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Mercerized Materials:
Mercerized materials. Materials that have a lustrous surface produced by subjecting the material to a chemical process. The cloth is treated in a cold caustic alkali Bath while held in a state of tension. By this treatment the yarn is changed from a flat ribbon-like shape to a rounded form, making the cloth more lustrous, more durable, and more susceptible to dye. Mercerized cotton has a silky appearance. The process is called after its originator, John Mercer, an English calico printer.
Metal cloth. A fabric the surface of which has a metallic appearance. It is made by weaving cotton warp threads with tinsel filling yarns. The latter are made by next to the United States in quantity production. There are many different grades that depend upon the natural color, length, softness, and crimpiness of the fiber. There are over two hundred kinds of cloth that can be made from cotton. The spun thread is usually dull and limp, though it can be given a glossy appearance by mercerizing. Examined under a strong microscope, the thread reveals that it is spirally twisted, and when tightly spun has greater strength than wool. Cotton reflects heat to a greater extent than wool or silk but less than linen or rayon. It suffers little from laundering, and stands boiling water and mild cleaning alkalies without serious detriment. Continuous exposure to sunlight causes it to disintegrate. Cotton is particularly used for draperies, upholstery, and slipcovers.a General All materials subject to test and inspection, intended for use in boilers and machinery of vessels classed or proposed for classification, are to be tested and inspected by the Surveyor in accordance with the following requirements or their equivalent. Materials having characteristics differing from those prescribed herein require special approval for each application of such materials and the physical tests may be modified to suit conditions as approved in connection with the design.
The subunits themselves must either be pumped into the cell from the surrounding environment or fabricated from still simpler raw materials received from the environment. Therefore, the length of the lag phase is governed by the time it takes the cells to stock up on these critical supplies. If the nutrient medium is rich in the needed raw materials, the raw materials can be pumped quickly into the cell, and cell division can start promptly. If the nutrient medium is poor, the cells take a much longer time to store up the threshold concentrations of the necessary raw materials.
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