4 Inch Fin Tube Insulators

1: Winding angle, 45°~65° (winding angle can be adjusted according to different requirements to achieve better mechanical properties);

2: Fiber content (weight ratio), 70% to 75%;

3: Density, 2.00g/cm³;

4: Water absorption, less than 0.03%;

5: Axial thermal expansion coefficient, 1.8E-05 1/K;

6: Glass transition temperature, 110~120℃;

7: Chemical resistance Mineral oil: excellent;

8: Solvent and dilute acid: excellent;

9: Tensile elastic modulus, axial 14000 MPa;

10: Tensile strength: 280 MPa in the axial direction; 600 MPa in the circumferential direction;

11: Shear strength: 150 MPa;

12: Bending strength: axial 350 MPa;

13: Compressive strength: axial 240 MPa;

14: Relative dielectric constant 2-3.2;

15: Dielectric loss factor 0.003-0.015;

16: Partial discharge ≤5;

17: Dielectric strength: axial 3~6kv/mm; radial 10~12kv/mm;

18: Lightning shock: 110KV;

19: Power frequency shock: 50KV;

20: Heat resistance class: B, F, H;

21: inner diameter > 5mm; outer diameter < 300mm; length < 2000mm.

The above data is only for reference, the casing parameters we produce are customized for each customer's needs!

Contact available at : 

Jacky Shen - Sales manager 


  • Description

Product Name: 4-Inch Duct Insulation Sleeve

Product Description: The 4-inch duct insulation sleeve is an insulation material designed for use in HVAC systems. It is made from fiberglass reinforced material, providing excellent insulation and durability.

Key Features:

The duct insulation sleeve offers high insulation performance, effectively protecting the internal environment. It prevents loss of heat and cool air and enhances durability, ensuring it remains intact and free from deformation or aging during long-term use. The lightweight fiberglass material makes installation convenient. The product is manufactured using environmentally friendly materials that are harmless to human health and meet environmental requirements.


The 4-inch duct insulation sleeve is suitable for use in HVAC systems, residential buildings, offices, hospitals, schools, and other locations. It effectively protects the building's utilities such as water, electricity, and electrical facilities. It can also be used for retrofitting and upgrading existing systems.

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