Global Oil Duct Struct Market Growth 2026-2032
Description
The global Oil Duct Struct market size is predicted to grow from US$ 76.60 million in 2025 to US$ 126 million in 2032; it is expected to grow at a CAGR of 7.4% from 2026 to 2032.
Oil Duct Spacer Strips (often grouped as duct-spacing presspaper, axial strips and radial spacer strips) are cellulose-based transformer spacing elements used inside oil-immersed transformer windings to hold clearances and create/maintain oil ducts for cooling and dielectric performance. In practice, axial strips help maintain consistent oil ducts and support spacers, while radial spacer strips help space windings; together they form a stable spacing system in the coil.
Upstream materials are mainly transformer presspaper/pressboard (transformerboard) made from high-purity cellulose and processed for electrical insulation; these paper/board materials are standardized in industry under IEC frameworks for presspaper/pressboard. Some variants are additionally compacted for dimensional stability or supplied one-side coated / uncoated depending on the insulation system design. Downstream demand is primarily from liquid-filled power transformers, distribution transformers, and traction transformers.
In 2025, global sales of Oil Duct Spacer Strips reached approximately 9,636 tons, with an average global market price of around US$ 8,126/ton. Production capacity varies significantly among manufacturers, with gross profit margins ranging from approximately 20% to 35%.
Oil duct spacer strips are critical cellulose-based spacing elements inside liquid-filled transformer windings, primarily used to form and maintain cooling ducts while providing mechanical support. Demand largely tracks transformer build and replacement cycles. As grid expansion, renewable integration, and load growth from electrification place more pressure on delivery schedules and reliability, the transformer supply chain has been under strain, which in turn elevates the importance of qualified insulation components that can be delivered consistently and on time. Even though these parts are small in cost share, their dimensional stability and oil-duct consistency can materially affect thermal performance and long-term risk, making them “small but critical” items in transformer manufacturing.
On the supply side, competition is shifting from selling base presspaper/pressboard to offering value-added, drawing-based machined parts and kits. Higher-density pre-compressed pressboard, calibrated thickness, low shrinkage, and strong oil compatibility—combined with tighter tolerances, rounded edges, controlled dryness, and clean packaging—are increasingly decisive. Qualification discipline, repeatability in machining, and global footprint for OEM support form high barriers for new entrants.
Key risks include volatility in pulp and energy inputs, capacity tightness that amplifies lead-time and inventory pressures, and selective substitution by aramid papers, composites, or alternative structural designs in certain insulation systems. Overall, the segment is positioned for steady expansion alongside ongoing grid investment and transformer renewal, with further consolidation toward suppliers that can meet stricter quality, traceability, and delivery requirements.
LP Information, Inc. (LPI) ' newest research report, the “Oil Duct Struct Industry Forecast” looks at past sales and reviews total world Oil Duct Struct sales in 2025, providing a comprehensive analysis by region and market sector of projected Oil Duct Struct sales for 2026 through 2032. With Oil Duct Struct sales broken down by region, market sector and sub-sector, this report provides a detailed analysis in US$ millions of the world Oil Duct Struct industry.
This Insight Report provides a comprehensive analysis of the global Oil Duct Struct landscape and highlights key trends related to product segmentation, company formation, revenue, and market share, latest development, and M&A activity. This report also analyzes the strategies of leading global companies with a focus on Oil Duct Struct portfolios and capabilities, market entry strategies, market positions, and geographic footprints, to better understand these firms’ unique position in an accelerating global Oil Duct Struct market.
This Insight Report evaluates the key market trends, drivers, and affecting factors shaping the global outlook for Oil Duct Struct and breaks down the forecast by Type, by Application, geography, and market size to highlight emerging pockets of opportunity. With a transparent methodology based on hundreds of bottom-up qualitative and quantitative market inputs, this study forecast offers a highly nuanced view of the current state and future trajectory in the global Oil Duct Struct.
This report presents a comprehensive overview, market shares, and growth opportunities of Oil Duct Struct market by product type, application, key manufacturers and key regions and countries.
Segmentation by Type:
Axial Strips
Radial Spacer Strips
Duct Spacing Presspaper
Segmentation by Manufacturing Route:
Milled/Machined Strips
Calibrated Strips
Compacted Presspaper
Segmentation by Profile:
Rectangular Strips
Dovetail Strips
T-strips
Segmentation by Application:
Oil-filled Transformers
Traction Transformers
Other
This report also splits the market by region:
Americas
United States
Canada
Mexico
Brazil
APAC
China
Japan
Korea
Southeast Asia
India
Australia
Europe
Germany
France
UK
Italy
Russia
Middle East & Africa
Egypt
South Africa
Israel
Turkey
GCC Countries
The below companies that are profiled have been selected based on inputs gathered from primary experts and analysing the company's coverage, product portfolio, its market penetration.
Hitachi Energy
Weidmann Electrical Technology
KREMPEL
Nantong Zhongling Electric Power Technology
Henan YAAN Electrical Insulation Plant
Shandong Jinbao Electrical
Shenyang Defeng Insulation Materials
Key Questions Addressed in this Report
What is the 10-year outlook for the global Oil Duct Struct market?
What factors are driving Oil Duct Struct market growth, globally and by region?
Which technologies are poised for the fastest growth by market and region?
How do Oil Duct Struct market opportunities vary by end market size?
How does Oil Duct Struct break out by Type, by Application?
Please note: The report will take approximately 2 business days to prepare and deliver.
Oil Duct Spacer Strips (often grouped as duct-spacing presspaper, axial strips and radial spacer strips) are cellulose-based transformer spacing elements used inside oil-immersed transformer windings to hold clearances and create/maintain oil ducts for cooling and dielectric performance. In practice, axial strips help maintain consistent oil ducts and support spacers, while radial spacer strips help space windings; together they form a stable spacing system in the coil.
Upstream materials are mainly transformer presspaper/pressboard (transformerboard) made from high-purity cellulose and processed for electrical insulation; these paper/board materials are standardized in industry under IEC frameworks for presspaper/pressboard. Some variants are additionally compacted for dimensional stability or supplied one-side coated / uncoated depending on the insulation system design. Downstream demand is primarily from liquid-filled power transformers, distribution transformers, and traction transformers.
In 2025, global sales of Oil Duct Spacer Strips reached approximately 9,636 tons, with an average global market price of around US$ 8,126/ton. Production capacity varies significantly among manufacturers, with gross profit margins ranging from approximately 20% to 35%.
Oil duct spacer strips are critical cellulose-based spacing elements inside liquid-filled transformer windings, primarily used to form and maintain cooling ducts while providing mechanical support. Demand largely tracks transformer build and replacement cycles. As grid expansion, renewable integration, and load growth from electrification place more pressure on delivery schedules and reliability, the transformer supply chain has been under strain, which in turn elevates the importance of qualified insulation components that can be delivered consistently and on time. Even though these parts are small in cost share, their dimensional stability and oil-duct consistency can materially affect thermal performance and long-term risk, making them “small but critical” items in transformer manufacturing.
On the supply side, competition is shifting from selling base presspaper/pressboard to offering value-added, drawing-based machined parts and kits. Higher-density pre-compressed pressboard, calibrated thickness, low shrinkage, and strong oil compatibility—combined with tighter tolerances, rounded edges, controlled dryness, and clean packaging—are increasingly decisive. Qualification discipline, repeatability in machining, and global footprint for OEM support form high barriers for new entrants.
Key risks include volatility in pulp and energy inputs, capacity tightness that amplifies lead-time and inventory pressures, and selective substitution by aramid papers, composites, or alternative structural designs in certain insulation systems. Overall, the segment is positioned for steady expansion alongside ongoing grid investment and transformer renewal, with further consolidation toward suppliers that can meet stricter quality, traceability, and delivery requirements.
LP Information, Inc. (LPI) ' newest research report, the “Oil Duct Struct Industry Forecast” looks at past sales and reviews total world Oil Duct Struct sales in 2025, providing a comprehensive analysis by region and market sector of projected Oil Duct Struct sales for 2026 through 2032. With Oil Duct Struct sales broken down by region, market sector and sub-sector, this report provides a detailed analysis in US$ millions of the world Oil Duct Struct industry.
This Insight Report provides a comprehensive analysis of the global Oil Duct Struct landscape and highlights key trends related to product segmentation, company formation, revenue, and market share, latest development, and M&A activity. This report also analyzes the strategies of leading global companies with a focus on Oil Duct Struct portfolios and capabilities, market entry strategies, market positions, and geographic footprints, to better understand these firms’ unique position in an accelerating global Oil Duct Struct market.
This Insight Report evaluates the key market trends, drivers, and affecting factors shaping the global outlook for Oil Duct Struct and breaks down the forecast by Type, by Application, geography, and market size to highlight emerging pockets of opportunity. With a transparent methodology based on hundreds of bottom-up qualitative and quantitative market inputs, this study forecast offers a highly nuanced view of the current state and future trajectory in the global Oil Duct Struct.
This report presents a comprehensive overview, market shares, and growth opportunities of Oil Duct Struct market by product type, application, key manufacturers and key regions and countries.
Segmentation by Type:
Axial Strips
Radial Spacer Strips
Duct Spacing Presspaper
Segmentation by Manufacturing Route:
Milled/Machined Strips
Calibrated Strips
Compacted Presspaper
Segmentation by Profile:
Rectangular Strips
Dovetail Strips
T-strips
Segmentation by Application:
Oil-filled Transformers
Traction Transformers
Other
This report also splits the market by region:
Americas
United States
Canada
Mexico
Brazil
APAC
China
Japan
Korea
Southeast Asia
India
Australia
Europe
Germany
France
UK
Italy
Russia
Middle East & Africa
Egypt
South Africa
Israel
Turkey
GCC Countries
The below companies that are profiled have been selected based on inputs gathered from primary experts and analysing the company's coverage, product portfolio, its market penetration.
Hitachi Energy
Weidmann Electrical Technology
KREMPEL
Nantong Zhongling Electric Power Technology
Henan YAAN Electrical Insulation Plant
Shandong Jinbao Electrical
Shenyang Defeng Insulation Materials
Key Questions Addressed in this Report
What is the 10-year outlook for the global Oil Duct Struct market?
What factors are driving Oil Duct Struct market growth, globally and by region?
Which technologies are poised for the fastest growth by market and region?
How do Oil Duct Struct market opportunities vary by end market size?
How does Oil Duct Struct break out by Type, by Application?
Please note: The report will take approximately 2 business days to prepare and deliver.
Table of Contents
95 Pages
- *This is a tentative TOC and the final deliverable is subject to change.*
- 1 Scope of the Report
- 2 Executive Summary
- 3 Global by Company
- 4 World Historic Review for Oil Duct Struct by Geographic Region
- 5 Americas
- 6 APAC
- 7 Europe
- 8 Middle East & Africa
- 9 Market Drivers, Challenges and Trends
- 10 Manufacturing Cost Structure Analysis
- 11 Marketing, Distributors and Customer
- 12 World Forecast Review for Oil Duct Struct by Geographic Region
- 13 Key Players Analysis
- 14 Research Findings and Conclusion
Pricing
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