When to use Nextel™ 550 Industrial Fibers & Nextel™ 550 Composite Fibers
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
3M™ Nextel™ Roving 550 – Typical Properties
3M™ Nextel™ Plied Yarn 550 – Typical Properties
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%.
3M™ Nextel™ 720 Roving Strength Maximum Temperature Limit
* 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).
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
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