When to use Nextel™ 720 Industrial Fibers & Nextel™ 720 Composite Fibers

3M™ Nextel™ Fabric 720, composed of 85% alumina and 15% silica, offers the lowest creep of any Nextel™ Fiber at temperatures up to 2102°F (1150°C). This makes the fiber or fabric suited for load bearing ceramic matrix composites used in industrial, aerospace and automotive applications.

When selecting the fiber type for a particular application, it is important to consider all these factors. Other factors, such as corrosion, chemical resistance, or atmospheric conditions may influence the final selection.

3M™ Nextel™ 720 Ceramic Fiber Typical Properties

Property	Units	3M™ Nextel™ 720
Use Temperature	—	2200°F
Filament Diameter	mm	10-12
Crystal Size	nm	<500
Crystal Type		alpha Al2O3 + mullite
Density	g/cc	3.40
Filament Tensile Strength (51mm gage)	MPa	2100
Filament Tensile Modulus	GPa	260
Surface Area	m2/g	<.2
Composition	wt%	85 Al2O3 15 SiO2
Thermal Expansion (100-1100°C)	ppm/°C	6
Dielectric Constant	(@ 9.375 Ghz)	~5.8

3M™ Nextel™ Roving 720 – Typical Properties

Color: Green

Roving	Nominal	Yield ± 10%		Breaking Load*
	Filament
	Count	yds/lb	m/kg	lbs	kg
1500 denier (167 tex)	400	2950	5950	6	2,7
3000 denier (333 tex)**	750	1490	3000	10	4,5

Note:  All yields are based upon sized rovings and yarns.  The allowable range in add-ons for sizing is 1.1 to 3.0% by weight.  The allowable tolerance on final twist is ± 30%.
*  Tested at room temperature.
**  The allowable tolerance on final twist is ± 30%.  Other twist levels available.

3M™ Nextel™ 720 Roving Strength – Maximum Temperature Limit

	Roving Strength
Fiber	Maximum
	Temperature Limit
Nextel™ 720	>1400°C

* Strain rate = 12.5 mm/min

Fiber Weight Loss Nextel™ 720 Ceramic Fiber Roving

Roving samples were subjected to 2192°F (1200°C) for fifteen hours. Fibers were weighed before and after the fifteen hour exposure in order to determine weight loss. The fiber evolves B2O3 at temperatures greater than 2012°F (1100°C).

Fiber	Weight Loss %
720	0

Shrinkage on Nextel™ 720 Fiber

Roving samples were held at each temperature for fifteen hours. After that time they were measured for shrinkage. All fiber compositions showed less than three percent shrinkage after fifteen hours at 2372ýF (1300ýC). Nextel™ 720 Fiber compositions showed shrinkage of less than 1.5% at these conditions.

Nextel™ Ceramic Fiber 720 Moisture Absorption

The 3M™ Nextel™ Ceramic Fibers 720 absorb very little moisture due to their smooth, non-porous surface. Fibers exposed to 100% relative humidity for several hours at room temperature had 0.08% weight gain.

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Further information on 3M™ Nextel™ 720 Ceramic Textiles

• Nextel™ 720 MSDS

Further information on other 3M™ Nextel™ Ceramic Textiles

• Click for Nextel™ 312
• Click for Nextel™ 440
• Click for Nextel™ 550
• Click for Nextel™ 610

 

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