STEDAIR® PREVENT – Particulate Hood Technology

STEDFAST is introducing a highly breathable, air permeable and flame resistant material offering superior particle blocking performances. Stedair® PREVENT, consists of a composite barrier made from Stedair® moisture barriers proprietary technology.

The heads and necks of firefighters are highly sensitive to concentrations of carcinogenic chemicals build up, as these areas are often left exposed, which in turn puts them at a higher risk for health problems. Average hoods' tend to offer limited, if no protection against toxic particles. Stedair® PREVENT offers outstanding breathability, increased air permeability and a unique construction for ease of movement and flexibility. These combined properties enable Stedair® PREVENT to minimize heat stress while reducing exposure to damaging chemicals.

Stedair® PREVENT when tested accordingly to NFPA 1971 not only meets the required 90% blocking efficiency but exceeds with results of 98% blocking efficiency with marginal loss after extreme conditioning against particle size.


Protection

Thermal Protective Performance (TPP), flame and heat resistance are three fundamental properties used in NFPA 1971 in order to quantify the protection level. In addition, Stedair® PREVENT also offers protection against carcinogenic and other toxic particles.

Smoke and soot particles are highly toxic carcinogens as they are absorbed through the skin and lungs. The PPE helps reduce chemical permeation to the skin. Concentrations of toxic chemicals on the neck are usually higher than other areas of the body, due to their exposed nature. Other hoods offer limited protection against particles in comparison to Stedair® PREVENT.

Stedair® PREVENT when tested accordingly to NFPA 1971-SECOND DRAFT paragraph 7,14.2 not only meets the required 90 % blocking efficiency but exceeds with results of 98 % blocking efficiency with marginal loss after extreme conditioning against particle sizes from 0,1 micron to 1 micron. (When tested with another layer of 8 oz/yd2). (See graphic. 1).


Thermal Protective Performance (TPP)

TPP is a sophisticated test method that measures the rate at which convective and radiant heat penetrates through the hoods composite: outer layer, and Stedair® PREVENT – to cause second-degree burns to human skin.

A hood’s TPP score is twice the number of seconds it takes for a second-degree burn to occur when exposed to an energy of 2.0 cal/cm2.

For example a TPP rating of 20 cal/cm2 * (minimum requirement) would equate to 10 seconds of protection until a second-degree burn would occur on human skin in the conditions simulated in the TPP test.

Stedair® PREVENT when tested accordingly to NFPA 1971-2013 for TPP offers industry leading TPP results, as shown in the following example: When tested with another layer of 8 oz/yd2- 20 % NOMEX- 80 % Lenzing, results are showing a TPP greater than 30 Cal/cm2, exceeding the minimum requirement of 20 Cal/cm2.


Graphic 1. Percentage Blocking Efficiency - ASTM 2299/F2299 Modified as per NFPA 1971 Second Draft

Flame Resistance

Flame resistance tests determine how readily a material resists to ignition when in contact with a flame and its burning behavior once the flame is removed.

Flame resistance testing is performed by contacting the edge of a material with a flame for a period of 12 seconds.

After the specimen is removed from the flame, the time the material continues to burn is reported as the “after flame” time, while the distance that the material is damaged by the flame, is determined as “char length”. The tested materials are also inspected for melting and dripping. NFPA 1971 dictates that the outer shell, moisture barrier, and thermal barrier materials cannot have an after flame time of more than 2 seconds, char lengths greater than 4 inches, or exhibit melting or dripping.

Stedair® PREVENT when tested accordingly to NFPA 1971-2013 for flame resistance offers the following results: After Flame: 0 sec (min.) per direction Char length: < 3 inches per direction And demonstrating no melt, no drip.


Heat Resistance

Heat resistance testing is conducted by placing the test specimen in an oven for a period of time and then examining the condition of the specimen after it is removed. The test involves a 5-minute exposure in an oven set at 500°F (260°C). Following exposure to heat, the specimen cannot ignite, melt, drip, or separate, and must not exhibit shrinkage of more than 10% in any direction.

Stedair® PREVENT when tested accordingly to NFPA 1971-2013 heat resistance offers excellent results, as shown below: Shrinkage: Width -5.0%, Length: -7.0%

From the aforementioned facts, it is clear that in terms of protection, when tested against percentage blocking efficiency, TPP, flame resistance and heat resistance, Stedair® PREVENT offers excellent protection, as we go above and beyond to ensure the safety of firefighters.


Comfort Properties

In order to minimize heat stress Stedair® PREVENT combines, outstanding breathability, increased air permeability as well as our unique construction for ease of movement and flexibility.

In order to best evaluate these properties we put Stedair® PREVENT under the Thermal Heat Loss test. Since the introduction of the THL requirements for Moisture Barriers in the NFPA standard, heat stress related deaths have fallen significantly.

The Total Heat Loss (THL) is defined as the amount of heat transferred through a material or a composite by the combined dry and evaporative heat exchanges under specified conditions expressed in Watts per square meter (w/s).

Stedair® PREVENT when tested with an outer layer of 8 oz/yd2-20 % NOMEX- 80 % Lenzing, accordingly to NFPA 1971-SECOND DRAFT for THL offers results greater than 420 W/m2 (min.), exceeding the minimum requirement of 325 W/m2 (min.) industry outstanding THL results, as per Graphic 2.

Unlike other moisture barriers, Stedair® PREVENT allows air to go through while blocking harmful materials from entering, this offering air permeability and ease of cooling.


Graphic 2. THL Results as per NFPA 1971 PAR.7.14.3

Graphic 3. Air Permeability ASTM D737 (CFM)

Unlike a moisture barrier, Stedair® PREVENT also allows air to go thru, hence offering air permeability for ease of cooling.

Durability

When Stedair® PREVENT is tested according to NFPA 1971-SECOND DRAFT paragraph 7,14.2 not only meets the required 90 % blocking efficiency, but surpass with results of 98 % blocking efficiency with marginal lost after extreme conditioning against particle sizes from 0,1 micron to 1 micron. (When tested with another layer of 8 oz/yd2 ). (See graphic 1)

Also when tested accordingly to NFPA 1971-2013 for bursting strength (physical strength of a textile product linked with durability) Stedair® PREVENT offers unmatched results: 550 N, more than 2 times the requirement (min 225 N).

Bursting strength is a measure of the physical strength of a textile product and is an important indicator of durability.


Reliability

In terms of protection, comfort, durability, Stedair® PREVENT offers no compromise on performance.

Stedair® Prevent Spec Sheet

STEDAIR® PREVENT demonstration as seen at FDIC

Air Permeability Video

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