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Electromagnetic Flowmeters
Published in Michael A. Crabtree, The Concise Industrial Flow Measurement Handbook, 2019
Neoprene (polychloroprene or pc-rubber) is a versatile synthetic soft rubber originally developed as an oil-resistant substitute for natural rubber. Consequently, well-suited to wastewater applications (e.g. process water) where oil is present.
Particle Size
Published in David M. Scott, Industrial Process Sensors, 2018
Neoprene is an elastomer (synthetic rubber) used to manufacture a wide range of common items including mechanical belts, inner tubes, gloves, gaskets, garden hose, and plumbing fixtures. It is manufactured using an emulsion polymerization process in which an initiator is added to an emulsion of chloroprene in water. Variability in the emulsion affects the mechanical properties of the product, so control of the chloroprene droplet size distribution (DSD) is important. Measurement of the DSD is difficult because the emulsion is milky in appearance; moreover, chloroprene is a flammable solvent, so the instrument must be intrinsically safe.
Vacuum Materials, Hardware, Fabrication Techniques, Cleaning Processes and Surface Treatment
Published in Pramod K. Naik, Vacuum, 2018
high vacuum application. However, for UHV applications, stainless steel couplings with gaskets made of softer metals as shown in Fig. 9.2 can be used. Most of the demountable joints in high vacuum systems with pipe diameters generally exceeding 25 mm are of flanged type with elastomer O-rings. Most commonly used elastomer in vacuum practice is neoprene with shore hardness 60±5 units. Working temperature limits of neoprene are 30°C to 140°C. For making O-rings for use on large diameter flanged ports, it is convenient to make them from neoprene cord of circular cross section. For this purpose, the cord of the appropriate length is cut and its ends are glued together by using rubber vulcanizing solution and cured. Other materials for gaskets include Viton A, Teflon, butyl rubber, Buna N. Permeation rates, gassing rates and range of temperatures for use are important
Studies on properties of coated para-aramid fabric samples developed for military applications – post UVA-340 exposure
Published in The Journal of The Textile Institute, 2023
R. G. Revaiah, T. M. Kotresh, Balasubramanian Kandasubramanian
Neoprene is the choice of material for military applications when flame retardant properties are desired. Neoprene coating is generally employed on nylon-based substrates and used when air and waterproof applications are desired. In the present study, although, the base fabric used is inherently flame retardant, the coating was essential for air/water proofness. When Neoprene-coated fabric was exposed to UV radiation, subtle surface degradation (in the form of cracks) was noticed indicating that Neoprene is more resistant to UV degradation compared to natural rubber. The mechanism (Figure 5) of UV degradation becomes more complex than natural rubber due to presence of chlorine atom adjacent to double bond and UV degradation proceeds with hydrogen abstraction leading to the formation of three possible radicals in the vicinity of double bond (Adam et al., 1991).