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3240 Fiberglass Sheet is a high-performance electrical insulation laminate manufactured by impregnating alkali-free electronic-grade fiberglass cloth with epoxy resin, then curing it under precise high temperature and high pressure conditions. Meeting IEC60893-3:2003 and GB/T 1303.4-2009 standards, this B-class heat-resistant material (130°C continuous operating temperature) features excellent dielectric stability even in high-humidity environments, high mechanical strength for easy precision machining, and an ultra-low water absorption rate of only 0.09% after 24-hour water immersion. Available in thicknesses from 0.1mm to 100mm with standard sheet sizes and custom dimensions on request, it is widely used in motors, transformers, switchgear, lithium battery packs and industrial equipment to fabricate durable insulation accessories, structural supports and insulating spacers, delivering reliable performance both in humid conditions and transformer oil.
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