Electric Power Transformers: Oil-Resistant Gaskets for High-Voltage Bushings.

Electric Power Transformers: Oil-Resistant Gaskets for High-Voltage Bushings

Problem Statement

High-voltage bushings in electric power transformers require gaskets that resist mineral oil degradation, maintain sealing integrity under thermal cycling, and prevent compression set failure at pressures exceeding 10 MPa.

Material Science Analysis

Standard EPDM compounds fail due to swelling and chemical degradation in mineral oil. Fluorocarbon rubber (FKM) excels due to its high fluorine content (66-70%), which provides superior oil resistance and thermal stability. HNBR offers intermediate performance but lacks the long-term aging resistance of FKM.

Technical Specs

• Material: FKM (Fluorocarbon Rubber)
• Shore A Hardness: 75 ± 5
• Tensile Strength: 18 MPa
• Elongation at Break: 200%
• Temperature Range: -20°C to 200°C
• Compression Set (22 hrs @ 200°C): ≤ 20%

Material Comparison

Material	FKM	HNBR	EPDM
Oil Resistance (ASTM D2000)	Excellent	Good	Poor
Temperature Range (°C)	-20 to 200	-40 to 150	-50 to 120
Compression Set (%)	≤ 20	≤ 30	≤ 40
Chemical Resistance	High	Moderate	Low

Standard Compliance

RubberQ adheres to IATF 16949 standards for batch-to-batch consistency. Our FKM compounds meet ASTM D2000 and ISO 3601 specifications for oil-resistant sealing applications.

CTA

For custom material compound development or IATF 16949 documentation, consult RubberQ's engineering department.