Zetex (fabric)
{{one source|date=October 2013}}
{{primary sources|date=December 2012}}
Zetex fabrics were invented by Bal Dixit in 1978. This highly texturized fiberglass fabric exhibits many of the same properties as asbestos, such as resistance to heat, corrosion and rot resistance, outstanding electrical properties, ability to withstand molten metal, and thermal insulation. However, it does not carry the same health risks.Dixit, B., "Performance of Protective Clothing: Development and Testing of Asbestos Substitutes," Performance of Protective Clothing. ASTM STP 900, R. L. Barker and G. C. Coletta, Eds., American Society for Testing and Materials, Philadelphia, 1986, pp. 445-460{{Verify source|date=April 2021}}{{Why|reason=No explanation is given for why Zetex cannot be expected to carry similar health risks.|date=April 2021}}
Testing
Zetex has been tested against asbestos to prove it is a good replacement. Two Zetex filaments were created, one with a 9 um diameter (G) and a 6 um diameter (DE).
=Physical Properties=
Chrysotile, the most commonly encountered form of asbestos, has a density of 40 oz/yd2, while Zetex G has a density of 35 oz/yd2, and Zetex DE has a density of 32 oz/yd2. Other physical properties are listed in the table below:
| style="margin:auto"
| {| class="wikitable" |+Table 1 - Comparison of properties of asbestos and texturized fiberglass (Zetex) ! Property ! Asbestos (Chrysotile) ! Zetex G Filament ! Zetex DE Filament |
| align="left"|Density (oz/yd2)
| align="center"|40 || align="center"|35 || align="center"|32 |
|---|
| align="left"|Breaking Strength, lb (Warp/Fill)
| align="center"|160/80 || align="center"|346/423 || align="center"|442/428 |
| align="left"|Abrasion Testing
(cycles to failure - CS10 Wheel, 500 g/wheel) | align="center"|230 to 824 || align="center"|493a || align="center"|871 |
| align="left"|Thermal Properties
"K" value, Btu/h/in./ft2/°F | align="center"|.8190 || align="center"|.3385 || align="center"|.3399 |
a CS17 Wheel, 1000 g/wheel
|}
=Temperature rise testing=
A glove was fabricated from this material to allow for further testing to be done. A thermocouple was used to test the inside temperature of the glove while holding a 600°F(316°C) pipe. A measure was taken to see how long it took the inside to reach 140°F. Both gloves included the same wool liner. Another test was done with a 1200°F(649°C) pipe.
| style="margin:auto" |
| {| class="wikitable"
|+ Table 2 - Rise in Glove Temperature (in F) with a 600°F pipe ! Time (s) ! Zetex ! Asbestos |
| 0
| 77 | 77 |
|---|
| 5
| 86 | 86 |
| 10
| 89 | 95 |
| 15
| 99 | 112 |
| 20
| 112 | 123 |
| 25
| 123 | 131 |
| 30
| 133 | 136 |
| 35
| 140 | 142 |
|
| class="wikitable"
|+ Table 3 - Rise in Glove Temperature (in F) with a 1200°F pipe ! Time (s) ! Zetex ! Asbestos |
| 0
| 80 | 80 |
|---|
| 5
| 85 | 105 |
| 10
| 92 | 135 |
| 15
| 110 | ... |
| 20
| 135 | ... |
| 25
| ... | ... |
| 30
| ... | ... |
| 35
| ... | ... |
|}
Uses
Zetex can be used for a variety of fire protection applications.
=Entertainment and theatres=
Zetex has replaced asbestos as the material for the large fire curtains that lower and close off the stage opening in case of a fire in a proscenium type theatre or auditorium.{{Cite web|url=http://www.jrclancy.com/fire-curtains.php|title=JR Clancy {{!}} Fire Safety Curtain Systems {{!}} Fire Curtains|last=Communications|first=Endorse|website=www.jrclancy.com|language=en|access-date=2018-07-11}}
=Construction=
During welding, workers can wear Zetex-made fire suits for protection. Also, Zetex material can be used for fabric expansion joints, creating fire barriers in buildings.
=Automotive=
Zetex material can encapsulate gas tanks or exhaust pipes, protecting from fire caused by gas leaks.
=Foundries/Welding=
Zetex suits can be used in welding applications, protecting the worker from sparks and other molten objects. It can also be used to create a fire barrier.
=Fire Safety=
Fire departments can use Zetex made suits to battle fires due to Zetex's heat resistant properties. Full engulfment capabilities of the suit make for a good emergency combatant.{{Cite web|url=https://www.newtex.com/nxp/fire-entry|title=Fire Entry Suits {{!}} Newtex|website=www.newtex.com|language=en|access-date=2018-07-11}}
=Glassblowing=
When boxing a newly finished piece of glass for annealing a glassblower may utilize Zetex gloves to hold the finished piece in transition from the knock off table to the annealer.
References
{{Reflist}}
External links
- [http://www.newtex.com/ Newtex Industries]