For engineers and technical professionals involved in the design and manufacturing of high-voltage capacitors, a thorough understanding of the technical specifications of dielectric fluids is essential. Monobenzyl Toluene and Dibenzyl Toluene (M/DBT) insulating oil, a key component in modern capacitors, possesses a unique set of properties that dictate its performance and suitability. This article provides a detailed examination of these critical technical specifications, offering insights for procurement managers and engineers looking to buy or specify this advanced material from a reliable manufacturer and supplier.

Understanding the Core Technical Specifications of M/DBT Insulating Oil

The performance of M/DBT insulating oil is defined by a series of precisely measured parameters, often aligned with standards such as GB 21221-2007. For those in the market to buy, these are the key metrics to consider:

  • Appearance: Typically described as a colorless transparent liquid, the visual clarity indicates purity and consistency. Manufacturers strive to maintain this appearance through rigorous processing.
  • Density (20ºC): Measured between 0.980-1.020 g/cm³, density is important for fluid dynamics and volume calculations in capacitor design.
  • Acid Number: A very low acid number (≤0.015 mg KOH/g) signifies excellent resistance to oxidation, preventing the formation of corrosive acids that can degrade capacitor components over time. This is a critical factor for long-term reliability.
  • Flash Point: A minimum flash point of ≥135ºC indicates a high degree of safety and resistance to ignition, crucial for high-power electrical equipment.
  • Pour Point: An exceptionally low pour point (≤-60ºC) highlights the oil's ability to remain fluid in extremely cold conditions, ensuring effective impregnation and performance in diverse environments.
  • Kinetic Viscosity (40ºC): The viscosity of ≤4.0 mm²/s at 40ºC ensures that the oil can easily penetrate the dielectric material during impregnation and effectively transfer heat.
  • Breakdown Voltage: A high breakdown voltage of ≥70 KV (measured with spherical electrodes) is fundamental for providing robust electrical insulation, preventing arcing and short circuits.
  • Dielectric Dissipation Factor (tan δ) at 90ºC: A very low value (≤0.001) indicates minimal energy loss due to dielectric polarization, contributing to higher capacitor efficiency and reduced self-heating.
  • Electric Volume Resistivity at 90ºC: High resistivity (≥1.0*10¹² Ω.m) is a direct measure of the oil's insulating capability.
  • Relative Permittivity (εγ) at 90ºC: The value of 2.45-2.55 influences the capacitor's dielectric constant and energy storage capability.
  • Water Content: Kept to a minimum (≤50 mg/kg), as moisture significantly degrades dielectric properties.
  • Chlorine Content: Low chlorine content (≤30 mg/kg) is essential, as chlorine can contribute to corrosion.
  • Epoxy Content: Typically between 1.6-2.0 Mg HCI/g, this can be adjusted according to customer requirements, demonstrating the supplier's flexibility.

The Importance of Sourcing from a Qualified Manufacturer and Supplier

For procurement professionals aiming to buy M/DBT insulating oil, partnering with a reputable manufacturer and supplier like NINGBO INNO PHARMCHEM CO.,LTD. ensures access to these precise specifications and consistent quality. Benefits include:

  • Verified Specifications: A reliable supplier provides detailed Certificates of Analysis (CoA) for each batch, confirming that all technical parameters meet the stated requirements.
  • Technical Customization: The ability to adjust parameters like epoxy content demonstrates a supplier's commitment to meeting specific application needs.
  • Competitive Pricing: Direct sourcing from a manufacturer ensures competitive pricing, allowing businesses to manage their procurement costs effectively.
  • Reliable Supply: A supplier with substantial production capacity guarantees a consistent and timely supply, crucial for ongoing manufacturing operations.

In conclusion, understanding the detailed technical specifications of M/DBT insulating oil is vital for making informed purchasing decisions in the high-voltage capacitor industry. By prioritizing a partnership with a technically proficient and reliable manufacturer and supplier, engineers and procurement managers can ensure the selection of a dielectric fluid that delivers superior performance, reliability, and value.