Advantages And Disadvantages Of Polyester: Advantages And Disadvantages?

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ADVANTAGES FOR THERMOSETTING POLYMER Epoxy Epoxy can bond strongly to most materials including metals, concrete, glass, ceramics, stone, wood and leather. Exceptions are plastics materials like polyethylene, polypropylene, Teflon and so on. It is low viscosity and very little shrinkage on curing, which makes it suitable to be used to produce reinforcement fibers and providing good dimensional stability. Besides that, epoxy has an excellent water, heat and chemical resistance. It has an excellent adhesion as well, hence their modification as epoxy glues. It also has very good electrical insulating properties. Epoxy has outstanding mechanical strength including tensile, compressive, and modulus. Polyester The benefit of polyester is it has…show more content…
Many epoxy hardeners are known to bring on health problems, most notably in the form of dermatitis and allergies, and rigorous health provisions are therefore necessary. Some epoxy cannot be used in moist environments. Some have strong order prior to polymerization. Polyester The main drawbacks of epoxy are low temperature tolerance and UV tolerance. Other than that, it is significant shrinkage from crosslinking, and notable health problems. It is not recyclable and has a long processing…show more content…
Polyethylene is an ideal material to use in the construction of piping. Polyethylene is categorized according to their density and molecular structure. Ultra-high molecular weight polyethylene (UHMWPE) is tough and resistant to chemicals. It is used to manufacture moving machine parts, bearings, gears, artificial joints and some bulletproof vests. Besides that, high-density polyethylene (HDPE) is recyclable plastic which commonly used as milk jugs, liquid laundry detergent bottles, outdoor furniture, margarine tubs, portable gasoline cans, drinking water distribution systems, water drainage pipes, and grocery bags. Medium-density polyethylene (MDPE) is used for packaging film, sacks and gas pipes and fittings. Low-density polyethylene (LDPE) is flexible and is used in the manufacture of squeeze bottles, milk jug caps, retail store bags and linear low-density polyethylene (LLDPE) as stretch wrap in transporting and handling boxes of durable goods, and as the common household food covering. Cross-linked polyethylene is a semi-rigid, flexible material which has gained wide use in cold or hot water building heating and cooling applications (hydronic heating and cooling) due to its exceptional resistance to breakdown from wide temperature

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