The Difference Between Malleable and Cast Iron Door Hardware.Written by Ali Arnold
There is often confusion about difference between malleable iron and cast iron hardware. There are many cheaper cast iron products for sale now, many of which are identical in size, shape and general appearance to quality door and window hardware. The difference is that cast iron will break.Kirkpatrick Ltd for Walsall in UK, has been synonymous with production of high quality malleable iron builders's ironmongery for over 140 years. Producing an extensive range of Black Antique and Plain Gothic styles. Kirkpatrick's malleable iron products are hand-made in their foundry in Walsall using green sand casting process. At this stage castings are hard and brittle and cannot be hammered, so they are subjected to a heat treatment known as 'annealing'. In this process castings are surrounded by an inert haematite ore within iron drums and loaded into ovens of six to eight tons capacity. The ovens take about two days to reach annealing temperatue of 980 C. The castings are then soaked at this temperature for around 80 hours, after which they are allowed to cool naturally. During this process carbon structure of iron is changed. The resulting castings are no longer hard and brittle, but soft and malleable.
| | The History of Super GlueWritten by T.Going
The History of Super GlueI’m sure many of you have already wondered where super glue came from. In past there have been urban legends that described super glue as an ‘accidental solution’ to battle wounds during World War II, but actual evolution is slightly different. In 1942 original cyanoacrylates (chemical name) were discovered while searching for materials that could make clear plastic gun sights for war. While searching for these materials, scientists came upon a formulation that stuck to everything it came into contact with. These cyanoacrylates were rapidly rejected by American researchers for sole reason that they stuck to everything they came in contact with. It wasn’t until 9 years later that these cyanoacrylates were rediscovered by researchers from Eastman Kodak. Fred Joyner and Harry Coover recognized true potential for these cyanoacrylates and it was first sold as a commercial product in 1958. Since then Super Glue has evolved into several other great products, and continues to grow even to this day.
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