Dow Launches High-Performance XIAMETER™ PMX-561 Transformer Liquid, Setting New Benchmarks for Power Safety and Equipmen

Dow Launches High-Performance XIAMETER™ PMX-561 Transformer Liquid, Setting New Benchmarks for Power Safety and Equipment Reliability

Dow, a global leader in materials science, today announced the launch of XIAMETER™ PMX-561 Transformer Liquid under its XIAMETER™ brand.​ This polydimethylsiloxane (silicone) insulating fluid is engineered to meet the most stringent safety standards and demanding operating conditions, aiming to assist transformer manufacturers and power system operators in addressing the escalating challenges posed by dense urbanization, renewable energy integration, and extreme climates. PMX-561 combines outstanding fire safety, wide-temperature stability, and excellent environmental properties, offering an ideal insulating and cooling medium for the development and application of next-generation, high-safety, high-reliability transformers.

Superior Fire Safety, Meeting the Highest K3 Class Standard

Fire safety is a paramount consideration for electrical equipment, especially those installed underground, indoors, or in densely populated areas. XIAMETER™ PMX-561 Transformer Liquid boasts a high open-cup fire point of 370°C, significantly exceeding the International Electrotechnical Commission (IEC) 1100 standard requirement for K3 class insulating fluids (minimum 330°C). Simultaneously, compared to other fluids in its class, it features a lower net calorific value, meaning it releases heat more slowly and controllably in the event of an incident. This characteristic makes it an ideal choice for high-risk or space-constrained applications such as urban rail transit, data centers, commercial complex substations, and offshore platforms, substantially reducing fire hazards and enhancing public safety standards.

Stable Operation Across a Wide Temperature Range, Ensuring All-Weather Reliability

Modern grids and industrial applications demand transformers to operate reliably across a broad spectrum from extreme cold to intense heat. PMX-561 has a pour point below -50°C, ensuring equipment can start smoothly and maintain fluidity of the insulating liquid in frigid regions, preventing solidification. Its high thermal stability and oxidation resistance (with a typical neutralization number of only 0.008 mgKOH/g) ensure the fluid resists aging, decomposition, or the formation of acids and sludge under prolonged high-temperature operation, thereby protecting the transformer's solid insulation materials (e.g., paper, pressboard) and metallic components, significantly extending equipment service life. This is crucial for power stations in desert or tropical regions, as well as for traction and rectifier transformers operating under continuous heavy loads.

Excellent Electrical Performance and Environmental Profile, Geared for the Future Grid

Beyond its physio-chemical properties, PMX-561 excels in electrical performance. Its breakdown voltage is as high as 50 kV, dielectric dissipation factor (tg δ) at 90°C is as low as 0.0005, and volume resistivity reaches 1.0 x 10¹⁴ ohm·cm, ensuring stable and efficient insulation under high voltage, minimizing energy loss.

Environmentally, the product is halogen-free and classified as non-hazardous, presenting a relatively lower environmental impact throughout its lifecycle. It is compatible with various solid insulating materials, and Dow provides comprehensive guidelines for recycling and disposal, supporting the responsible handling of used silicone oil, such as energy recovery as fuel in industrial kilns, aligning with global sustainability trends.

Broad Application Scenarios, Empowering Diverse Markets

• Urban Power Grids: Underground substations, substations within high-rise buildings, where its high fire point meets stringent building fire codes.
• Rail Transportation: Traction power transformers for subways and high-speed rail, maintaining thermal stability under frequent start-stop cycles and冲击负载.
• Renewable Energy: Offshore substation transformers for wind farms, tolerating salt spray, high humidity, and wide temperature variations.
• Industrial Sector: Heavy-duty rectifier transformers and arc furnace transformers in industries like steel, smelting, and chemicals, addressing localized overheating challenges.
• Special Climate Regions: Transmission and distribution transformers used in extremely cold or hot regions, ensuring year-round, uninterrupted reliable power supply.

Dow Recommendations and Support

Dow recommends that equipment for handling PMX-561 be dedicated where possible, and systems be thoroughly cleaned during fluid changes to prevent cross-contamination for optimal performance. The product has a shelf life of up to 36 months when unopened and stored below 60°C. Dow provides comprehensive technical support and product stewardship services to global customers, ensuring the safe and effective application of the product.

"As the global energy transition and grid modernization accelerate, unprecedented demands are being placed on the safety, reliability, and environmental friendliness of electrical equipment," stated a relevant Dow business leader. "The launch of XIAMETER™ PMX-561 Transformer Liquid is a direct result of our response to market needs. We are confident that this product can help our customers design and operate safer, more durable, and more sustainable power infrastructure, collectively building a more resilient energy future."