Let’s take a look at inherently fire-resistant fabrics. Before we start, it’s important to note that no fabric is fireproof; given enough time, it will burn. That being said, some materials out there resist fire more than others. For example, we all know that cotton burns easily and rapidly. However, wool and Kevlar inherently resist flames because of the fiber's structure. A tightly woven wool fabric will take longer to burn than cotton or linen.
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Inherent vs. Treated
The first thing you should know about fire retardant fabrics is that there are two main types: Inherently or Chemically Treated. A fabric is inherently or chemically flame retardant, which matters when it comes to what you’re using the fabric for and how long you want it to last. Over time you can wash out chemicals, but if you take care of your fabric, it can last a long time. Remember, some fabrics are naturally more resistant to catching fire than others. Like tightly woven wool takes longer to burn than cotton.
Inherently fire-retardant fabrics are excellent for use in your home, especially for things like curtains and drapes. (This is one way to protect your home and family from fire and chemically treated materials). These fabrics can also be used in tents, health care fabrics, drapes, tarps, military applications, awnings, banners, and signs.
Finding the proper manufacturer for your fire retardant project/product is essential, especially when considering chemically treated fire retardant fabrics. That’s why Herculite Inc. offers customers a variety of products that are not only fire retardant but meets the National Fire Protection Association standards.
The NFPA is the world’s leading advocate of fire prevention and an authoritative source on public safety; NFPA develops, publishes, and disseminates more than 300 consensus codes and standards.
The application of flame-retardant fabrics is far-reaching. For example, Herculite Inc. offers the Sure-Chek® high-performance fire barrier fabric. The Sure-Chek® fire barrier fabric is flame resistant and self-extinguishes when removing a source flame. These products are manufactured and tested by accepted industry standards.
Additionally, Herculite offers an ultra-high fire barrier fabric Sure-Chek® Blaze Blocker HP, an open-flame barrier fabric. This inner liner fabric enables mattresses to pass the California Technical Bulletin 129, Boston Fire Code 9-XII (full-scale open flame, complete mattress burn tests). Sure-Chek® Blaze Blocker HP also passes California Technical Bulletin 133 (full-scale open flame, full chair burn test).
Herculite’s awning composite textiles are also excellent examples of an inherently flame [C1] retardant fabric (PVC composite) with practical uses. Some municipalities will mandate fire-resistant awning fabrics, and checking ahead will reduce potential project delays.
Where are flame-retardant fabrics used?
Flame-retardant textiles are used in various applications where fire safety is critical. These textiles are designed to resist ignition, delay flame spread, and limit the extent of burning when exposed to a fire or heat source. Here are some common uses of flame-retardant textiles:
- Protective Clothing: Flame-retardant textiles are widely used in protective clothing for workers in industries with a risk of fire or exposure to heat. This includes firefighters' gear and industrial workers in oil and gas, welding, chemical processing, and electrical industries. Flame-resistant clothing provides additional protection, reducing the risk of burns and injuries in fire incidents.
- Upholstery and Furnishings: Flame-retardant textiles are used in upholstery and furnishings for homes, offices, and public spaces. This includes furniture upholstery, curtains, drapes, carpets, and bedding. These textiles help enhance the fire safety of these products, reducing the potential for rapid flame spread and contributing to overall building safety.
- Transportation Industry: Flame-retardant textiles are utilized in the transportation industry, including the automotive, aerospace, and railway sectors. They are used in the interior components of vehicles, such as seat covers, carpets, headliners, and insulation materials. Incorporating flame-retardant textiles can minimize the risk of fire incidents and the spread of flames in case of accidents or electrical malfunctions.
- Military and Defense Applications: Flame-retardant textiles are vital in military and defense applications. They are used in uniforms, combat gear, tents, sleeping bags, and other equipment to protect personnel from fire hazards during combat, training, or emergencies.
- Hospitality and Public Spaces: Flame-retardant textiles are commonly employed in hotels, restaurants, theaters, and other public spaces to comply with fire safety regulations. They are used in curtains, drapes, bedding, upholstery, and carpets to reduce the risk of fire incidents and ensure the safety of occupants. Even windows will need to be flame resistant.
- Medical and Healthcare: In medical environments, flame-retardant textiles are utilized in bedding, curtains, and drapes to enhance patient safety. These textiles help minimize the risk of fire accidents and contribute to maintaining a safe healthcare environment.
- Electrical and Electronics: Flame-retardant textiles find applications in the electrical and electronics industries. They are used as insulation materials, cable and wire coatings, and protective covers for electrical components to minimize the fire risk caused by electrical faults, short circuits, or overheating.
Flame-retardant textiles are crucial in various industries and settings where fire safety is paramount. They provide an added layer of protection, reduce the spread of flames, and allow more time for evacuation or fire suppression measures in emergencies.
What are some of the significant testing standards for flame-retardant textiles?
Flame standards for textiles refer to regulations and testing methods that determine the flammability characteristics of textile materials. These standards assess the fabric's resistance to ignition, flame spread, and other fire-related behaviors. Compliance with flame standards ensures that textiles meet specific safety requirements and reduce the risk of fire hazards. Here are some commonly used flame standards for materials:
- NFPA 701: The National Fire Protection Association (NFPA) 701 is a widely recognized standard in the United States for flame propagation of textiles and films. It addresses the fire behavior of fabrics used in curtains, draperies, and similar applications. The test evaluates the fabric's response to a small-scale flame and measures parameters such as ignition time, flame spread, and after-flame duration.
- ISO : This International Organization for Standardization (ISO) standard is known as the "vertical flame test" or "vertical strip test." It assesses the flame resistance of textiles when exposed to a small flame applied vertically. It measures after-flame, after-glow, and damage length to determine the fabric's performance.
- BS : The British Standard is a flame-retardant test method used in the United Kingdom. It assesses the ignition resistance of upholstery materials used in furniture, including fabrics, foams, and fillings. Part 1 covers ignition sources for a cigarette and match flames, while Part 2 addresses using a gas flame as an ignition source.
- DIN : The German standard DIN evaluates the fire behavior of materials, including textiles. Multiple classifications, such as B1, B2, and B3, indicate different flammability levels. B1 is the highest level, meaning a material that is difficult to ignite and has limited flame spread.
- AS/NZS : The Australian/New Zealand Standard assesses the fire performance of building materials, including textiles. It comprises two parts: Part 2 measures the flammability properties, such as ignition time, flame spread, and heat release rate, while Part 3 evaluates the spread of flame on external walls.
These are just a few examples of flame standards for textiles. Different countries may have national or regional standards that manufacturers and suppliers must comply with to ensure the safety of textile products. It is essential to consult the relevant standards and regulations applicable to your specific region or intended market to make sure it is in compliance.
So what have chemically treated fire retardant fabrics?
Well, they are fabrics that have been coated with a fire-resistant chemical. Today, there are more than 175 different types of flame retardants, according to the International Association of Certified Home Inspectors (InterNACHI). These chemical types are brominated, chlorinated, phosphorus-containing, nitrogen-containing, and inorganic flame retardants. Flame retardant chemicals are also known as PBDEs or polybrominated diphenyl ethers.
Keep in mind that PBDEs are chemical, and you might have questions about their safety. Visit the Center for Disease Control’s Agency for Toxic Substances and Disease Registry’s Web site for more information at: http://www.atsdr.cdc.gov/toxfaqs/tf.asp?id=900&tid=183.
If you buy a treated fabric, remember that the chemical starts to wear down as you wash and use it. Inherently fire retardant fabrics don’t suffer from this issue. You may also consider that adding an FR treatment to a material may void the manufacturer's warranty.
Understanding How Flame Resistant Fabrics Work
Flame resistant (FR) clothing is a foundational way to help keep your employees safe and protected from burns caused by flash fires, electric arcs and combustible dust. These hazards can be especially prevalent in many different industries and trades like:
- Oil and gas
- Electrical
- Welding
- Utilities
- Iron and steel
- Mining
Within each profession and industry, the legal requirements for safety workwear vary based on the duties each position entails. Because of these very specific requirements, there are distinct levels of flame resistance protection and a variety of FR fabrics available on the market.
FR Categories and Regulatory Guidelines
The National Fire Protection Association (NFPA) sets the standards and requirements that fire resistance garments must adhere to.
NFPA 70E Requirements
“Standard for Electrical Safety in the Workplace”, known as NFPA 70E, covers electrical safety requirements for workers, focusing on safeguards to remain productive within their respective job functions. The purpose of the standard is to provide “practical safeguarding of employees during activities such as the installation, operation, maintenance, and demolition of electric conductors, electric equipment, signaling and communications conductors.”
In short, NFPA 70E exists to protect electrical workers across all industries who work on or near electricity or energized parts/equipment capable of generating an arc flash.
Complying with NFPA 70E
NFPA 70E is considered the most widely practiced, comprehensive standard for electrical safety in the workplace. Electrical worker FR clothing must comply with these standards, which establishes CAT categories that define the level of arc rating needed by clothing to perform specific hazardous tasks. The standard identifies the distinct types of fire protective clothing needed for specific types of work.
Some of the key garment tests to comply with 70E include:
- Threads must be from flame resistant fibers and not melt at 500°F
- When exposed to flame for 12 seconds, garments:
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- Must self-extinguish in 2 seconds or less after flame is removed
- Must not have char damage of more than 6 inches
- Must not melt or drip
- Must remain compliant to all these standards after 25 wash and dry cycles
NFPA Requirements
NFPA is the clothing standard for protection against flash fire hazards. This requirement is most commonly applicable to non-electrical work found in oil and gas industries, but it does encompass all potential jobs where flash fire is considered a hazard.
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The purpose of NFPA is similar to 70E in that it exists to protect workers from burns caused by hazardous working conditions or materials in the workplace. It provides the minimum requirements “for the design, construction, evaluation, and verification of flame resistant garments for use by industrial personnel.” It intends to reduce burn injuries and the severity of burns for wearers.
The garment requirements laid out in NFPA are extremely stringent. FR clothing must tested and certified by a third party before being made available on the open market, and garments must defy melting, dripping, or after-flame burning, similar to 70E.
While FR garment designs do sometimes adhere to both standards, it is important to note that compliance with one standard does not mean compliance with the other.
Flame Resistance vs. Flame Retardant Fabrics
While “flame resistance” and “flame retardant” are terms sometimes used interchangeably, there are differences. Flame resistance refers to any fabric where fibers have a natural resistance to burning when exposed to flame. Wool, for example, is highly unlikely to fully ignite because any flames introduced to a wool garment tend to be naturally extinguished by the fibers themselves.
Flame retardant fabrics, on the other hand, are made up of fibers treated by chemicals to make them exceptionally resistant to fire. They can burn, but at a much slower rate than all other fabrics and with the added ability to extinguish themselves.
If a flame is removed from either of these garment types, the fabric will stop burning. This means it will not burn on its own and wearers of these fabrics will have added protection against ignition.
The Science Behind Flame Resistant Fabrics
Some of the leading clothing manufacturers we offer, like DRIFIRE® and SteelGuard®, design, test, and innovate FR clothing by using many types and blends of different fibers to make FR fabrics. Synthetic fibers continue to be a large portion of what comprises FR garments, but everyday fibers like cotton can also become flame resistant when flame retardant chemicals are added.
Nylon and polyester are both popular synthetic fibers that have fire resistant qualities. Plastic-based fibers (like nylon and polyester) tend to melt instead of burn, making them great for FR garment fabrics. Nylon and polyester are both popular materials used in FR clothing due to these high melting points and low thermal conductivity. Manufacturers often treat these synthetic fibers with a fire-resistant chemical for additional protection.
Aramid fibers are another type of synthetic fiber known for their resistance to high temperatures and corrosion. They are also extremely lightweight, yet high strength which make them an excellent fiber for usage in high-performance, FR fabrics. Aramid fibers are known for being stronger than steel at only a fifth the weight of steel.
Modacrylic are synthetic fibers known for their durability, comfort and protection. They have flame retardant qualities, but also are known to be comfortable due to low density of modacrylic fibers. These fibers can be easily dyed, shaped and are known to dry fast. As such, fabrics made with modacrylic fibers are commonly used in performance FR clothing and other workwear.
Cotton, by nature, is not flame resistant. It is highly flammable. However, chemically-treated FR cotton is indeed flame resistant. FR cotton feels and performs much like cotton, but with the added protection against fire making it another common fabric found in FR clothing. Some garments are 100% cotton, yet the flame retardant chemicals make those same garments flame-resistant and able to comply with FR standards. Cotton and nylon fibers are often blended to form a popular flame resistant fabric option for FR clothing manufacturers.
Most FR fabrics are often a specific blend of these kinds of fibers coated with fire-resistant chemicals. The blend ratios and chemical treatments required depend on the application of the garment and which NFPA standards to which it needs to comply.
How Flame Resistant Fabrics Work
How do flame resistant fabrics work? Essentially, FR fabrics are made up of fibers that won’t ignite – often flame retardant fibers, but sometimes a mix of both flame retardant and naturally flame resistant fibers. With all these fibers, both synthetic and natural, FR clothing manufacturers can mix and match different blends to create new and innovative fabrics that increase protection and garment performance, like enhanced moisture wicking, comfort, air flow or durability.
The properties of these fabrics tend to perform well to meet various standard measurements, including:
Self-extinguishing – Garments should extinguish themselves after 12 seconds of flame exposure.
Charring – Most FR fabrics should char (but not burn), which acts to eliminate the fire’s fuel while helping to block the heat from the fire.
Insulating properties – In certain workplace environments, insulating properties are needed to assess how well a garment can protect the wearer from the heat of flames as well as protection in freezing temperatures.
Caring for FR Clothing
FR garments require special safety and care considerations to help the distinct types of FR fabrics retain their flame retardance. NFPA 70E standards state that garments should keep all their FR properties after 25 washes (and dries). But this is only possible if FR clothing is meticulously cleaned. Proper laundering and maintenance are necessary for FR clothing and critical for extending the longevity of the garments so that they keep you and your team safe.
Soils and stains MUST be removed entirely before FR clothing can be used in the field. A small oil stain on your flame resistant coveralls, for example, increases the risk of garment ignition. FR garments must also remain free and clear of other safety-compromising contaminants, like soap residue or calcium and magnesium salt build-up that can build up through washing or hard water.
Proper cleaning of FR garments is a bit more complicated than your standard cotton or polyester clothing items, but a uniform rental service can remove these challenges, shifting the responsibility of cleaning from your team to an experienced professional with established cleaning processes and protocols for FR fabrics.
Benefits of Flame Resistant Uniforms from Vestis
A Vestis uniform rental program helps businesses just like yours save time and money while alleviating the challenges of cleaning, maintaining and managing critical safety apparel. Leveraging a uniform rental program, businesses can improve safety, ensure regulatory compliance and gain peace of mind knowing that all the routine maintenance and upkeep are handled by FR clothing professionals. Read more about the benefits of renting FR clothing and uniforms.
FR Clothing from Vestis
From superior fire protection to enhanced comfort and mobility, Vestis is proud to offer several FR clothing options from the industry’s top manufacturers. We are also the exclusive industrial laundry provider of rental DRIFIRE FR rental garments, a proven leader in the FR industry.
Along the way, we help ensure your facility remains compliant with all the statutory requirements related to flame resistant clothing based on your company’s protection needs. Here is how our FR uniform rental program works:
If you want to learn more, please visit our website Flame Retardant Knit Fabric.