Fibreglass Sleeve ( China Sleeve )

Product Description

Fiberglass Sleeve (China Sleeve)

Fiberglass Sleeve, also popularly known as China Sleeve, is a high-quality insulating product made from braided fiberglass yarn. To improve its electrical and thermal performance, the base fiberglass is coated with insulating materials such as varnish, PVC, or silicone. This combination provides excellent protection against heat, electricity, and mechanical damage, making it a preferred choice for motors, transformers, wiring harnesses, and various electrical assemblies.

Construction

• Base material: Braided alkali-free fiberglass yarn

• Coating:

  • Varnished type high dielectric strength, heat class B (130C), F (155C), or H (180C)

  • PVC coated type smooth surface, flexible, economical, temperature range -40C to +125C

  • Silicone coated type high thermal endurance, flexible, temperature range up to 200C continuous

• Available colors: White, black, yellow, red, or as per requirement

• Sizes: Wide range of diameters (0.5 mm to 25 mm or customized)

Technical Properties

• Dielectric Strength (Breakdown Voltage): 1.5 kV 7 kV depending on wall thickness

• Operating Temperature: -60C to +200C (based on coating)

• Max Withstanding Temperature: Up to 250C (short-term, silicone coated type)

• Tensile Strength: High mechanical strength with flexibility

• Thermal Conductivity: Low, excellent thermal insulation

• Surface Treatment: Smooth and uniform coating for easy installation

• Moisture & Chemical Resistance: Resistant to oil, solvents, and common industrial chemicals

Applications

Fiberglass Sleeves are widely used in:

• Electrical motors and transformers for insulation of winding leads and terminals

• Generators and coils to prevent electrical leakage and mechanical wear

• Wiring harnesses in appliances, automotive, and industrial machines

• Cables and connections for added protection against heat, abrasion, and electrical breakdown

• Panels and lighting equipment to ensure safe and durable wiring insulation

Advantages

• Excellent electrical insulation with long service life

• Superior thermal resistance suitable for high-temperature environments

• Flexible structure allows easy cutting and installation

• Protects wires from abrasion, oil, moisture, and heat

• Available in multiple grades and sizes to suit different applications

Common Name

Though technically called Fiberglass Sleeve, in general industry practice and local markets it is also referred to as China Sleeve.

Robust Insulation and Flexibility

Built from single braided fiberglass with a PVC or silicone extrusion, this fibreglass sleeve ensures outstanding electrical insulation up to 7 kV. Its structure grants high tensile strength and flexibility, enabling superior protection for delicate wires and cables in demanding environments. The sleeves low heat conductivity further promotes thermal insulation, safeguarding internal cable assemblies from excessive temperature fluctuations.


Convenient Installation and Wide Applications

Designed for ease, this sleeve is simple to cut and slide onto cables or windings, with an IP20 rating when used as cable insulation. Its adaptability allows for application in cable harnesses, electric motors, transformers, lighting fixtures, panels, and various industrial machinery. This makes it suitable for manufacturers, distributors, installers, and end-users alike.


Durability and Chemical Resistance

Coated in durable PVC or silicone, the sleeve resists oil, moisture, and chemical exposure commonly found in industrial and automotive contexts. The abrasion-resistant outer layer protects cables and wiring from mechanical damage and environmental stress, assuring longevity and reliability throughout its service life.