Nomex is a refractory meta-aramid material developed in the early 1960s by DuPont and first marketed in 1967.
Video Nomex
Properties
Nomex and related aramid polymers are associated with nylon, but have aromatic spine, and are therefore more rigid and more durable. Nomex is an example of the meta variant of aramid (Kevlar is para aramid). Unlike Kevlar, Nomex can not harmonize during filament formation and has a worse power. However, it has excellent thermal, chemical, and radiation resistance to polymer materials.
Maps Nomex
Production
Nomex is produced by the condensation reaction of monomer m -phenylenediamine and isophthaloyl chloride.
These are sold in the form of fibers and sheets and are used as fabrics where the resistance of heat and fire is required. The Nomex sheet is actually a calendar paper and is made in the same way. The Nomex Type 410 paper is a type of original paper developed and one of the larger types of classes made, mostly for electrical insulation purposes. Nomex fibers are made in the United States.
Wilfred Sweeny (1926-2011), DuPont scientist responsible for the discovery that led to Nomex, obtained the DuPont Lavoisier Medal, partly for this work in 2002.
Apps
Nomex paper is used in electrical laminates such as circuit boards and transformer cores as well as the structure of a fireproof honeycomb where it is saturated with phenolic resins. This honeycomb structure, as well as mylar-Nomex lamination, is widely used in aircraft construction. Both the car and fire racing industry use Nomex to create clothing and equipment that can withstand intense heat.
Nomex's hood is a common racing and fire-fighting equipment. It is placed in the head on the face mask of the fire extinguisher. The veil protects the head that is not covered by a helmet and face mask from a very hot fire.
The Wildland firefighters wore Nomex suits and trousers as part of their personal protective equipment during the fire suppression activities.
Racing car drivers wear Nomex riders and or other refractory materials, along with Nomex gloves, long underwear, balaclavas, socks, helmet lining and shoes to protect them in case of fire.
Military pilots and aircrew wear flying clothes made of more than 92 percent of Nomex to protect them from possible cockpit and other crash fires. Recently, troops driving land vehicles also started using Nomex. Kevlar threads are often used to hold the cloth together.
Military tank drivers also typically use Nomex hoods to protect against fire.
In the US space program, Nomex has been used for Thermal Micrometeoril Garmes in Extravehicular Mobility Units (together with Kevlar and Gore-Tex) and ACES pressure settings for both fire protection and extreme environments (immersion to vacuum close), and as a thermal blanket on the payload bay door, the fuselage, and the upper wing surface of the Space Shuttle Orbiter. It has also been used for airbags for the Mars Pathfinder and Mars Exploration Rover missions, Galileo's atmospheric probe, Cassini-Huygens Titan probe, as an external cover on AERCam Sprint, and planned to be incorporated into NASA's Future Crew Exploration. Vehicle.
Nomex has also been used for its acoustic quality, first used in Troy, NY, in Rensselaer Polytechnic Institute's Experimental Media and Performing Arts Center (EMPAC's) main concert hall. The Nomex canopy ceilings reflect high and medium frequency sounds, giving echoes, while allowing lower frequency sounds to partially pass through the canopy. According to RPI President Shirley Ann Jackson, EMPAC is the first place in the world to use Nomex as an architectural material for acoustic reasons.
Nomex (like Kevlar) is also used in the production of loudspeaker drivers.
Honeycomb-structured Nomex paper is also used as a spacer between lead layers in the ATLAS Liquid Argon Calorimeter, and as a laminate core for hull and deck construction on special boats.
Nomex is used in industrial applications as a filter in a filtration system, usually a baghouse, associated with hot gas emissions found in asphalt plants, cement plants, steel smelting facilities, and non-ferrous metal production facilities.
History
The death of the car racer in a fiery collision, especially from Fireball Roberts in Charlotte, and Eddie Sachs and Dave MacDonald in Indianapolis in 1964, led to the use of refractory fabrics like Nomex. In early 1966 the Press and Autoweek Competition reported: "Over the past season, experimental driving suits were worn by Walt Hansgen, Masten Gregory, Marvin Panch and Group 44 Bob Tullius; these four represented a fairly good cross section in the world sport.The goal is to get test information on the comfort and washing characteristics of Nomex.The Chrysler-Plymouth team at the recent 500 Trend Motor at Riverside are also wearing this suit. "
See also
- Aramid
- Kevlar
- Twaron
- Silica Airgel
- PET Movie
- Thermal Micrometeoroid Garment
- Gore-Tex
- Vectran
- Marlan
References
External links
- DuPont Nomex
- Dupont.com - Nomex - 2007 40th Anniversary
- Comparison of single-layer Nomex settings
Source of the article : Wikipedia
0 Comments