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Polyester Film Insulation Paper 6521/6520. Excellent Dielectric Properties: High breakdown voltage up to 6.0 kV with strong mechanical strength. Flexible Composite Structure: Two-layer laminate bonding polyester film with fish paper for durability. Wide Thickness Range: Available in nominal thicknesses from 0.13mm to 0.50mm for various needs. High Tensile Strength: MD tensile strength up to 500 N/10mm width ensuring structural integrity. ISO9001 & SGS Certified: Manufactured under strict quality standards with verified certifications. Versatile Applications: Ideal for slot, interphase, and liner insulation in electric motors.