Micarta

Micarta is a brand name for composites of linen, canvas, paper, fiberglass, carbon fiber or other fabric in a thermosetting plastic. It was originally used in electrical and decorative applications. Micarta was developed by George Westinghouse at least as early as 1910 using phenolic resins invented by Leo Baekeland. These resins were used to impregnate paper and cotton fabric which were cured under pressure and high temperature to produce laminates. In later years this manufacturing method included the use of fiberglass fabric and other resin types were also used. Today Micarta high pressure industrial laminates are produced with a wide variety of resins and fibers. The term has been used generically for most resin impregnated fibre compounds. Common uses of modern high pressure laminates are as electrical insulators, printed circuit board substrates, and knife handles.

The Micarta trademark is a registered trademark of Industrial Laminates / Norplex, Inc. (dba Norplex-Micarta).

Manufacturing process

Micarta knife handle

Micarta industrial laminates are normally phenolic, epoxy, silicone, or melamine resin based thermoset materials reinforced with fiberglass, cork, cotton cloth, paper, carbon fiber or other substrates. Micarta industrial laminate sheet is a hard, dense material made by applying heat and pressure to layers of prepreg. These layers of laminations are usually of cellulose paper, cotton fabrics, synthetic yarn fabrics, glass fabrics, or unwoven fabrics. When heat and pressure are applied to the layers, a chemical reaction (polymerization) transforms the layers into a high-pressure thermosetting industrial laminated plastic.

Micarta industrial laminates are manufactured in dozens of commercial grades.

Applications

Compressed natural gas storage cylinder in the process of being installed in saddle supports using micarta insulation as an electrical insulator.

The largest use for Micarta industrial laminates is a high strength electrical insulation in power generating and distribution equipment. Laminates are also used in heavy equipment, aerospace, automotive, office equipment, tabletops, countertops, electronic, electrical insulation between pressure vessels or piping and their supports, decorative applications, including knife handles and handgun grips, guitar fingerboards, nuts^[1] and bridges, pool cues, and safety gear such as hard hats. Between 1935 and 1945, Westinghouse's Power-Aire desk fans used blades made of Micarta.

Micarta 259-2 was used as the ablation heat shield material in early ICBM warheads.^[2]

Ownership

Micarta's industrial laminate division and name was purchased by Norplex in 2003, merging two of the largest industrial laminate manufactures in the United States. Norplex still manufactures Micarta and produces over 100 different versions of Micarta offered in sheet, tube, and rod forms. *Norplex-Micarta Industrial Composites

See also

• Composite epoxy material
• FR-4, epoxy-fiberglass PC board laminate for printed circuit boards, which has largely replaced micarta for the purpose.

References

• American Machinist (Trade Journal): Micarta is a new insulating material developed by Westinghouse, American Machinist, New York, NY, United States, Thursday, July 17, 1913, vol. 39, no. 3, p. 122, col. 1-2

External links

• Norplex-Micarta Industrial Composites