Everything about Pitch Resin totally explained
Pitch is the name for any of a number of highly
viscous liquids which appear
solid. Pitch can be made from
petroleum products or plants. Petroleum-derived pitch is also called
bitumen. Pitch produced from plants is also known as
resin. Products made from plant resin are also known as
rosin.
Tar pitch appears solid, and can be shattered with a hard impact, but it's actually fluid. Pitch flows at room temperature, but extremely slowly. The
pitch drop experiment taking place at
University of Queensland is a long-term experiment which measures the flow of a piece of pitch over many years. For the experiment, pitch was put in a glass container with a hole in the bottom, and allowed to slowly drip out. Since the pitch was allowed to start dripping in
1930, only eight drops have fallen. It was calculated in the 1980s that the pitch in the experiment has a viscosity approximately 100
billion (10
11) times that of water.
Pitch was traditionally used to help
caulk the seams of wooden sailing vessels (see
shipbuilding). It was heated, then put into a container with a very long spout. The word
pitcher is said to derive from this long spouted container used to pour hot pitch. Pitch was also used to
waterproof wooden containers, and is sometimes still used in the making of
torches.
Production
The heating (
dry distilling) of wood causes
tar and pitch to drip away from the wood and leave behind
charcoal. Birchbark is used to make particularly fine tar.
Tar and pitch are often used interchangeably. However, pitch is considered more solid while tar is more liquid. Traditionally, pitch for waterproofing buckets, barrels and small boats was drawn from pine.
Further Information
Get more info on 'Pitch Resin'.
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