G10/FR4/G11/FR5 Threaded Rods

Description

SIDA’s G10/FR4/G11/FR5 threaded rods are engineered from premium-grade thermoset epoxy resin systems reinforced with woven glass fiber mat. Through a controlled high-pressure lamination process, these materials achieve a dense, non-porous structure that exhibits outstanding dimensional stability and mechanical integrity even in demanding environments.

The product family includes four distinct grades to match specific application requirements:

G10 (EPGC201/Hgw2372): Standard epoxy glass composite with excellent electrical and mechanical properties
FR4 (EPGC202/Hgw2372.1): Flame-retardant version of G10 meeting UL94 V-0 requirements
G11 (EPGC203/Hgw2372.4): Enhanced thermal performance for higher temperature applications
FR5 (EPGC204/Hgw2372.2): Flame-retardant version of G11 with superior heat resistance

Our threaded rods are precision-machined using diamond tooling from laminated sheets, ensuring accurate thread profiles and consistent quality. The machining process maintains the material’s dielectric integrity while delivering custom lengths and diameters according to customer specifications. These rods serve as critical insulation components in transformer assemblies, switchgear, and high-voltage equipment where both structural support and electrical isolation are required.

G10/FR4/G11/FR5 Threaded rods Technical Data Sheet

International Standard		IEC60893	EPGC 201	EPGC202	EPGC203	EPGC204
		DIN 7735	Hgw2372	Hgw2372.1	Hgw2372.4	Hgw2372.2
		NEMA	G10	FR4	G11	FR5
Properties		Unit	Value	Value	Value	Value
Physical properties	Density	g/cm3	1.9-2.1	1.9-2.1	1.9-2.0	1.9-2.0
	Colour	/	Green	Yellow/Green	Green	Yellow/Green
	Water absorption	％	0.07-0.16	0.07-0.16	0.07-0.16	0.07-0.16
Mechanical properties	Flexural Strength	Mpa	385-490	385-490	210	210
	Impact Strength	KJ/M2	110	110	33	33
	Rockwell Hardness	M	280-330	280-330	110	110
	Compressive Strength	Mpa	180-230	180-230	280-330	280-330
	Compressive Strength	Mpa	≥14	≥14	180-230	180-230
Electrical Properties	Electrical Strength	KV/mm	40	40	≥14	≥14
	Electrical Strength	KV	≥1011	≥1011	40	40
	Volume Resistivity	Ω.cm	≥1010	≥1010	≥1011	≥1011
	Volume Resistivity	Ω.cm	≥1010	≥1010	≥1010	≥1010
	Surface Resistivity	Ω	≥1010	≥1010	≥1010	≥1010
	Surface Resistivity	Ω	4.0-5.0	4.0-5.0	≥1010	≥1010
	Dielectric Constant 1MHz	/	4.0-5.5	4.0-5.5	4.0-5.0	4.0-5.0
	Dielectric Constant 1MHz	/	0.03-0.04	0.03-0.04	4.0-5.5	4.0-5.5
	Dielectric Constant 1MHz	/	0.04-0.05	0.04-0.05	0.03-0.04	0.03-0.04
	Dielectric Constant 1MHz		130-140	130-140	0.04-0.05	0.04-0.05
Flame Resistance		/	HB	V-0	HB	V-0

Note:The product specifications provided are for reference purposes only. Please refer to the actual product for final specifications. We also offer various sizes and thicknesses to meet your specific needs. For further customization, please contact us.

Key Features & Benefits

✓ International Standard Compliance: Fully certified to IEC 60893 (EPGC201-204), DIN 7735 (Hgw2372 series), and NEMA LI-1 standards
✓ Superior Mechanical Strength: High flexural and compressive strength provide reliable structural support in load-bearing applications
✓ Excellent Electrical Insulation: Maintains dielectric properties under high voltage and humidity conditions
✓ Temperature Versatility: B-class (130°C) and F-class (155°C) options accommodate diverse thermal requirements
✓ Flame Retardant Options: FR4/FR5 grades meet UL94 V-0 self-extinguishing standards for fire safety
✓ Chemical Resistance: Resistant to transformer oils, solvents, and most industrial chemicals
✓ Dimensional Stability: Low moisture absorption ensures minimal size variation in humid environments
✓ Cost-Effective Solution: Provides premium performance at competitive pricing for OEM applications
✓ Custom Machining: Precision threads, special diameters, and cut-to-length services available

Application Scenarios

1. Power Transformers & Distribution Equipment Used as through-bolts, tie rods, and clamping studs for transformer coil assembly. Provides mechanical clamping force while maintaining phase-to-ground insulation in oil-immersed and dry-type transformers up to 36kV.

2. Switchgear & Circuit Breakers Essential for securing busbar supports and arc chutes in medium-voltage switchgear. FR4/FR5 grades ensure flame retardancy during fault conditions while providing tracking resistance.

3. Electric Motors & Generators Serve as end-winding support studs and rotor balance bolts in high-voltage motors. Temperature class F G11/FR5 rods perform reliably in hot-spot areas up to 155°C.

4. Railway & Traction Systems Withstand vibration and thermal cycling in locomotive transformers and trackside equipment. Meets EN 45545-2 fire safety requirements when using FR grades.

5. Renewable Energy Systems Critical insulation in wind turbine converters and solar inverter cabinets. Resists UV degradation and salt-fog corrosion for outdoor installations.

6. Industrial Furnaces & HVAC Supports heating elements in industrial ovens while providing electrical isolation. High-temperature G11/FR5 grades prevent thermal degradation.

7. Test Equipment & Laboratories Used in high-voltage test fixtures and measurement apparatus where stable, low-loss insulation is mandatory.

Manufacturing & Quality Standards

SIDA’s production strictly adheres to international testing protocols:

IEC 60893-3: Industrial rigid laminated sheets based on thermosetting resins
NEMA LI-1: Standard for industrial laminated thermosetting products
DIN 7735: German standard for electrical laminated sheets
UL94: Flammability testing for plastic materials
RoHS & REACH: Compliant with environmental directives

Each batch undergoes:

100% Dimensional Inspection: Diameter, length, and thread pitch verification
Dielectric Withstand Test: 50kV DC for 1 minute per IEC 60893-3-2
Flammability Verification: UL94 V-0 testing for FR grades
Mechanical Sampling: Flexural and compressive strength validation

Certifications Available: ISO 9001, UL File E#####, RoHS Compliance Certificate

Frequently Asked Questions

Q: What’s the main difference between G10 and FR4 threaded rods? A: The primary difference is flammability. FR4 contains a brominated flame retardant additive that achieves UL94 V-0 rating (self-extinguishing within 10 seconds). G10 is non-flame-retardant (HB rating) but offers identical mechanical and electrical properties. Use FR4 where fire safety is critical.

Q: Can these threaded rods be used in oil-immersed transformers? A: Yes, all grades exhibit excellent compatibility with mineral transformer oils and synthetic esters. They show minimal swelling (<0.3%) after 1000 hours at 90°C in oil. G11/FR5 are recommended for high-temperature oil applications above 105°C.

Q: What’s the maximum continuous operating temperature? A: G10/FR4 are rated for Class B (130°C), while G11/FR5 are Class F (155°C). Short-term excursions up to 180°C are possible for G11/FR5, but sustained operation above rated temperature accelerates aging and reduces service life.

Q: Are custom thread sizes and lengths available? A: Absolutely. SIDA offers custom machining from M3 to M50 diameter in metric threads, and #6 to 2″ in UNC/UNF threads. Maximum length is 2000mm standard, with longer sections available upon request. Special shapes and drilled holes can be accommodated.

Q: How do these compare to phenolic rods? A: Epoxy-based G10/FR4/G11/FR5 offer superior mechanical strength (2x higher flexural strength), better moisture resistance (1/3 the water absorption), and higher temperature ratings than phenolic grades. However, they are 15-20% more expensive but provide longer service life.

Q: What storage conditions are recommended? A: Store in original packaging in a dry environment below 40°C and 50% relative humidity. Avoid direct sunlight. When stored properly, shelf life exceeds 5 years without property degradation.

Why Choose SIDA for Epoxy Glass Threaded Rods?

SIDA has been a trusted supplier of electrical insulation materials since 2005, serving OEMs in over 40 countries. Our in-house CNC machining center ensures ±0.1mm tolerance on all threaded rods, while our integrated supply chain reduces lead times to 2-3 weeks for custom orders. With UL-certified materials and comprehensive technical support, we help engineers select the optimal grade for their specific voltage, temperature, and mechanical requirements. Contact our technical team today for material samples and application-specific recommendations.