Koster class minesweeper
Encyclopedia
Koster class is a minesweeper
Minesweeper (ship)
A minesweeper is a small naval warship designed to counter the threat posed by naval mines. Minesweepers generally detect then neutralize mines in advance of other naval operations.-History:...

 class operated by the Swedish navy
Swedish Navy
The Royal Swedish Navy is the naval branch of the Swedish Armed Forces. It is composed of surface and submarine naval units – the Fleet – as well as marine units, the so-called Amphibious Corps .In Swedish, vessels of the Swedish Navy are given the prefix "HMS," short for Hans/Hennes...

. From 1982-1993 seven ships were constructed. Originally called "Landsords-class" five of the ships, Koster, Kullen, Vinga, Ven and Ulvön, went thrue massive upgrades 2007-2010 and received the new class name, Koster. Sweden plans to keep the five ships in service for another 15–20 years.

The ships are constructed of extremely hard PVC plastic
Polyvinyl chloride
Polyvinyl chloride, commonly abbreviated PVC, is a thermoplastic polymer. It is a vinyl polymer constructed of repeating vinyl groups having one hydrogen replaced by chloride. Polyvinyl chloride is the third most widely produced plastic, after polyethylene and polypropylene. PVC is widely used in...

that can withstand a mine blast and prevents magnetic mines to attach to the hull. The class is the only minesweeper in the world that has an advanced anti-air defence system.
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