Toughened glass insulators are manufactured by melting carefully proportioned raw materials, pressing the molten glass into shape, thermally toughening it, and assembling it with metal fittings. A glass insulator factory controls each stage to achieve consistent dimensions, mechanical strength and electrical performance.
Silica sand and other glassmaking ingredients are weighed and mixed according to a controlled formulation. The mixture is melted and refined to produce a uniform glass melt with minimal bubbles and inclusions.
Measured portions enter moulds, where pressing forms the glass shell. The mould defines the shed profile and dimensions. Products such as Tailun’s U70BS toughened glass suspension insulator require a defined profile and controlled dimensions for assembly.
The formed shells undergo temperature conditioning followed by rapid, controlled air cooling. This creates compression at the glass surface, improving resistance to mechanical and thermal stresses. Toughening differs from slow annealing, which primarily relieves internal stress.
Before assembly, shells undergo inspection and thermal screening to identify defects. Rejected pieces are removed before metal fittings are attached.
Accepted shells are assembled with a metal cap and steel pin using a suitable cementing material. Fixtures maintain alignment while the cement is placed and cured. Controlled positioning and curing help the assembled unit transfer mechanical loads reliably between its fittings and glass body.
Finished units undergo routine checks, including applicable mechanical testing. Sample and type tests are separate activities specified by the relevant standard and purchase requirements. For AC overhead-line applications, IEC 60383-1 covers ceramic or glass insulator units, test methods and acceptance criteria.
Accepted insulators are marked and packed for shipment. Buyers should confirm the ordered model, applicable test documentation and packaging requirements before dispatch.
