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Factory Price Transformer Winding DDP Insulation Paper. Diamond Dotted Design: Epoxy resin dots on both sides for enhanced dielectric and mechanical properties. Customization Available: Offers OEM service and custom branding options for 10 years. Strict Quality Control: Production based on retained samples to ensure consistency with sent samples. Free Sample Testing: Free samples available for quality testing, customer pays freight. Comprehensive Certifications: ISO9001, SGS, ROHS, and REACH certified for international markets. Custom Clearance Support: Assistance provided to find professional customs clearance companies. Factory Visit Welcome: Customers are always welcome to visit the manufacturing facility.