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Q. What do you mean by Thermosetting plastics?
This plastic undergoes a number of chemical changes on heating and cure to infusible and practically insoluble articles. The chemical change is not reversible thermosetting plastics do not soften on reheating and can not be reworked. They rather become harder due to completion of any left-over polymerization reaction. Eventually, at high temperatures, the useful properties of the plastic get destroyed. This is called degradation. The commonest thermosetting plastics are: alkyds, epoxides, polyesters, phenolics and urea.
TEMPERING: The hardening treatment specified to steel raises the hardness but initiates internal stresses due to different cooling rates. The internal stresses are created al
Q. What are the role of Roads in design of a plant? Roads are an important part of the design of a plant, as they provide access and separation during normal operation as well
CO2 Welding CO2 Welding is a variation of GMAW. Here the inert gas is replaced by gas mixtures or carbon dioxide, which are chemically active. The carbon dioxide decomposes in
Explain the Creation Phase of radial drilling machine Objective: "To generate alternative methods for providing the function, through creative thinking, brainstorming and
Tropical geometric information of solids A face is surrounded by a set of vertices. Using the right-handed rule, the ordering of these vertices for describing a particular face
Calculate the whole reaction at block: A bar weighing 1 kg/m is bent at right angles into segments 0.60 m and 0.30 m long. It takes the position illustrated in Figure, while t
components of cim
Q. What do you mean by extrusion? • Extrusion is a process used to create objects of a fixed cross-sectional profile. A material is pushed or drawn through a die of the desir
which type of guideways are used in centerless grinding machine? which are the errors find in different guideways?
AIR TRANSPORTATION: Air transportation has grown rapidly all over the world and in India too. Its main advantages are speed, good safety record, military use, ability to serve
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