Nylon Fiber, Type 1775
This is a sample nylon Type 1775 fiber from the sample-set provided by Textile Fabric Consultants, Inc.
Nylon Type 1775 is a trademarked product of the Monsanto Chemical Company. The moderate birefringence and irregular cross-section
(trilobate) of the fiber results in the third to forth order interference colors seen here.
Transmitted Crossed Linear Polarized Light
Nylon fiber is a polyamide fiber. It is formed by the careful combination of a diamine and a dicarboxylic acid or by a ring-
opening polymerization. It is formed into a fiber by extruding the heated polymer through a spinneret. This results in the
The fiber taking the cross-section of the spinneret. Nylon fiber can be round or any other desirable extruded shape.
Significance in the Environment:
This is a common clothing fiber.
Rayon fiber has a refractive index along its length of about 1.57 to 1.59 and perpendicular to its length of about 1.51
to 1.53. It has a birefringence of about 0.06 and a positive sign of elongation. It tends to exhibit a smooth, regular
surface along its length depending on its cross-section of the fiber. Extreme shapes, such as the trilobate Type 1775, can
result in an irregular appearance along the length as the fiber twists or bends.
DuPont Company Techinical Bulletin X-156: IDENTIFICATION OF FIBERS IN TEXTILE MATERIALS, December 1961.