1 – Introduction
2 – Essential Features of a Firefighter's Suit
3 – Flame-Resistant vs. Fire-Retardant Clothing: What's the Difference?
4 – Flame-Resistant Thread
5 – Flame-Resistant Fabrics, Treated Textiles, and Care Guidelines
6 – Examples of Flame-Resistant Fabrics and Chemical Compositions (Aramid + Nomex)
7 – Firefighter Suits
8 – Testing Standards for Flame-Resistant Fabrics
Introduction
A firefighter is a highly trained rescue professional whose primary responsibility is to combat dangerous fires that threaten lives, property, and the environment. Beyond extinguishing flames, firefighters are also trained to rescue people and animals from hazardous situations.
In many countries, firefighters are often considered unsung heroes despite their crucial role in safeguarding civilian property. They play a significant part in protecting critical infrastructure that is particularly vulnerable to fire hazards, such as petroleum companies—where safety must be a top priority—as well as airports, by employing the latest fire suppression technologies, and even systems that can predict fires before they occur.
Firefighters work closely with other emergency services, including police and emergency medical responders. In some cases, their roles overlap. For instance, firefighters investigate the cause of a fire, and if arson or negligence is suspected, their work intersects with law enforcement. Additionally, firefighters frequently provide basic emergency medical care alongside full-time paramedics.
The increasing complexity of modern industrial life, combined with the growing scale of hazards, has driven the evolution of firefighting techniques and expanded the scope of firefighters' responsibilities. Today, firefighting units are deployed worldwide—in wilderness areas, urban zones, and even aboard ships.
The core duties of firefighters include fire suppression, rescue operations, fire prevention, basic first aid, and fire investigation.
In this research paper, we will examine the challenges associated with firefighter protective clothing and propose practical solutions to address them.
Challenges Firefighters Face in the Line of Duty
Burn Injuries:
This risk can be mitigated through the use of chemically treated flame-retardant fabrics or textiles woven from inherently fire-resistant fibers.
Heat Stress:
Heat stress is a major concern for firefighters because they wear insulated garments that prevent the body from releasing heat generated during physical exertion. This issue can be addressed through woven cotton layers that block external liquids from penetrating while regulating body temperature. Additionally, physiological monitoring systems can alert teams within 10 to 20 seconds after a firefighter stops moving. These monitors track vital signs, fatigue levels, and exertion, transmitting data via radio communication.
Increased Cancer Risk Among Firefighters:
A 2015 study revealed that firefighters face a significantly higher risk of developing cancer. Research showed that firefighters are more susceptible to mesothelioma—a lung cancer caused by asbestos exposure, a material historically used in firefighting garments in some countries to provide heat resistance. Their incidence rate was found to be double that of the general non-firefighting population. Younger firefighters (under 65) also developed bladder and prostate cancer at rates exceeding those of the general public. The initial 2015 research on a large cohort of American firefighters established a direct correlation between the number of hours spent fighting fires and lung cancer, leukemia mortality rates, and overall cancer mortality among firefighters.
Essential Things to Know About a Firefighter's Suit
Maintenance Requirements:
Chemically treated fabrics retain their flame-resistant properties for only a limited number of months. There are also strict washing guidelines for flame-resistant clothing. These guidelines require checking the care label and following the manufacturer's recommendations for proper care and maintenance.
Cost:
Fire-retardant clothing is generally less expensive than inherently flame-resistant clothing, and each type is selected based on the specific needs of the user.
Protection Level:
When it comes to protection levels, all types of flame-resistant clothing come with a label indicating the degree of protection offered. The National Fire Protection Agency (NFPA) has developed a chart to help workers determine the level of protection required for their specific job. Flame-resistant garments are labeled with their respective hazard category classification.
Comfort:
Comfort is a critical factor when selecting a protective suit. Oversized suits can hinder movement and reduce the wearer's speed and agility. The best flame-resistant clothing should not only protect against hazards but also be comfortable to wear. Comfort levels vary depending on the brand, fit, materials, and numerous other factors.
Flame-resistant clothing once had a reputation for being hot and bulky. This was because early options were limited and the technology was not yet advanced. Today, manufacturers have the capability to produce soft, lightweight fabrics that still provide adequate protection.
Flame-Resistant vs. Fire-Retardant Clothing: Understanding the Difference
The most significant difference between flame-resistant and fire-retardant fabrics lies in how each one is manufactured.
Flame-Resistant Fabrics:
These are made from materials that are inherently non-flammable. The flame resistance is built into their chemical structure. Fabrics made from these materials are designed to prevent the spread of fire and will not melt or drip when exposed to flames. Since flame-resistant fabrics are not typically made from 100% fireproof materials, they will burn—but extremely slowly—and are often self-extinguishing.
Fire-Retardant Fabrics:
These are chemically treated to be slow-burning or self-extinguishing when exposed to an open flame. These fabrics can be manufactured from any material but must be treated with special chemicals to qualify as fire-retardant. If a fire-retardant material catches fire, the flames will struggle to sustain themselves, and the material will ultimately extinguish the fire.
📊 Flame-Resistant vs. Fire-Retardant — At a Glance
| Feature | Flame-Resistant (FR) | Fire-Retardant |
|---|---|---|
| How It Works | Inherently built into fiber chemistry | Chemical treatment applied to fabric |
| Durability of Protection | Permanent — lasts the life of the garment | Degrades over time with washing/wear |
| Cost | Higher initial cost | Lower initial cost |
| Common Materials | Nomex, Kevlar, Modacrylic | Treated Cotton, Cotton-Nylon blends |
| Melting Behavior | Will not melt or drip | Depends on base material |
| Self-Extinguishing | Yes — inherently | Yes — through chemical treatment |
Flame-Resistant Fabric
Although no fabric is completely fireproof, some textiles resist fire far more effectively than others. Flame-resistant fabric—also known as fire-resistant fabric—is classified based on how long it takes for the material to burn. A fire-resistant fabric may be naturally resistant due to the weave of its natural fibers, or it may be chemically treated with a flame-retardant compound to withstand heat and flame.
Flame-Resistant Fibers: What Are Treated Fibers?
Treated fibers are those that contain a flame-retardant chemical applied during the fiber formation process, making the fibers flame-resistant. The flame-retardant chemical cannot be removed through normal wear or washing. The garment will only lose its flame-resistant properties if it becomes severely torn or excessively contaminated.
Wool:
Wool is generally considered the most flame-resistant natural fiber because it is difficult to ignite and its flames are often self-extinguishing. While natural fibers like silk, cotton, and wool are more susceptible to fire than synthetic fibers, fabric manufacturing techniques can significantly enhance their fire resistance. Natural fibers can also be treated with chemical solutions that improve their flame resistance.
Vermiculite-Coated Fiberglass Fabric
Acrylic, Polyester, and Nylon:
Fabrics made from acrylic, polyester, and nylon can be hazardous when they burn because these materials can melt and cause severe skin burns when used in clothing. Despite this, these synthetic textiles are considered fire-resistant fabrics because they resist ignition at significantly higher temperatures than natural fibers. Synthetic materials can also be chemically treated to further increase their ability to withstand extreme heat.
Cotton and Modacrylic Fibers:
Fabrics made from this blend feature fibers that are soft and comfortable like cotton, yet strong and durable like modacrylic fibers. They are also resistant to chemicals and solvents, making this combination ideal for flame-resistant applications.
Kevlar and Nomex:
Strong, heat-resistant aramid fibers like those found in Kevlar fabrics are inherently fire-resistant—more so than any other type of fabric. They are frequently used to manufacture heat-resistant gloves and protective garments for firefighters.
Kevlar Fibers
Flame-Resistant Thread:
- PTFE-Coated Fiberglass Thread:
PTFE-coated fiberglass thread is manufactured from continuous fiberglass filaments that are heat-resistant, chemically resistant, and exceptionally strong. The fiberglass is also coated with a PTFE layer—commonly known as Teflon™—to improve stitchability and reduce friction. It can withstand operating temperatures of up to approximately 1,022°F (550°C). It is important to note that the PTFE coating burns at 620°F (320°C). This means the coating will propagate flame, but the fiberglass itself will maintain greater heat resistance.
- Fire Suit Sewing Thread (Fire Retardant):
It may look like cotton thread, but it is actually Nomex or Kevlar wrapped around a cotton core. It does not melt and decomposes at 700°F.
Flame-Resistant Fabric: What Is Treated Fabric?
Treated fabrics are those that have a flame-retardant chemical applied to make them fire-resistant. The fibers used in these fabrics are not inherently protective; they become flame-resistant through chemical treatment.
The fibers used in these fabrics are typically 100% cotton or a cotton-nylon blend. Fabrics made solely from cotton fibers offer limited abrasion resistance. Adding nylon fibers to cotton creates a more durable and abrasion-resistant fabric.
Comparison Between Treated and Untreated Cotton Fabric Against Ignition
What Are Inherent Fabrics and Fibers?
Inherent fabrics and fibers do not require chemical treatment—they are naturally flame-resistant. The flame-resistant property is a fundamental characteristic of their fiber chemistry. Inherent fabrics and fibers do not lose their flame-resistant properties through normal wear or washing. The garment will maintain its flame-resistant characteristics throughout its entire service life.
Modacrylic fibers are the most popular inherent fibers and are used in blends with other flame-resistant fibers. They are often combined in varying proportions with lyocell fibers, semi-aramid, or polyamide-imide to produce a durable fabric. Another popular inherent fiber used in clothing applications is Nomex, which is available as a standalone fiber or, more commonly, blended with Kevlar.
What Is FR (Flame-Resistant) Clothing? And What Is It Made Of?
FR clothing is designed not to ignite easily, protecting the wearer from injury caused by fire. Even when it does catch fire, it is engineered to self-extinguish. If you are exposed to a brief, intermittent flame while wearing FR garments and they catch fire, the fabric will naturally extinguish itself. This capability significantly reduces the risk of burn injuries and can provide the wearer with invaluable time to escape an unsafe environment.
Not all FR clothing is made from the same fabrics. There are numerous options available, and none is universally perfect. Each comes with different benefits and trade-offs. The most suitable fabric is selected based on specific requirements and the work environment. What keeps an employee safe in one setting may not be exactly what keeps another employee safe in a different setting.
Most FR clothing is made from fabrics that blend several different materials. These materials are often synthetic and have been carefully engineered to be self-extinguishing and slow to ignite.
Who Needs to Wear Flame-Resistant Clothing?
The Occupational Safety and Health Administration (OSHA) has established specific guidelines mandating flame-resistant clothing for any employee working in conditions where they may be exposed to flames, electrical arcs, heat, chemicals, flammable substances, or similar hazards—this is the standard uniform for firefighters. The use of garments made from rayon, nylon, polyester, or acetate is prohibited unless the employer can demonstrate that these materials have been appropriately treated to withstand the conditions an employee may encounter on the job. OSHA guidelines provide more detailed specifications on who must wear FR clothing.
Firefighter suits are made from Kevlar
What Should You Wear Under Your FR Clothing?
If FR clothing is designed to protect you from flames, heat, and similar environmental hazards, are there additional measures you can take to make the garments more effective? Conversely, are there any practices that should be avoided to prevent reducing their effectiveness?
The clothing you choose to wear underneath your FR garments has a significant impact on your safety and the effectiveness of the FR gear. When wearing FR clothing, you should always take care to wear only non-meltable fabrics underneath.
There are two primary reasons for this:
- It adds a second layer of FR protection. Even if the outer layer of your clothing is damaged or burned, you will still have a second layer to protect you. The insulating air layer between the two layers also adds an extra measure of protection.
- The extreme environments you may work in can be dangerous. Although the outer layer provides protection, the underlying layer may be affected by heat and begin to melt or overheat. In sufficiently extreme temperatures and conditions, these inner layers of clothing could ignite and cause serious injuries.
How to Shop for Flame-Resistant Clothing:
1. How Should FR Clothing Fit?
When it comes to FR clothing, the general rule is that a looser fit provides more protection. With a loose-fitting garment, there is an additional layer of air between you and the fabric, providing extra insulation against heat or flame you may encounter while wearing the clothing. If you were wearing skin-tight FR clothing, the flames would be directly against your skin. Even with clothing as a protective barrier, it is safer to allow an air cushion between the skin and the fabric.
However, this should not be taken as an invitation to purchase extremely oversized clothing—doing so could be disastrous. It is important to remember that overly loose clothing can easily snag on nearby objects and hazards, trap you and restrict your movement, or tear and leave you exposed to environmental dangers.
The best solution is to find the right balance: not too tight and not too loose. Garments should fit slightly loose but should not hang off your body to the point where they are at risk of catching on nearby objects.
When purchasing FR clothing, keep in mind that, like most garments, it will shrink slightly during the first few washes. With this in mind, you may want to purchase a size slightly larger than usual so the garment has room to shrink to the correct fit.
2. Are There Specific Designs for Women?
Some FR manufacturers produce designs specifically targeted at women, while others do not. However, there is no special need for gender-specific designs. The purpose of FR clothing is to provide protection, and this function works in exactly the same way regardless of whether the clothing is designed for men or women. Because of this—and because of the slightly loose nature of these garments—many FR clothing designs are gender-neutral.
How Long Does FR Clothing Last?
It is impossible to make a blanket statement regarding the lifespan of every piece of FR clothing. The service life of FR garments can be affected by several different factors, including the manufacturer, garment quality, the type of fabric used, how frequently the clothing is worn, and the amount of wear and tear it sustains.
Some types of FR clothing can last up to five years, while others will wear out and need replacement in less than nine months. You will know it is time to replace your FR clothing when it becomes damaged beyond repair, contaminated, or ceases to function properly.
Caring for Flame-Resistant Clothing:
1. How to Wash and Dry FR Clothing
For most FR garments, the cleaning process is fairly straightforward. Garments can be cleaned at home in a standard washing machine and dryer with any type of laundry detergent. However, it is important to use soft water, as hard water contains mineral salts that can leave insoluble deposits on the fabric. These deposits can ignite if exposed to an ignition source, negating the flame-resistant properties of the clothing. It is also not recommended to use chlorine bleach or fabric softener, as these products will weaken the fabric.
Most FR clothing contains at least a small percentage of cotton, which means it is prone to shrinkage during the first few washes. If you are concerned about shrinkage, you can help prevent it by hanging items to dry on a drying rack instead of putting them through the dryer.
Repeated washing is perfectly acceptable because most FR clothing is designed to be durable and withstand significant wear and tear. Therefore, a few trips through the washing machine are unlikely to cause damage.
2. Can You Dry Clean FR Clothing?
Yes. You can dry clean FR clothing without any adverse effects. Since you can wash it at home using a standard washing machine, there is no special need for dry cleaning.
Examples of Flame-Resistant Fabrics
In this research, we will discuss the materials and treatments necessary to protect firefighters from the hazards they face. Significant efforts have been made in recent years to improve the suitability and effectiveness of firefighter clothing. These efforts have been directed toward protecting the wearer from the harsh environments that can lead to burn injuries or death. This paper examines the treatment of fabrics used in fire suppression and also explores asbestos-free alternatives that are fire-resistant, aimed at protecting workers from long-term cancer risks.
First: Fabric Treatment
Flame-resistant materials are self-extinguishing. Unlike conventional fabrics, they will not fuel a fire. Instead, they starve the fire by blocking the entry of oxygen.
Types of Flame-Resistant Fabrics
Naturally Resistant Fabrics:
Some manufacturers produce products that are naturally flame-resistant and require no chemical treatment. Natural fibers such as wool and silk typically do not melt and are difficult to ignite. The tighter and heavier the wool weave, the more fire-resistant it becomes. One key advantage of inherently flame-resistant fabrics is that they are designed to remain fire-resistant indefinitely. Since the resistance properties are built in at the molecular level, the garments remain flame-resistant regardless of their age or how long they have been in service.
Natural or Synthetic Fabrics That Can Be Treated for Resistance:
Other natural fabrics, such as linen and cotton, can ignite easily and lead to rapid flame spread. However, they can be treated with chemicals that will extinguish the flame. Research focused on firefighter protection has tested the comparative effectiveness of two flame-retardant compounds:
1- PF — phosphorus/nitrogen compound based
2- PR 20 — organo-phosphorus based
Fire tests were conducted on fabric samples both before and after washing them with soap in an electric washing machine. The treatment was carried out using three different types of firefighter clothing fabrics: 100% cotton, 100% polyester, and 50% cotton + 50% polyester. Both treated and untreated fabrics were tested using multiple testing methods: first, flammability testing; second, physical properties and comfort characteristics; and finally, thermal conductivity.
The fabric was analyzed before and after treatment using infrared spectroscopy to demonstrate the effect of the treatment on the fabrics. Results showed that firefighter garments treated with the first compound were more fire-resistant and performed better after washing, as the treatment remained stable within the fibers and retained its effectiveness even after repeated cleaning.
Flame-resistant clothing refers to any garments that have been specifically designed and manufactured to protect the wearer from potential flame and heat exposure. These garments will not ignite easily, and even when they do, they are designed to self-extinguish. If you are exposed to a brief, intermittent flame while wearing FR clothing and your garment catches fire, it will naturally extinguish itself. This capability significantly reduces the risk of burn injuries and can often provide the wearer with precious time to escape an unsafe environment. These features work together to offer a much greater chance of escape and survival if the wearer suddenly finds themselves in the midst of a flash fire, electrical arc, or other unexpected thermal emergency that could cause injury. In such situations, flame-resistant clothing can be the difference between sustaining serious injuries and escaping unharmed.
One drawback of chemically treated fabrics is that their protective properties will degrade over time, offering diminishing protection. Another concern is that the chemical treatments applied to fabrics like cotton can have negative environmental impacts. For example, the liquid byproducts of the treatment process can find their way into the environment and cause contamination.
📊 Comparison of Common Flame-Resistant Fibers
| Fiber / Fabric | Type | Max Temperature | Key Advantages |
|---|---|---|---|
| Nomex | Inherent (Aramid) | 370°C (700°F) | Lightweight, durable, self-extinguishing |
| Kevlar | Inherent (Aramid) | 427°C (800°F) | Extremely high tensile strength, cut-resistant |
| Modacrylic | Inherent | 275°C (527°F) | Soft, comfortable, blends well with cotton |
| Treated Cotton | Chemically Treated | 260°C (500°F) | Affordable, breathable, comfortable |
| Fiberglass | Inherent | 550°C (1,022°F) | Highest heat resistance, used in threads |
| Wool | Naturally Resistant | 230°C (446°F) | Self-extinguishing, no dripping, natural |
Synthetic Flame-Resistant Fabrics:
Aramid is a family of aromatic nylon that includes Nomex and Kevlar. A blend of Nomex and Kevlar is used to manufacture fire-resistant clothing, and this combination works effectively to protect firefighters.
Amide groups attach to opposing phenyl rings at carbons 1 and 4 in the case of Kevlar
Amide groups attach to opposing phenyl rings at carbons 1 and 3 in the case of Nomex
The parallel alignment of chains with one another is what gives aramids their tremendous tensile strength in addition to high melting points—both desirable qualities, even if they come at a premium cost.
The Firefighter Suit
Flame-Resistant Protective Suits
Flame-resistant (formerly known as flame-retardant) clothing is a specialized piece of personal protective equipment (PPE) designed to protect against flames and radiant heat, required in numerous workplaces.
Flame-resistant clothing is used in professions where workers may be exposed to various hazards, such as fire, explosions, or contact with electrical equipment, including:
- Electricians
- Electrical facility repair and maintenance workers
- Pharmaceutical and chemical industry workers
- Most importantly and most dangerously—firefighters. Below, we will study firefighter protective clothing in detail.
The Firefighter Suit:
The firefighter suit is designed to provide the wearer with protection from radiant heat and flames. It is manufactured from treated, flame-resistant materials. Flame-resistant clothing works through self-extinguishing mechanisms—the materials are self-extinguishing and work by starving the fire of oxygen, preventing it from passing through.
Some materials are naturally flame-resistant, such as wool and silk—they do not melt and are difficult to ignite, making them good candidates for FR equipment. The tighter and heavier the wool, the more fire-resistant it becomes.
Some synthetic fibers, such as polyester and nylon, are also difficult to ignite; however, once they catch fire, they tend to melt.
Other natural fabrics, such as linen and cotton, can ignite easily and lead to rapid flame spread, but they can be treated with chemicals that will extinguish the flame.
Firefighter Equipment
- Breathing Apparatus
- Fire Suit and Accessories
Self-Contained Breathing Apparatus (SCBA) with Air Cylinder
Components of the apparatus — Face Mask consisting of:
- Flexible hose
- Pressure valve
- Air exhaust valve
- Nose guard
- Lenses
- Sound transmission diaphragm
- Regulator
- Compressed air cylinders
- Back harness straps for securing
SOLAS Requirements for the Breathing Apparatus:
- Must be a self-contained system operating on compressed air
- Air cylinders must be easily replaceable
- Minimum compressed air volume of 1,200 liters, or sufficient for breathing
- Duration of no less than 30 minutes
The Fire Suit
Components:
- Tall boots
- Gloves
- Helmet
- Fire suit
- Safety rope
- Insulated-handle fire axe
- Safety lamp
SOLAS Requirements for the Fire Suit:
- The suit must be made from a material that protects the wearer from heat and smoke and must be waterproof
- The helmet must be certified to protect the head from impact
- Boots and gloves must be made from a non-heat-conducting material
- The safety lamp must operate for no less than 3 hours
- On petroleum tankers, the safety lamp must be explosion-proof
- The fire axe handle must be made from an electrically insulating material
- The rescue rope must be no shorter than 30 meters
- The rescue rope must be fire-resistant
- The rescue rope must withstand a load of up to 5.3 kilonewtons for no less than 5 minutes
- The rescue rope is attached to the fire suit via a sliding clip
Types of Fire Suits
- Proximity Suit
- Entry Suit
1- Proximity Suit
- The outer layer is made from heat-reflective material (reflecting approximately 90% of radiant heat)
- Used in active firefighting operations
- Typically deployed in liquid and gas fires that produce extremely high temperatures
2- Entry Suit
- Constructed from 9 layers of insulated fiberglass material
- Between each pair of layers is heat-reflective aluminum, which also forms the outermost layer of the suit
- Protects the wearer against temperatures up to 815°C (1,499°F)
- The visor lens is made from a special heat-reflective, smoke-proof material
- The hood is secured with adhesive strips to prevent it from falling off
- Used in situations where rescuing persons or performing tasks—such as shutting off a fuel valve—requires walking directly through fire
Fire Suit Specifications
- The suit must pass endurance tests requiring it to withstand 260°C (500°F) for 5 minutes before charring
- It must consist of two pieces—a coat and trousers—although a one-piece design may be acceptable provided it meets the same specifications
- Suits are typically manufactured from Nomex fabric with a specific weight between 150 and 220 gm/m²
- The suit must consist of three main layers:
- Outer Shell: Made from Nomex fabric and coated with the desired color. This outer layer does not ignite, repels water, and is tear-resistant.
- Moisture Barrier: This is the environmental protection layer, made from cotton or synthetic fabrics. It serves as the second line of defense after the outer shell. Its purpose is to prevent external liquids from reaching the body while also maintaining body temperature and preventing heat exhaustion.
- Thermal Liner: The innermost layer, positioned closest to the body, providing insulation and additional thermal protection.
📊 Proximity Suit vs. Entry Suit — Quick Comparison
| Feature | Proximity Suit | Entry Suit |
|---|---|---|
| Heat Reflectivity | ~90% radiant heat | ~95%+ radiant heat (9-layer aluminum) |
| Max Temperature | Up to ~500°C | Up to 815°C (1,499°F) |
| Construction | Heat-reflective outer layer | 9 fiberglass layers with aluminum insulation |
| Typical Use | Active firefighting operations | Walking through fire for rescue or valve shutoff |
| Fire Types | Liquid & gas fires | All fire types including direct flame contact |
| Weight & Mobility | Lighter, more mobile | Heavier, more restrictive |
📋 Article Summary — Key Takeaways
- Firefighters face three primary occupational hazards: burn injuries, heat stress, and increased cancer risk from prolonged exposure to hazardous materials.
- Flame-resistant (FR) fabrics have fire resistance built into their fiber chemistry, while fire-retardant fabrics rely on chemical treatments that degrade over time.
- Key FR materials include Nomex (up to 370°C), Kevlar (up to 427°C), Modacrylic fibers, and PTFE-coated fiberglass thread (up to 550°C).
- Inherent fabrics maintain their flame-resistant properties permanently, whereas treated fabrics lose effectiveness with washing and wear.
- FR clothing should fit slightly loose to create an insulating air gap, but not so loose as to snag or restrict movement.
- Proper care of FR garments involves washing with soft water, avoiding chlorine bleach and fabric softeners, and air-drying when possible.
- Firefighter suits consist of three critical layers: the Outer Shell (Nomex), the Moisture Barrier, and the Thermal Liner.
- Two main suit types exist: the Proximity Suit (for approaching fires) and the Entry Suit (for walking through fire, withstanding up to 815°C).
- All fire suits must comply with SOLAS safety standards, including endurance testing at 260°C for 5 minutes and use of 30-meter fire-resistant rescue ropes.
- Research confirms that phosphorus/nitrogen-based treatments (PF) outperform organo-phosphorus alternatives (PR 20) in long-term wash durability.