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Ceramic insulators value.
Link to other types of insulators.
Ceramic is less expensive to produce than porcelain.
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In the 1950s electrical companies transitioned to porcelain insulators.
Once it s shaped it is fired between 2 100 to 2 300 fahrenheit.
In the mid 1960 s a few people began collecting these glass and porcelain insulators.
Today there are over 2000 collectors and insulator clubs national shows and good reference books are available.
From 1920 to 1950 there was a peak in the manufacture of glass insulators.
As technology developed insulators were needed for telephone lines electric power lines and other applications.
Return to the national insulator association page.
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Similar to their glass counterparts porcelain insulators date back to before the civil war for telegraph wires.
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Must have new guide book too for u chart and u numbers value guide can not be used by itself alone without the guide book value guide 3rd edition for unipart and multipart porcelain insulator.
Glass insulators were first produced in the 1850 s for use with telegraph lines.
Ceramic is made of red brown or white porous clay.
Vintage insulators are most commonly made out of porcelain or glass materials and they come in a wide variety of colors and shapes making each item a unique piece that can make a great addition to a collection.
The 126 page value guide lists manufacturer marking catalog number color rarity and value for 4354 different unipart pin type styles and 1201 different multipart pin type styles.
Collecting insulators is a fun and unique hobby that will allow you to learn much about the history and make of these unique objects.
In north america glass was always the predominate material for communications insulators but porcelain has become the standard for power distribution due to its greater strength and surface resistance.
Insulators were originally designed to keep the wires linking telegraphs and telephones insulated from the wooden poles that held them aloft.
This increased the need for the glass insulator and more companies sprang up in response to the need.
This transition was complete by the 1970s.
Most of the insulators available today come from this era.