Weave Technology in our Fire Suits

Weave Technology in our Fire Suits

With the other layers of a Fire Suit the technology for performance improvement is all in the weave!

We at apparel Supply believe the two best options in weave technology are:

  1. Twin System®

  2. Twin Square®

Twin System® is a patented weaving technology in which the Kevlar content is woven into back side of the material in a grid formation. This construction increases the mechanical performances without modifying the look or weight.

If we compare two fabrics of identical weight and construction, we notice that the product reinforced with the TWIN SYSTEM® technology has better provided better performance across many aspects including.

  • Tensile Strength: increased by 40%.

  • Tear Strength: multiplied three-fold (according to ISO 13937-2).

  • Look After washing : para-aramid grid on Back, significantly improves colour fastness from washing.

  • Heat Transfer: protection increased thanks to very tight woven

  • Chemical Repellency: meets EN 469 requirements, in addition when treated X.P.S. finish, the fabric is proofed against oil products and unleaded petrol, see X.P.S brochure.

  • UV Exposure: without consequences on mechanical properties since the reinforcing grid is not exposed to light.

Our Twin System Nomex Structural Fire Fighting Suits also offer the advantages as it:

Significantly exceeds all EN 469:2020 requirements with superior Tear Strength, due to Technora back grid.

Excellent Abrasion Performance, as 20gm heavier than PBI suits or equivalent.

The Twin System grid at the back, provides more stretch and comfort, has 4-way stretch due the technology.

Next week we will talk about the advanced version Twin Square® and how it works as it takes advantage of well known saying in Fire Fighting:

Air is the best insolation.

See below for performance in tear and tensile strength in twin system technology vs classic fire weaves.

What Is An Arc Flash?

An arc flash is a sudden release of electrical energy that occurs when current jumps across a gap between two conductors or from a conductor to a ground. The arc flash generates an intense burst of heat and light that can cause serious injuries, damage to equipment, and fires.

Arc flashes can occur in a wide range of electrical systems and equipment, including switchgear, transformers, motors, and other high-voltage components. They can be caused by a variety of factors, including equipment failure, human error, or a short circuit.

The intense heat generated by an arc flash can cause severe burns, as well as ignite clothing and other materials in the surrounding area, leading to secondary fires. The bright light from the arc flash can also cause temporary or permanent vision damage.

To prevent arc flash incidents, it’s important to follow proper electrical safety procedures, including wearing appropriate personal protective equipment (PPE), de-energizing equipment before working on it, and maintaining a safe distance from energized equipment.

Understanding Arc Ratings and Calories

Now that you understand FR clothing is tested and given an arc rating, you know that the arc rating measures the amount of heat the flame resistant fabric blocks when exposed to electric arc. The arc rating is the number of calories that the garment is expected to “absorb” if exposed to an electric arc. Arc rating is, in essence, the level of protection provided to you, the wearer.

Calorie is the unit of measure of the heat energy of an arc flash and the protective level of FR clothing. The bigger the calorie number, the greater the heat energy level of arc flash and the greater the protective level of the clothing. You will be protected from an electric arc if your clothing has a higher calorie arc rating than the calories of heat generated by the arc.

While it does not matter if the fabric has an Ebt,  ATPV and or ELIM value, it is important to pay attention to the calorie level the fabric can support* (as expressed in cal/cm2)