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Fire suit, which is sometimes known as ‘bunker gear’ and ‘turnout gear’, consist of several protective layers of heat-resistant synthetic materials called aramids. These suits must not only protect the wearer from obvious extreme heat and burns, but they must also allow air transfer (to let cool air into the suit and expel body-heated air away), as well as preventing moisture buildup inside the gear itself. There are three main layers to a fire suit: the outer shell, the moisture barrier and, lastly, the thermal layer.
The silver-coloured outer shell seen in these images here must be tough enough to withstand splashes of molten metal, yet flexible enough to enable the
wearer to remain mobile. This layer is often a combination of carefully woven fibers made of a fire-resistant variant of Kevlar called NOMEX. A tight weave ensures that the material resists ripping during often strenuous firefighting activity. It also offers a degree of moisture deflection.
Below the outer shell comes an essential moisture barrier, which prevents liquids and chemicals from passing into the suit. This material consists of a breathable fabric such as Breathe-Tex, sewn in with the NOMEX/Kevlar blend.
Third is a strong thermal layer made from Kevlar-based fibres woven into the material. Flames won’t penetrate
through this layer and it also absorbs around three-quarters of a fire’s heat. The temperature of a typical fire ranges from 400-800 degrees Celsius (750-1,470 degrees Fahrenheit).
Function of Outer Shell
The purpose of the outer shell is to protect the firefighter from direct flame while providing abrasion and tear resistance and some thermal protection. Outer shell fabric comes in a variety of fiber blends, weaves, and weights, which impacts break-open resistance, strength, abrasion resistance, flexibility, and durability.
Function of Moisture Barrier
The moisture barrier protects the firefighter from water and NFPA “common liquids” (chlorine, battery acids, aqueous film forming foam, gasoline, hydraulic fluid, and antifreeze fluid) and is also tested for resistance to blood borne pathogens. The moisture barrier is required to provide “breathability” – letting perspiration move away from the wearer. This layer is made from an engineered membrane laminated to a woven or non-woven substrate.
Function of Thermal Liner
The thermal liner provides most of the thermal protection from ambient heat – the more thermal protection, the longer it will take for the firefighter to feel the heat. Thermal liners typically consist of a lightweight woven face cloth lining facing your body quilted to one or more layers of insulating non-woven batting.
The face cloth is made from a variety of fibers in spun (like cotton) form or filament (like fishing line) or a combination of the two. With more filament fiber, the lining fabric slides more easily against your body, which makes the gear more comfortable as well as making it easier to slide in and out of your gear.
The batting is typically a one-layer needle punch (like felt) or two or more layers of a spun lace (hydro-entangled) which is lighter and more flexible.
Both the thermal protective performance and the “breathability” are tested on the base three-layer composite that makes up the turnout gear. The TPP test was introduced in the 1986 edition of NFPA 1971, with a minimum performance rating of 35, which remains the required test value today. In this test, samples of the three-layer composite are subjected to a bank of quartz lamps simultaneously with direct flame exposure, simulating flashover conditions.
The TPP value is determined strictly by the three material layers specified and is not impacted by design or construction. Different combinations will yield different results and, roughly speaking, if you take the TPP value of any three-layer ensemble and divide it in half, this would be the number of seconds of escape time for a firefighter caught in this environment before he would receive a second degree burn.
The second test, total heat loss (THL) is often referred to as the breathability test. The THL test was first introduced in the 1997 edition of NFPA 1971 as an annex item and became a requirement in the 2000 edition. This test is run on a guarded sweating hot plate and measures the ability of the same three base layers to allow heat to pass through the composite.
Not surprisingly, these two tests are like a see saw; in the TPP test we are measuring the ability of the layers to deter heat from the outside environment entering through the system, and in the THL test we are measuring the ability of these same three layers to dissipate body heat from the inside to the outside.
Types of Fire Suit
- NOMEX Fire Suit
- Aluminized Fire Suit
- Aluminized Fire Entry Suit
What is Firefighter Turnout Gear?
SELF-CONTAINED BREATHING APPARATUS
PERSONAL ALERT SAFETY SYSTEM (PASS)
Fire Suit Price in Pakistan
Fire Suits are offered in variety of materials or fabrics and price is governed by your selection. Average price range is PKR 40,000.00 – 200,000.00. Please Contact Us for any of your requirement