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What are the porcelain stay insulator materials and construction?

Porcelain stay insulator materials and construction shall follow insulator specifications. The insulator materials and construction shall be required by insulator tender.

porcelain stay insulator           

porcelain stay insulator

Porcelain stay insulator materials and construction requirements
◆ The insulating material shall be porcelain. The porcelain shall be sound, free from flaws and blemishes, thoroughly vitrified, smoothly glazed and of uniform brown colour when finished.
◆ The insulator shall be free from stresses due to expansion and contraction in any part which may lead to deterioration.
◆ The holes in the insulator shall be smoothly radiused with as large a radius as practicable to present an even bearing surface to the stay strand loop.

 

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