Flame retardant materials are either specially treated or naturally resistant to fire. They stop or delay the spread of fire through chemical and physical processes.
Materials are classified according to how they are constructed and what they are used for. There is a difference between flame retardant and fire resistant materials - they have different properties and are used in different ways.
Flame retardant materials are those that are either treated with flame retardants or have natural properties that make them difficult to ignite and slow the spread of fire. Flame retardants are thus chemicals added to make the material less flammable.
There are two main categories:
Classification by chemical composition:
| Type | Examples | Application |
|---|---|---|
| Organic | Polybrominated diphenyl ethers, phosphorus compounds | Plastics, textiles |
| Inorganic | Aluminum hydroxide, magnesium hydroxide | Building materials, cables |
| Halogenated | Bromine-based compounds | Electronic equipment |
| Non-halogenated | Trisodium phosphate, red phosphorus | More environmentally friendly alternatives |
Flame retardants hinder combustion in several ways. The idea is to change the way the material reacts to heat and flames.
Physical mechanisms involve the formation of a protective layer on the surface that insulates against heat. Often, water vapor is released when certain inorganic agents are heated, diluting the combustible gases.
Chemical processes may involve, for example, the release of radicals by brominated flame retardants that disrupt the combustion chain itself.
Flame retardant textiles are used in workwear for welders, firefighters and people in heavy industry. If they are made to the right standards, they retain their protection even after many washes.
Flame-retardant materials are made to be flame-retardant and to slow down flames. They are either treated with chemicals or have natural properties that make them difficult to burn.
Fire-resistant materials are more about keeping their shape and strength even when it gets really hot. They can withstand high temperatures without losing their properties.
Flame retardants are used in workwear, furniture, insulation and electronics. Fire-resistant items are more often found in load-bearing building components such as columns and walls.
Workwear is often labeled to indicate the level of flame retardancy. Clothing for welders needs significantly higher protection than office furniture, for example.
Flame retardant materials are classified according to their chemical composition and their use. Organic and inorganic systems are the most common, but there are also special solutions for plastics, insulation and textiles.
Halogen-based flame retardants are the largest group among the organic ones. They release halogen gases when heated, diluting the combustible gases and disrupting combustion.
Brominated and chlorinated compounds are mostly used in electronics and plastics. They work well, but are not very popular from an environmental point of view as they can remain in nature for a long time.
Phosphorus-based systems work by creating a protective carbon layer on the surface. They are kinder to the environment than the halogen alternatives and are used in textiles, foams and wood-based products.
Nitrogen-based flame retardants release nitrogen gas that dilutes the oxygen where it burns. Melamine cyanurate and ammonium phosphate are typical examples.
Inorganic flame retardants such as aluminum hydroxide and magnesium hydroxide release water vapor when heated, which cools and dilutes. Antimony trioxide is sometimes used with halogen compounds to enhance the effect.
Polyvinyl chloride (PVC) already has chlorine in it, which provides some basic protection against fire. Antimony compounds are often added to make cables and building materials even safer.
Polyurethane and other foams are treated with phosphorus-based agents that form a protective carbon layer. This prevents heat and gases from spreading.
PET plastics get their flame retardancy from phosphorus or halogen compounds, especially when used in electronics or cars. The flame retardancy is baked in already during polymerization.
Epoxy resins are widely used in electronics where very precise flame retardants are required. Here, phosphorus-containing monomers are built directly into the plastic to provide permanent protection.
There is a lot of talk now about halogen-free alternatives, such as nanocomposites with clay or graphene, to reduce environmental impact.
Mineral wool made of stone or fiberglass is considered non-combustible and can withstand temperatures above 1000°C. It retains its insulation even when it gets really hot.
Polyurethane foam gets its flame retardancy by adding liquid agents during production. Phosphorus-based additives allow it to self-extinguish and produce less smoke.
Polystyrenefoam is flame retarded with hexabromocyclododecane or newer halogen-free variants. The key is to find a balance so that the insulation still works.
Reflective insulation is a combination of aluminum foil and flame retardant layers. It is used in buildings where both thermal protection and fire safety are required.
Building insulation must meet Euro ratings from A1 (non-combustible) to F (unrated), depending on where and how it is used.
Workwear for welders and industrial workers is treated with phosphorus-based agents that penetrate the fibers. The protection must last even after many washes, and the clothes must still be comfortable to wear.
Natural fibres such as cotton can be flame retarded using the Proban process, where a phosphorus-based agent is polymerized into the fibre itself. This provides protection that doesn't actually wash off.
Synthetic fibers such as polyester and nylon are chemically modified during production with flame retardants. Meta-aramid (Nomex) and para-aramid (Kevlar) are examples of fibers that are already flame retardant from the start.
Furniture fabrics in environments such as hotels, hospitals and trains are treated to meet high fire requirements. Often a backcoating technique is used where the flame retardant is added to the back of the fabric.
Curtains and drapes are sometimes flame-retarded by dipping them in water-soluble agents. However, this protection needs to be renewed at regular intervals.
Why Choose Light Workwear for Summer? Heavy workwear in the heat? No thanks. It can...
What is workwear for welders? Workwear for welders is specially designed protective clothing. They are...
What Does Arc Protection Classification Mean? Arc protection classification defines how well protective clothing can...
Portwest
PW3 Modaflame Knit HVO FR Long Sleeve Polo Shirt
Portwest
PW3 Modaflame Knit FR Long Sleeve Polo Shirt
Portwest
PW3 Modaflame Knit FR Long Sleeve T-Shirt
Portwest
Modaflame Knit FR Long Sleeve T-Shirt
Portwest
PW3 Modaflame Rain+ Hi-Vis Multi-Norm FR Winter Trousers
Portwest
PW3 Modaflame Work Hi-Vis Multi-Norm FR Bib and Brace
Portwest
Portwest
Flame retardant materials are used where fire safety is a must - to protect both people and gadgets. Construction, electronics and transportation are among the biggest areas where these materials really make a difference.
Structural fire protection is the big thing when it comes to flame retardant materials in construction. They are used to strengthen the fire resistance of key elements such as columns, beams and walls.
It's all about preventing the spread of fire and the collapse of the building if it catches fire. Different materials require different methods.
Wood is often treated with special coatings or impregnated with chemicals that make it harder to ignite. Steel, on the other hand, is given special protective layers that prevent it from weakening when temperatures soar.
Flame-retardant insulation materials also play a fairly central role in fire protection. They must pass Swedish tests to be used.
Flame retardant sprays, coatings and special boards are often seen in areas where the risk is particularly high.
Electronic gadgets and electrical equipment need flame retardants to prevent them from catching fire if something goes wrong. Flame-retardant plastics are used in circuit boards, connectors and housings to hold back fire and smoke.
Cables and wires are often filled with flame retardant fibers. This prevents overvoltages from causing large fires.
Insulation materials in transformers and high-voltage parts also get a dose of flame retardant. That's so they don't become a hazard, even when pushed to the limit.
In the automotive industry, flame retardancy is almost a given. It's about protecting both people and goods.
Public transport, such as buses and trains, must use flame retardant fabrics in seats and interiors. There are quite strict rules for that.
Flame retardant rubber is seen in everything from tires to seals. They have to withstand heat, ozone, UV and corrosion, and still keep the fire out.
Workwear for transport workers is often made of fibers like aramid and modacrylic. They hardly burn and do not lose their protection, even after a long time.
Such clothing is actually very important for anyone working with fuel or in hazardous environments.
Flame retardants are a diverse collection of chemicals, and there are both advantages and disadvantages to them. Bromine-based and phosphorus-based variants are the most common, but regulations are getting tougher all the time.
Bromine-based flame retardants are the most common, with around 70 different types used in electronics and plastics. They work by releasing bromine radicals when heated, which stops combustion.
Polybrominated diphenyl ethers (PBDEs ) and tetrabromobisphenol A (TBBPA ) are well-known examples. Phosphorus-based agents are growing in popularity and are often considered a little kinder to the environment.
They form a protective layer of carbon or glass on the surface. Phytic acid and metal phytates are interesting options for cellulose-based materials.
Chlorine-based flame retardants are mostly used in construction and insulation. Aluminum hydroxide and magnesium hydroxide are mineral-based and release water vapor when heated, cooling and diluting combustible gases.
Bromine-based flame retardants can be stored in fatty tissue and disrupt hormonal balance. PBDEs have been linked to neurological problems in children and thyroid effects.
They break down slowly and accumulate in the food chain. Some flame retardants are classified as phase-out substances due to their hazardous properties.
Exposure is mostly via dust from things like furniture, textiles and electronics. People working in welding, construction or electronics are particularly at risk.
Environmental impact? Yes, soil and water contamination and impacts on animals are well known. Bromine-based substances have been found in breast milk and blood serum worldwide.
EU REACH legislation controls the use of hazardous flame retardants. The RoHS Directive sets limits for certain substances in electronics, while the WEEE Directive deals with the recycling of electronic waste.
The Swedish Chemicals Agency monitors flame retardant products in Sweden and can stop products containing prohibited substances. The Swedish Work Environment Authority (Arbetsmiljöverket) has rules on exposure, especially for protective clothing and industrial textiles.
The POPs Regulation bans certain persistent organic pollutants, including several bromine-based flame retardants. The UL-94 standard requires flame retardant materials to pass specific fire tests, often V-0 class at 15-30% addition.
What are Flame-Resistant Garments? Flame-resistant garments are workwear designed to protect the wearer from heat, flames, and arc flashes in hazardous environments. They are made from materials that are either...
Jesper Adolfsson |
What is Heat Stress and Its Warning Signs? Heat stress can arise when the body cannot maintain temperature control in hot environments. It can quickly worsen if the signals are...
Jesper Adolfsson |
Key factors for sustainable workwear Material selection, safety and long-term sustainability have an impact on both the environment and the company's finances. These are the factors that determine the quality...
Filip Edvinsson |
Managing fire risk in a smart way requires both good materials and procedures. Everything must work together to create a safe working environment.
The first step is to identify and remove potential fire sources. Risk analysis helps companies identify where there is a risk of high temperatures, open flames or sparks.
Welding rooms and heavy industrial environments require extra vigilance. Workers there are often exposed to heat and sparks.
Preventive measures can include
Workplaces are often divided into different zones to separate hazardous and sensitive areas.
Choosing the right materials is crucial for fire safety. Flame-retardant materials in workwear and protective equipment can make a real difference in the event of an accident.
Thermoplastics can catch fire quickly, but many modern plastics are flame retardant or self-extinguishing. They are suitable where fire protection is a must.
Workwear materials are tested and certified according to Swedish standards:
| Material type | Fire properties | Area of use |
|---|---|---|
| Inherently flame retardant | Permanent protection | Petrochemical, electrical industry |
| Materials treated | Chemical impregnation | Welding, industrial |
| Natural fibers | Limited flame spread | Easier hazardous work |
The right choice of materials can also protect property and keep your business running. Materials that resist fire reduce the risk of damage and disruption.
Regular maintenance is important to keep flame retardants working over time. Work clothes and protective equipment need to be washed properly in order not to lose their protective effect.
Washing instructions must be followed carefully. Some flame retardants can disappear if mishandled and dry cleaning can sometimes damage the material.
Safety procedures usually include documentation of:
Companies should also have procedures to monitor fire safety. This includes regular risk assessments and adjusting procedures when something changes.
Documenting everything systematically makes it easier to keep track of when it is time to replace protective equipment.
Flame retardant materials are covered by a number of standards from ISO, ASTM and NFPA. Fire classification is done according to different systems where materials are assessed based on how they perform in a fire.
EN ISO 11612 is the main European standard for protective clothing against heat and flame. It requires clothing to resist flame spread, either via surface ignition (A1) or both surface and edge (A2).
NFPA 2112 and NFPA 2113 apply to flame-resistant garments for short-term heat exposure. One sets the performance requirements, the other addresses selection, use and maintenance.
International ISO standards and American ASTM standards test the resistance of textiles to fire using carefully controlled methods. This involves measuring how quickly they extinguish, how well they resist fire and how much they char.
The tests involve exposing the material to open flames under specific conditions. The results then determine the classification of the material and where it is suitable for use.
Flame retardant materials are classified according to the Euroclass system. It ranges from A1 (non-combustible) to F (no performance determined).
The B classes look like this:
Marking indicates the fire performance and certified performance of the material. Certification marks from accredited bodies mean that the material meets safety requirements.
Building materials for fire protection must meet certain classification requirements depending on their intended use. Industrial protective clothing has its own labels showing the level of protection and intended use.
The Fire Protection Association produces guidelines on how fire protection materials are used in industry. They also provide recommendations on how to actually implement flame retardant solutions.
The Swedish Chemicals Agency monitors flame retardants in Sweden and ensures that environmentally hazardous substances are regulated. They also review endocrine disruptors in products.
Accredited verification bodies according to ISO/IEC 17029 make independent assessments of whether the material meets the rules. They make sure that products really deliver what they promise in terms of safety standards.
International organizations such as the National Fire Protection Association ( NFPA ) set global guidelines for fire protection. Their standards are used worldwide to create uniform levels of safety, both for materials and protective clothing.
There is a lot going on in the development of flame retardant materials. Researchers are looking for environmentally friendly alternatives that do not contain hazardous substances, and technology is advancing rapidly.
Right now, there is a lot of focus on halogen-free flame retardants and nanostructured materials. It may sound a bit science fiction, but it's actually real.
Halogen-free flame retardants seem to be the future. They reduce smoke and the release of toxic gases in case of fire - quite important in, for example, car interiors, electrical cables and building materials.
Advantages of halogen-free solutions:
The DESIDERATA project is testing frameworks to develop alternatives to hazardous substances. Research is trying to find substitutes that still provide good fire protection.
Cellulose-based materials and environmentally friendly flame retardants are also being tested. Biodegradable alternatives still seem quite promising.
Nanostructured additives are a game changer - they improve performance even at low concentrations. RISE is developing new additives for plastics and materials that do not even need additional flame retardants.
Research areas that are hot:
The Wallenberg Foundation's WISE program invests in materials research for a sustainable future. Uppsala University is helping to develop new solutions for the next generation of flame retardants.
Combined analytical methods provide better insight into how materials break down at the molecular level. This opens the way for flame-retardant materials that can be tailored for workwear and industrial protection, for example.
It's no wonder people wonder about flame retardant materials - safety, performance, environmental impact... there's a lot to think about.
Textiles are treated with different types of flame retardants depending on their material and use. Halogenated substances, such as brominated and chlorinated chemicals, are often used in synthetic fibers to slow down ignition.
Cotton and natural fibers most often receive phosphate-based flame retardants. They work by creating a protective surface when it gets hot.
Intumescent flame retardants swell when heated and form an insulating layer. They are particularly used in workwear for harsh environments such as welding.
Testing follows standardized methods that measure how the material behaves in a fire. Parameters such as flame burning time and flameless burning time are important to assess performance.
Vertical fire tests involve exposing the material to a controlled flame for a certain time. It is then checked how quickly the material extinguishes itself and how far the fire spreads.
LOI (limited oxygen input) tests measure the minimum oxygen content required to keep the material burning. The higher the LOI value, the better the flame retardancy.
Intrinsic flame retardant materials have the fire protection built into the fiber itself when it is manufactured. So it doesn't come off, even after a lot of wear and tear or washing.
Treated materials get their protection through chemical treatment after they are made. This can be dipping, spraying or impregnation.
Intrinsic materials retain protection for the life of the product. Treated materials may lose their effect after washing or long use.
It actually depends on the type of material and treatment. Inherently flame retardant fibers can withstand repeated washing without losing their properties.
Treated materials are more sensitive and need special care to keep their protection. Gentle washing, no bleach, and avoiding high heat when drying - these are good tips.
Workwear with flame retardants often requires special washing according to the manufacturer's instructions. Home laundry can actually remove the protection from treated materials.
Some flame retardants are classified as hazardous to health and the environment by authorities. Brominated substances, in particular, can accumulate in the environment and degrade poorly.
Old flame retardants can spread far through air and water, and they have long-lasting effects on animals and ecosystems.
However, things are moving in the right direction - industry is trying to replace problematic chemicals with phosphate-based and natural alternatives.
Exposure to flame retardants can happen through inhalation of dust. It can also happen through direct contact with treated materials.
Some older flame retardants are suspected of being endocrine disruptors. They can affect reproductive health, which of course worries many people.
Brominated flame retardants can accumulate in the body's fatty tissues over time. In fact, studies show elevated levels of these substances in people who work with flame retardant materials regularly.
Modern flame retardants today undergo extensive safety testing before they are approved for commercial use. New regulations in the EU and other regions restrict the use of the most problematic substances.
The information on this page is intended as general guidance only and does not replace manufacturer instructions or applicable regulations. Workwise does not guarantee that the content is accurate, complete, or current and is not liable for decisions or actions taken based on this information. Always follow current standards and manufacturer instructions.