foams, and polyurethane insulation such as spray foams.

Because these chemicals do not easily break down, they can remain in the environment and in a body for years. Studies show that some may be hazardous to people and animals.

How are people exposed to flame retardants?

People can come in contact with flame retardants in a variety of ways.

• Chemicals can leach from products into the air and then attach to dust, food, and water, which can be ingested.
• Chemicals seep into the air, water, and soil during manufacturing or application.
• Similarly, the burning or dismantling of electrical and electronic equipment

What are some of the potential health effects associated with flame retardants?

Learning how these chemicals, and in what amounts, may cause human health effects is an area of active research. Although flame retardants can offer benefits when added to certain products, increasing scientific evidence shows that many of these chemicals may harm animals and humans.

Adverse health effects may include endocrine and thyroid disruption, immunotoxicity, reproductive toxicity, cancer, and adverse effects on fetal and child development and neurobehavioral function.

Who is most vulnerable?

Children are more vulnerable to toxic effects because their brains and other organs are still developing. Hand-to-mouth behavior and play that is close to the floor increases the potential of children to come in contact with harmful chemicals. Several studies demonstrate that exposure is higher in children than adults.

Chronic exposure to flame retardants in the general population, as well as evidence of neurotoxicity from animal studies, raises concern for neurodevelopmental effects in all people.

What is known about different types of flame retardants?

The hundreds of different flame retardants are often grouped according to chemical structure and properties. In general, such groups may be based on whether the flame retardant contains bromine, chlorine, phosphorus, nitrogen, metals, or boron. A few types are described here.

Brominated flame retardants (BFRs) contain bromine and are used in many electronics, furniture, and building materials. BFRs have been linked to endocrine disruption and thyroid disfunction. Older compounds have been replaced by new versions that also show toxic endocrine effects.

Hexabromocyclododecane (HBCD) is a brominated flame-retardant additive used primarily in polystyrene foam building materials. HBCD enters the environment during its production and by leaching from consumer products. It has been found to enter the food supply. Health concerns include alterations in immune and reproductive systems, neurotoxic effects, and endocrine disruption.

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Organophosphate flame retardants (OPFRs) are widely used in textiles, electronics, and industrial materials and as replacements for other types of flame retardants. Studies suggest these chemicals could pose a risk to bone and brain health.

Polybrominated diphenyl ethers (PBDEs) do not chemically bind with the products to which they are added, such as furniture, and are easily released into air and dust. Production was phased out beginning in . Despite phaseout, this compound is stabile in the environment and products containing PBDEs remain in use, suggesting exposure will continue for some time. A major effort has been devoted to evaluating potential health risks. Evidence links human exposure to neurodevelopmental disorders.

Tetrabromobisphenol A (TBBPA) is used in plastic paints, synthetic textiles, and electronic devices, and as an additive in other flame retardants. This compound was found to cause cancer in rats and mice.

Wire and Cable Compounds

• Treated precipitated & ground ATH &#; Hymod® and Martinal® Grades 
• Molybdates &#; Kemgard® 911C and Kemgard® HPSS
• Untreated ATH 1 to 6 microns &#; Martinal®, Hydral® and Micral® Grades
• Treated and untreated MDH &#; Vertex® 100 Series Grades
• Treated and untreated premium MDH &#; Magnifin® and Zerogen® Grades

Wire and cable applications require flame retardance and low smoke generation. Huber has a full line of treated Alumina Trihydrate (ATH), Magnesium Hydroxide (MDH) and Kemgard® products that impart outstanding flame retardance and smoke suppression in wire and cable compounds.

Martinal and Hydral fine precipitated hydrates are designed to have high purity and low conductivity.  They can be used at high loadings in both the insulation layer and in jacketing compounds for wires with varying voltage requirements. 

In jacketing compounds, Micral ultrafine ground ATH can be an economical alternative to precipitated ATH.

Especially in high performance applications, surface treated ATH and MDH products offer these advantages compared with untreated products in wire and cable compounds:

• Improves dispersion uniformity
• Higher throughput rates
• Enhances flame retardant performance
• Increases color stability
• Improves physical properties and electrical performance (lower conductivity)

Kemgard products are ideal smoke suppressants used for plenum cable jacketing to meet the smoke requirement of UL 910.  Click on the technical paper below for more information.

Huber offers comprehensive technical guidance in using its array of high performing flame retardants and smoke suppressants. 

Contact Us or visit our Product Finder to learn more and obtain samples of our flame retardants and smoke suppressants.

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