Business Management

Author: Haroon Khalil

  • Types of Paints

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    Haroon Khalil
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    Various types of paints are discussed below: 1. Oil Paint The various constituents of an oil paint are discussed in Section 12.2.4. These paints are self-priming and in general do not need any special primer or undercoat. When it is used for general decoration purposes, it is a common practice to apply at least three…

  • Characteristics of a Good Paint

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    Haroon Khalil
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    An ideal paint should possess the following qualities:

  • Constituents of an Oil Paint

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    Haroon Khalil
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    Metals and wooden surfaces are generally painted by oil paints. Sometimes walls are also painted by oil paints. Thus, it is worth discussing the constituents of an oil paint. An oil paint is made up of six main constituents, viz., base, inert filler, colouring pigment, vehicle, thinner and drier. 1. Base The base forms the…

  • Functions of Paints

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    Haroon Khalil
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    Irrespective of the type of paint, in general, the functions of paints are as follows:

  • PAINTS

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    Haroon Khalil
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    Paint is mainly composed of two ingredients, viz., a base which is a solid material and a liquid called a vehicle. The vehicle carries the solid matter, distributes it evenly and enables the solid matter to adhere to the surface.

  • INTRODUCTION

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    Haroon Khalil
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    Apart from protecting various building units from the weathering action of the atmosphere, the main objective of surface finishing materials is to provide a decorative finish to obtain a clean, colourful and pleasing surface. Surface finishing materials are paints, varnishes, distempers and white/colour washing. The surfaces may be plastered wall surfaces, ceilings, wooden surfaces, metallic…

  • Nickel Alloys

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    Haroon Khalil
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    Important nickel alloys are iconel and monel metals. The composition of iconel is 75% nickel, 15% chromium and 9% iron. Monel metal comprises two-thirds nickel, one-thirds copper with a small percentage of elements like iron, silicon, manganese and carbon. Iconel can be cast, forged, rolled and cold drawn. It has brittle behaviour when the temperature…

  • Magnesium Alloys

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    Haroon Khalil
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    Magnesium alloys comprise 3–10% aluminium, 1–3.8% zinc and 0.4% manganese. The two important magnesium alloys are dow metal and electron metal. Dow metal comprises 9.1% magnesium and 9% aluminium. Electron metal, a trade name of magnesium, is a base alloy that contains 4% zinc and small percentages of copper, iron and silicon. The tensile strength…

  • Aluminium Alloys

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    Haroon Khalil
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    Principal elements that are alloyed with pure aluminium to improve its tensile strength and hardness are copper, silicon, manganese, zinc, magnesium and nickel. Copper is the main hardening element for aluminium alloy by the addition of a small percentage of magnesium, which improves the hardness and strength after heat treatment. Similarly, the addition of a…

  • Copper Alloys

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    Haroon Khalil
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    Two important principal classes of copper alloys are brass and bronze. Brass is primarily an alloy of copper and zinc, whereas bronze is a combination of copper and tin. Brasses are formed with 5–45% of zinc and copper. Brasses possess excellent mechanical properties. They are corrosion resistant and are readily machinable. The mechanical properties of…