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When to use Nextel™ 550 Industrial Fibers & Nextel™ 550 Composite Fibers

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The family of 3M™ Nextel™ Fibers was developed to serve a variety of needs. 3M™ Nextel™ Fiber 550 is designed for non-structural applications where their primary purpose is to insulate or to act as a flame barrier.

Nextel™ Ceramic Fiber 550 is used in the electronic market for both insulation and seals.

When the fiber is stressed at high temperature, the glassy phase weakens the fiber due to viscous flow much like a glass fiber. 3M™ Nextel™ Ceramic Fiber 550 does not contain B2O3 and therefore does not have a glassy phase. At exposure temperatures higher than 2192°F (1200°C), the strength of 3M™ Nextel™ Ceramic Fiber 550 is lower strength than 3M™ Nextel™ Ceramic Fiber 440 due to the formation of larger grained mullite.

On the other hand, because 3M™ Nextel™ Ceramic Fiber 550 has no glassy phase it retains its strength better at temperature as is shown in the graph below where the roving is tested at temperature.

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™ 550 Ceramic Fiber Typical Properties


Property

Units

3M™ Nextel™ 550

Use Temperature

2200°F

Filament Diameter

mm

10-12

Crystal Size

nm

<500

Crystal Type

 

gamma/delta Al2O3
+ amorph.
SiO2

Density

g/cc

3.03

Filament Tensile Strength (51mm gage)

MPa

2000

Filament Tensile Modulus

GPa

193

Surface Area

m2/g

<.2

Composition

wt%

73 Al2O3
15 SiO2

Thermal Expansion (100-1100°C)

ppm/°C

5.3

Dielectric Constant

(@ 9.375 Ghz)

~5.8

3M™ Nextel™ Roving 550 – Typical Properties


Color: Blue

Roving

Nominal

Yield ± 10%

Breaking Load*

 

Filament

 

 

 

 

Count

yds/lb

m/kg

lbs

kg

1000 denier (111 tex)

400

4460

8990

9

4,1

2000 denier (222 tex)

750

2230

4490

14

6,4

3M™ Nextel™ Plied Yarn 550 – Typical Properties


Color: Blue

Yarn

Ends

Diameter

Yield ± 10%

Breaking Load*

 

 

in

mm

yds/lb

m/kg

lbs

kg

1000 denier (111 tex) 2.7 Twists/inch (106 Twists/m)**

1/2

2

0.010

0,25

2150

4330

21

9,5

2000 denier (222 tex) 2.7 Twists/inch (106 Twists/m)**

1/2

2

0.017

0,43

1070

2160

36

16,3

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™ 550

1300°C

* Strain rate = 12.5 mm/min

Fiber Weight Loss Nextel™ 550 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 %

550

0

Shrinkage on Nextel™ 550 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™ 550 Fiber compositions showed shrinkage of less than 1.5% at these conditions.

Nextel™ Ceramic Fiber 550 Moisture Absorption


The 3M™ Nextel™ Ceramic Fibers 550 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.


Back to 3M™ Nextel™ Overview

Further information on 3M™ Nextel™ 550 Ceramic Textiles

Further information on other 3M™ Nextel™ Ceramic Textiles

Call Thermostatic today for help with ceramic textiles!

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