Ceramic Cross Arm Insulator SC-185

The insulators are made by bonding ceramic components with upper and lower metal attachments using adhesive. The contact areas between the ceramic components and metal attachments are padded with elastic washers. The bonding sections of the ceramic components feature structures such as sandblasting, knurling, and grooving for mechanical strength, anti-loosening, and anti-torsion. The ceramic surfaces are uniformly glazed white, and the metal attachments are coated with gray magnetic paint. The main structures of the ceramic components consist of hollow partition (penetrable) and solid (non-penetrable) structures. The bonded pillar insulators are generally of the solid non-penetrable structure, which reduces maintenance and testing work compared to the hollow partition structure. The ceramic components come in two shapes: multi-angled and less-angled. The multi-angled shape increases the surface distance and has better electrical properties than the less-angled shape. All products except the outer bonded pillar insulators that are being phased out are multi-angled. The internal bonding structure, where the metal attachments are glued into the ceramic holes, increases the insulation distance and improves electrical performance, while also reducing the space required for installation. However, due to the negative impact on mechanical strength, insulators with higher mechanical strength requirements should use the bonded assembly method (i.e., the upper attachments are internally bonded, and the lower attachments are externally bonded).