Metal clothing fasteners

Fasten a cover of cardboard or cloth over the charge to keep the metal fragments from falling out of the container. 

In many countries, nickel is the commonest sensitizer in women, causing nickel allergy incidence to be high in a series of reported patch tests [399,400]. Since 1930, the emphasis has shifted from sensitization at work to sensitization in the home by nickel-plated metal and objects made of nickel alloy. The age of onset has altered to teenagers and young women and the source is now cheap metal jewellery and fasteners on clothing such as jeans studs. Also sensitization in infancy has been reported. Nickel-sensitive patients do not... 

Reaction of a Metal with Water. 1. Fill a test tube with water up to its edges. Close its mouth with your thumb, invert it in a bath with water and fasten it in this position in the clamp of a stand. Wrap up several pieces of metallic calcium in cheese-cloth and rapidly place the metal under the tube with pincers. Determine what gas is evolved. Write the molecular and electron equations of the reaction. 

Stud buttons are metal round discs pinched through the fabric. They are often found on clothing, in particular on denim pieces such as pants and jackets. They are more securely fastened to the material. As they rely on a metal rivet attached securely to the fabric, stud buttons are difficult to remove without compromising the fabric s integrity. They are made of two couples the male stud couple and the female stud couple. Each couple has one front (or top) and rear (or bottom) side (the fabric goes in the middle). 

Finally, what is often the key consideration adhesive bonding may be faster and cheaper than the weaving of cloth soldering, brazing or welding of metals or mechanical fastening of rivets, bolts, or nails. 

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