Adhesive-backed Barley Paper / Coated Blue Shell Paper: High-temperature Resistant Insulation Paper & Sealing Gasket for Motor Maintenance and 18650 Lithium Batteries

Our double-layer barley paper (also known as blue shell paper) insulation sheet is a high-performance flexible composite material, engineered for demanding insulation needs in electrical equipment and lithium battery packs. Composed of cyan electrical insulation wood pulp paper and polyester film, bonded by acid-free adhesive, this two-layer structure combines the excellent insulation properties of wood pulp paper with the superior dielectric strength of polyester film. Designed with optional single-sided adhesive and a standard thickness of 0.2mm, it delivers reliable mechanical and electrical performance, making it an ideal choice for 18650 battery packs, motor maintenance, transformers, and low-voltage electrical equipment.

• Heat Resistance: Continuous working temperature up to 130℃, heat resistance grade E/B, no bubbling or adhesive flowing under high-temperature conditions.
• High-Voltage Resistance: Withstands 4000V voltage, effectively blocking electrical conduction and preventing short circuits.
• Mechanical Performance: Strong tensile strength, flexible for longitudinal and transverse bending, wear-resistant and durable for long-term use.
• Environmental & Physical Traits: Eco-friendly acid-free adhesive, non-toxic, thickness 0.2mm (customizable), no bubbling or glue bleeding.

• Superior Insulation & Voltage Resistance: 4000V high-voltage protection and 130℃ heat resistance ensure stable performance in harsh electrical environments, avoiding insulation failure.
• Flexible & Durable Composite Design: Combines wood pulp paper’s insulation and polyester film’s dielectric strength, with strong tensile force and bending flexibility for irregular surfaces and gaps.
• Adhesive-Backed Option for Easy Installation: Single-sided adhesive design enables peel-and-stick application, no extra tools or glue needed, improving assembly and maintenance efficiency.
• Flexible Procurement & Customization: Sold by the meter, width can be customized freely to fit different project needs; 0.2mm standard thickness, with optional thickness adjustment available.
• Eco-Friendly & Safe: Acid-free adhesive, non-toxic and eco-friendly, complying with global environmental regulations; no bubbling or glue flow, ensuring clean and safe application.
• Multi-Scene Versatility: Suitable for both battery insulation and electrical equipment maintenance, with wide applicability across industries.

This double-layer barley paper insulation sheet is widely used in low-voltage electrical equipment, lithium battery packs, and mechanical maintenance, including but not limited to:

Ideal for 18650 and other lithium battery packs – used as insulation gaskets between cells, sealing pads, or component separators to prevent short circuits and enhance battery safety.

Perfect for low-voltage motors and electrical appliances as slot insulation, gasket insulation, and inter-turn insulation; suitable for motor repair, transformer insulation protection, and enameled wire insulation wrapping.

Applied in electrical cabinets, electronic components, and automotive electronics as insulation spacers or gap-sealing materials, delivering reliable protection in various industrial scenarios.

For detailed quotations, samples, or customization inquiries, please reach out to our professional team. We reply within 24 hours to provide personalized solutions and technical support, helping you enhance battery safety and production efficiency.