Dry-Type Bushings: Do not use any insulating fluids, relying solely on solid insulation materials. Proper maintenance and testing are crucial to ensure the. Cover screw threads to stop electrical current in its tracks and prevent short circuits. This barrier also extends the life of your assembly by preventing galvanic corrosion, which is when. Check each product page for other buying options. Made from different types of fibers—natural, synthetic, or advanced composites—these bushings offer unique combinations of.