When to use Nextel™ 440 Fibers
3M™ Nextel™ Ceramic Textiles and Composites provide innovative solutions in industries from aerospace to petroleum refining to metal processing. The outstanding thermal protection provided by Nextel™ Fabrics, Tapes and Sleevings allows engineers and manufacturers to handle high temperature applications up to 2500°F (1371°C).
Nextel™ Composite Fibers
The family of 3M™ Nextel™ Fibers was developed to serve a variety of needs. 3M™ Nextel™ Fibers 312, 440, and 550 are designed for non-structural applications where their primary purpose is to insulate or to act as a flame barrier. To aid in the selection of the proper fiber for each of these different applications, the fibers are tested in a manner appropriate to their end use.
3M™ Nextel™ 440 Ceramic Fiber Typical Properties
3M™ Nextel™ Roving 440 – Typical Properties
3M™ Nextel™ Plied Yarn 440 – 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™ 440 Roving Strength Maximum Temperature Limit
* Strain rate = 12.5 mm/min
Fiber Weight Loss Nextel™ 440 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™ 440 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™ 440 Fiber compositions showed shrinkage of less than 1.5% at these conditions.
Nextel™ Ceramic Fiber 440 Moisture Absorption
The 3M™ Nextel™ Ceramic Fibers 440 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.
Cryogenic Testing on 3M™ Nextel™ Woven Tape 440
Five samples of 3M™ Nextel™ Woven Tape 440 1 inch (2,54 cm) wide were cut to 6 inch (15,2 cm) lengths for testing in liquid nitrogen.
Samples were heat cleaned at 1472 F (800 C) for one hour to remove the sizing before testing.
Samples were placed in liquid nitrogen to soak for three minutes. Samples were then removed and tested for strength retention.
A second set of five samples was dipped into liquid nitrogen ten times and then tested for strength retention.
Radiation Resistance & Microwave Measurement - 3M™ Nextel™ Ceramic 440 Radiation Resistance
Exposure to radiation from a Cobalt 60 source did no noticeable damage to the 3M™ Nextel™ Fiber 440. A total of 1 x 107 rads at an exposure rate of 2.1 x 10 5 rads/hour did not change the tensile strength of the fibers, yarns or fabrics made from the fibers.
Power Transmission and Reflection for 3M™ Nextel™ Fabric panels 18 inch x 18 inch (45.7 cm x 45.7 cm) at 10 GHz.
*Sample held with styrofoam panels, angles of incidence 0°.
3M™ Nextel™ Woven Fabric 440 – Thermal Optical Properties*
The optical properties of fibers on the exterior of the space craft controls the amount of solar heating that will occur in orbit. For instance, a low absorptivity would be desired if one were designing components for a spacecraft mission. This would reflect most of the sun’s energy and protect the craft and the instruments from high temperatures.
Optical measurements were made on 3M™ Nextel™ Woven Fabric 440 using a Gler Dunkle DB-100 Emissometer and MS-251 Solar Reflectometer machines. The average absorptance () and emittance () are as follows:
NASA Nonmetallic Material Testing*
Flammability, Toxicity and Thermal Vacuum Stability testing on 3M™ Nextel™ Woven Fabrics was performed using procedures specified in NHB 8060.1B and SP-R-0022A.
Flammability: Passed test in 30% oxygen and 10 psia environment.
Toxicity: Passed Test.
Thermal Vacuum Stability: Heat cleaned fabric passed test. Sized 3M™ Nextel™ Fabric outgassed volatile condensable materials of 0.15%, which exceeded the required limit of 0.1 weight %.
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Further information on 3M™ Nextel™ 440 Ceramic Textiles
Further information on other 3M™ Nextel™ Ceramic Textiles
Thermostatic Industries, Inc, 2075 Belgrave Av, Huntington Park, California 90255, USA
Offices Located in the Los Angeles, California Area - Stock Textiles & Custom Fabricated Textiles Delivered Globally.
Phone (800) 345-4217 or (323) 277-0900 (International) • Fax (800) 710-0270 or (323) 277-0909 (International)