Laminated Densified Wood Composites

InsuLam® Densified Wood Laminates for Electrical Insulation and Structural Strength

InsuLam® laminated densified woods combine high mechanical strength and excellent electrical properties within a single engineered material system. For over seven decades, CK Composites has supplied the structural insulation components used throughout critical electrical infrastructure, transportation, and defense systems.

Engineered to match application physics

Proven in harsh transportation environments

Built to specs for reliable fit and performance

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Tough. Stable. Moisture-Resistant.

Grain‑Aligned Laminated Densified Wood for Maximized Flexural Strength

InsuLam® is produced from European beech veneers impregnated with electrical-grade phenolic resin and densified under several thousand tons of pressure. InsuLam® is ideal for applications when structural loads and electrical insulation requirements must be satisfied simultaneously.

With various grain orientations available, tangential orientation is especially well-suited for transformer pressure rings. InsuLam® aligns wood fibers tangentially with the direction of stress in the finished component, maximizing usable flexural strength where it matters most. The result is a resin-composite material that combines the mechanical toughness of wood with the stability and moisture resistance of a thermoset resin system.

Key Performance

Tunable density in P60 and P72 configurations. Consistent mechanical and electrical properties across temperature extremes. Moisture and termite resistant. Machinable to exact specifications.

North American Manufacturer

CK Composites is the only manufacturer in North America capable of producing densified laminate components through a fully integrated process, from veneer preparation through finished machining, within a single facility.

Laminated Densified Wood Components

InsuLam® components are specified wherever high compressive loads, dimensional stability, and electrical insulation must coexist in a long-lifecycle application.

Flexible Performance

Insulator Systems That Carry Both Structural Load and Voltage

InsuLam® is frequently selected when structural loads and electrical insulation requirements must be satisfied simultaneously. Its unique combination of strength, toughness, dimensional stability, and dielectric performance makes it well suited for large transformer assemblies, rail systems, and other demanding applications.

Primary high‑voltage insulation with mechanical support and load transfer

Creepage, clearance, and field‑grading / stress control with moisture and contamination barrier

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Strength

Performance

For Next‑generation Insulation Systems

Two Specific Grades:
Insulam LH™ and Insulam EH™

Insulam EH™ Fully Impregnated Laminated Densified Wood
Insulam EH™ is a fully impregnated densified wood product that offers high mechanical strength, high dielectric strength and dimensional stability.  The product is easily machined and widely used in Electric Power equipment and cryogenic applications.

Insulam LH™ Non Impregnated Laminated Densified Wood (IEC 61061)
Insulam LH™ is non-impregnated product which is manufactured to comply with DIN 7707 and IEC 61061. This grade is used primarily by OEMs in oil- insulated power transformers as pressure rings and for blocking/supports. Pressure Rings are manufactured in 2 densities LH77P72(IEC TYPE T4R), and LH77P60(IEC type T2R).

Integrated densified wood manufacturing

Process Capabilities & Quality Discipline

Production Scale & Flexibility

InsuLam® supports a wide range of component sizes and configurations, from precision-machined fasteners and blocking to large transformer pressure rings and railcar shoe beams. Flexible manufacturing capabilities support both custom applications and long-term OEM production programs.

Repeatability & Control

Controlled, consistent, and carefully managed manufacturing processes help deliver consistent mechanical properties, dimensional accuracy, and electrical performance across production runs.

Testing & Traceability

Electrical, mechanical, dimensional, and environmental verification supports customer qualification requirements and long-term production confidence. Material and production traceability are maintained throughout the manufacturing process.

U.S.‑based Manufacturing & Supply Chain

Unlike manufacturers that import pressed laminate materials and perform only final machining, CK Composites controls the complete manufacturing process—from veneer preparation and resin treatment through lamination, densification, and finished machining.

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Representative Applications

Laminated densified wood applications across power, transportation, LNG cryogenic storage, and other high‑load, high‑voltage industrial systems.

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Power Transformers

Top and bottom pressure rings for dry-type and liquid-filled transformers — critical for maintaining coil position during short-circuit events. InsuLam®’s tangential grain orientation delivers higher flexural strength than cross-laminated materials, enabling thinner rings, smaller core windows, less oil, and reduced losses.
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Transit & Rail

InsuLam® shoe beams meet the demanding environmental and performance requirements of transit authorities across the United States — proven under moisture, load, and temperature extremes with resistance to moisture intrusion and termite damage.
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Cryogenic Applications

Structural support components for cryogenic environments where dimensional stability, low moisture absorption, and consistent mechanical properties at extreme low temperatures are required.
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Defense Systems

Structural laminated wood components for defense platforms where domestic origin, long service life, and consistent mechanical performance under harsh conditions are non-negotiable.
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High-Voltage Electrical Infrastructure

Insulation blocks and structural members for substation and distribution equipment operating in high-voltage environments.
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Industrial & Custom Structural Applications

Custom-engineered laminated wood components for industrial platforms requiring high compressive strength, moisture resistance, and electrical isolation in demanding service environments.
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Custom Laminated Densified Wood Components

Design & Engineering Support

Successful structural insulation components are developed at the intersection of material science, manufacturing expertise, and application knowledge. CK Composites’ engineering team works closely with OEMs to optimize material selection, veneer orientation, geometry, manufacturability, and long-term performance for demanding electrical and structural applications.

Whether supporting next-generation transformer designs, replacement components, or custom structural assemblies, CK Composites helps customers translate application requirements into manufacturable, reliable solutions.

Looking for a disciplined U.S. manufacturing partner?

Let’s engineer laminated densified wood components around your structural and insulation requirements.

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