G10-TUBE · INSULATION SLEEVE TUBE
Rigid G10 Epoxy Fiberglass Tube for Flange Insulation and Electrical Equipment
NEMA G10 epoxy fiberglass tube is made of alkali-free glass fabric and bonded with epoxy resin, in heat rolling and tightening, baking and curing, with high mechanical property and stable electrical property in high humidity. It is suitable for being used as insulation structural parts of mechanical, electrical and electronic equipment, and as the isolation sleeve tube in flange insulation gasket kits. It has a high working temperature index up to 130 °C.
NEMA G10 epoxy fiberglass tube has high mechanical and electrical properties. It has good mating and punching properties. It conforms to EN60893/IEC893 Grade EPGC 201, DIN7735 Grade HGW2372, NEMA LI-1 Grade G10 and IS10192 Grade EP1.
A NEMA G10 epoxy fiberglass tube is a rigid insulation tube made of alkali-free glass fabric bonded with epoxy resin. The raw materials are rolled under heat, tightened, baked and cured into a fully cross-linked thermoset tube. The finished tube has high mechanical strength and stable electrical properties in high humidity, and is used as insulation structural parts of mechanical, electrical and electronic equipment.
In the flange insulation gasket industry, the NEMA G10 epoxy fiberglass tube is used as the isolation sleeve tube — the tube that sits inside each bolt hole of a flange insulation gasket kit. The G10 sleeve prevents the bolt shank from contacting the flange, breaking the electrical path through the bolt hole and preserving the cathodic protection of the pipeline. The same tube can be cut to length and used together with insulating washers, plated steel washers and a central flange insulation gasket to complete the isolation joint.
Because NEMA G10 is a non-brominated, non-flame-retardant grade of glass epoxy laminate, it is selected wherever high mechanical strength and stable electrical properties in high humidity are required. NEMA G10 epoxy fiberglass tube from Ningbo Kaxite is RoHS and REACH compliant to ensure reliability, safety and consistency.
The NEMA G10 epoxy fiberglass tube is produced in a wide range of diameters, wall thicknesses and lengths. Confirm the exact outside diameter, inside diameter, wall thickness and cut length on the enquiry — custom sizes to drawing are accepted.
8 mm to 810 mm
0.5 mm, 0.8 mm or more
10 m
130 °C
The NEMA G10 epoxy fiberglass tube has extremely high mechanical strength, good dielectric loss properties and good electric strength properties — both wet and dry. Compared with other insulation tube materials, NEMA G10 offers a combination of mechanical and electrical performance that is difficult to match.
High Mechanical Strength
Tensile strength of 45,000 psi and flexural strength of 75,000 psi — suitable for structural insulation parts that must carry mechanical load as well as electrical stress.
Stable Electrical Properties in High Humidity
Dielectric properties remain stable in high humidity because water absorption is only 0.1 % over 24 hours. This makes NEMA G10 epoxy fiberglass tube a reliable insulator in wet or humid environments.
Good Mating and Punching Properties
The cured G10 tube can be cut, machined, drilled and punched using standard tooling. Cut-to-length sleeves can be produced to drawing with tight tolerances on the outside diameter and wall thickness.
RoHS and REACH Compliant
NEMA G10 epoxy fiberglass tube from Ningbo Kaxite is RoHS and REACH compliant, ensuring reliability, safety and consistency for electrical and electronic equipment and for pipeline isolation joints.
The main difference between NEMA Grades G10 and FR4 is that FR4 is the fire-retardant grade of G10. FR4 is made with the same alkali-free glass fabric and epoxy resin as G10, but with a brominated flame-retardant additive. Because FR4 has the same mechanical and electrical properties as G10 plus a flame-retardant additive, FR4 can be safely substituted where G10 is called for, while G10 can never be substituted where FR4 is called for.
The table below lists the mechanical and thermal properties of the NEMA G10 epoxy fiberglass tube. These values are typical for the standard NEMA LI-1 G10 grade and are used for design verification and incoming inspection.
| Testing Item | Testing Method | Testing Unit | Testing Result |
|---|---|---|---|
| Density | ASTM D792 | g/cm³ | 1.8 – 2.0 |
| Water Absorption, 24 hrs | ASTM D570 | % | 0.1 |
| Tensile Strength | ASTM D638 | psi | 45,000 |
| Flexural Strength | ASTM D790 | psi | 75,000 |
| IZOD Notched Impact | ASTM D256 | ft-lb/in | 14 |
| Compressive Strength | ASTM D695 | psi | 65,000 |
| Coefficient of Linear Thermal Expansion | ASTM D696 | x10⁻⁵ in./in./°F | 0.55 |
| Max Operating Temperature | — | °C | 130 |
| Hardness | ASTM D785 | Rockwell M | M110 |
Because the NEMA G10 epoxy fiberglass tube combines high mechanical strength with stable electrical properties in high humidity, it is used in a wide range of electrical, electronic, mechanical and pipeline isolation applications.
The most common use of the NEMA G10 epoxy fiberglass tube in the flange insulation industry is as the isolation sleeve inside a flange insulation gasket kit. The G10 sleeve sits inside the bolt hole of the flange and prevents the bolt shank from contacting the flange faces, breaking the electrical path through the bolt hole. This preserves the isolation of the flange joint and protects the cathodic protection system on a buried or submerged pipeline.
NEMA G10 epoxy fiberglass tube is used as insulation structural parts of mechanical, electrical and electronic equipment — including transformer insulation, switchgear parts, busbar supports, terminal boards and precision insulation spacers. The combination of high mechanical strength and stable electrical properties in high humidity makes G10 the standard material for these applications.
What is a NEMA G10 epoxy fiberglass tube?
A NEMA G10 epoxy fiberglass tube is a rigid insulation tube made of alkali-free glass fabric bonded with epoxy resin. It is produced by heat rolling, tightening, baking and curing. The finished tube has high mechanical strength and stable electrical properties in high humidity, and is used as insulation structural parts of mechanical, electrical and electronic equipment and as the isolation sleeve tube in flange insulation gasket kits. Maximum operating temperature is 130 °C.
What is the difference between G10 and FR4?
The main difference between NEMA Grades G10 and FR4 is that FR4 is the fire-retardant grade of G10. FR4 can be safely substituted where G10 is called for, because it has the same mechanical and electrical properties plus a flame-retardant additive. G10 can never be substituted where FR4 is called for, because G10 is non-brominated and non-flame-retardant.
What sizes are available for the NEMA G10 epoxy fiberglass tube?
The NEMA G10 epoxy fiberglass tube is available with a diameter range from 8 mm to 810 mm, a wall thickness from 0.5 mm or 0.8 mm and up, and a maximum length of 10 m. Custom diameters, wall thicknesses and cut-to-length tubes are available to customer drawing.
What standards does the NEMA G10 epoxy fiberglass tube meet?
The NEMA G10 epoxy fiberglass tube complies with EN60893/IEC893 Grade EPGC 201, DIN7735 Grade HGW2372, NEMA LI-1 Grade G10 and IS10192 Grade EP1. It is RoHS and REACH compliant.
What are the physical properties of the NEMA G10 epoxy fiberglass tube?
Density 1.8–2.0 g/cm³ (ASTM D792). Water absorption 0.1 % over 24 hrs (ASTM D570). Tensile strength 45,000 psi (ASTM D638). Flexural strength 75,000 psi (ASTM D790). IZOD notched impact 14 ft-lb/in (ASTM D256). Compressive strength 65,000 psi (ASTM D695). Coefficient of linear thermal expansion 0.55 x10⁻⁵ in./in./°F (ASTM D696). Maximum operating temperature 130 °C. Hardness M110 Rockwell M (ASTM D785).
What is the NEMA G10 epoxy fiberglass tube used for?
The NEMA G10 epoxy fiberglass tube is used as the isolation sleeve tube in flange insulation gasket kits, where it prevents the bolt shank from contacting the flange and breaks the electrical path through the bolt hole. It is also used as insulation structural parts of mechanical, electrical and electronic equipment that require high mechanical strength and stable electrical properties in high humidity.
Send us your specification — we reply within 24 hours
Tell us the outside diameter, the inside diameter or wall thickness, the required length, the quantity, the standard (NEMA LI-1 G10, EPGC 201, HGW2372 or EP1) and whether the tube is for a flange insulation gasket kit or for mechanical / electrical equipment insulation. If you are not sure whether G10 or FR4 is the correct grade for your application, send us the drawing and the operating conditions and we will match the correct material.
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