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・ Closed schools in the Northland Region
・ Closed session of the United States Congress
・ Closed sessions of the United States House of Representatives
・ Closed sessions of the United States Senate
・ Closed set
・ Closed shop
・ Closed subgroup theorem
・ Closed subscriber group
・ Closed system
・ Closed system (control theory)
・ Closed system drug transfer device
・ Closed testing procedure
・ Closed timelike curve
・ Closed User Group
・ Closed wing
Closed-cell PVC foamboard
・ Closed-circuit
・ Closed-circuit radio
・ Closed-circuit television
・ Closed-circuit television camera
・ Closed-cone pine forest
・ Closed-cycle gas turbine
・ Closed-end credit
・ Closed-end fund
・ Closed-end leasing
・ Closed-ended
・ Closed-ended question
・ Closed-eye hallucination
・ Closed-form expression
・ Closed-loop authentication


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Closed-cell PVC foamboard : ウィキペディア英語版
Closed-cell PVC foamboard

Closed-cell PVC foamboard is a lightweight rigid material used primarily in the manufacture of signs and displays. It is considered robust for outdoor use, being immune to rain and resistant to wind and sunlight.
==History==
In 1912, the first patents for PVC were founded in Britain and Germany. It was not until the early 1930s that PVC was able to be produced cheaply, limiting its marketable applications for the time. World War II helped make the substance popular, as manufacturers used it to make an assortment of items for soldiers. It was here that PVC’s water resistance was shown to be an important property, and tools made from PVC were used in many marine applications. After the war, PVC was not a popular choice of materials in the marine industry due to its density. In the 1970s, the need for a strong, moisture-resistant material led to plastic manufactures working with PVC to make it lighter. This led to the creation of PVC foamboard, by combining PVC with polyurea at the molecular level.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
ウィキペディアで「Closed-cell PVC foamboard」の詳細全文を読む



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