The majority of nylons tend to be semi-crystalline and are generally very tough materials with good thermal and chemical resistance. The different types give a wide range of properties with specific gravity, melting point and moisture content tending to reduce as the nylon number increases.


Nylon 6

Fibres are tough, possessing high tensile strength, as well as elasticity and lustre. They are wrinkle proof and highly resistant to abrasion and chemicals such as acids and alkalis. ... The glass transition temperature of Nylon 6 is 47 °C.


Nylon 66

Material with a higher mechanical strength, stiffness, heat and wear resistance than Ertalon 6 SA. It also has a better creep resistance but its impact strength and mechanical damping ability is reduced. Well suited for machining on automatic lathes.



2 High Density Polyethylene (HDPE) pipe shall comply with AWWA Specifications C906. 2.1. ... HDPE pipe shall have a minimum density of 0.955 grams per cubic centimeter. All HDPE pipe and fittings shall have a Hydrostatic Design Basis (HDB) of 1,600 psi.



LDPE is defined by a density range of 917-930 kg/m3. It is not reactive at room temperatures, except by strong oxidizing agents, and some solvents cause swelling. It can withstand temperatures of 80 °C continuously and 90 °C (194 °F) for a short time.



Bronze is a Copper-Tin alloy. The casting alloy has tin content between 9-12%. Increasing Tin content decreases conductivity but increases the hardness. Bronze also form protecting layer on the surface of Copper oxide and Copper carbonate which protects underlying alloy from further corrosion. This makes bronze resistant to corrosion, wear, and seawater and offers good fatigue strength and excellent material for spring and sliding components. Bronze alloys with about 0.4 – 1 % Phosphorous are harder and usually called Phosphorous Bronze.



Gunmetal is a Copper-Tin-Zinc alloy. Gunmetal alloys approximately contain Tin 2-11% and Zinc 1-10%. Modified alloys of Gunmetal, Leaded gunmetal and Nickel gunmetal, contains Lead up to 7% and Nickel up to 6% respectively. Gunmetal alloys are frequently used for bearings with moderate speed and load and specially where pressure tight castings required for valves, pipe fittings and pumps.


Leaded Bronze

Leaded Bronze is a Bronze alloy with a higher Lead contents. It has very good sliding and emergency running properties and being used in mechanical engineering. Leaded bronze alloys offer excellent wear resistance (also against not perfectly smooth and soft shaft) and machineability therefore used for manufacturing of bearings and bushes-plain bearings.


Aluminium Bronze

Aluminium Bronze is Copper-Aluminium alloy where Aluminium (5-11%) is the main alloying element added to Copper. Aluminium bronze alloy has higher strength and corrosion resistant compare to other bronze alloys. They form tough layer of Aluminium oxide on the surface which gives them higher corrosion resistance. It makes them preferable to other engineering materials and their applications includes Bushes (plain bearings), valve components, underwater fastenings, ship propellers and also used in engine components because of their low reactivity to sulphurous compounds and other combustion exhaust products.

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