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Fiberglass Rod for Polymer Insulator/4.15-220mm ECR Rod. Wide Diameter Range: Available from 4.15mm to 220mm with customizable options. Corrosion Resistance: Ideal for harsh environments with outstanding UV and weather resistance. Full Customization: Customize diameter, length, resin system, and surface treatment based on drawings. Strict Quality Testing: 100% inspection including mechanical, electrical, and thermal resistance tests. Global Manufacturer: Established in 2008 with 17 years of export experience and ISO certifications.