From around 1915 on the porcelain insulator virtually replaced glass on all electrical distribution even at low voltages as the superiority was demonstrated in both insulation quality and strength.
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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.
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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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Peirce 355 electric insulator brown porcelain ceramic cindysinternetattic.
To compete some glass companies hemingray and whitall tatum tried to mimic porcelain with amber insulators in the 1930 s and 1940 s.