EI Laminations | Toroidal Cores | Silicon Steel Laminations

About Jirui Electrical

Jirui Electrical Appliance Co., Ltd., located in Yuyao City, Zhejiang Province, China, was founded in 2001 as a production-oriented enterprise specializing in manufacturing and processing international and various non-standard series of EI, UI, and TL silicon steel sheets, as well as toroidal iron cores.

With over 20 years of professional experience, we deliver high-strength, durable laminations that resist deformation and ensure long service life. Our team of engineers, inspectors, and technical staff ensures every product meets the highest standards.

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20+

Years of Industry Experience

Our Products

Precision-engineered laminations and cores for a wide range of electrical applications. Custom designs available upon request.

EI Core Lamination

Standard and custom EI laminations made from high-grade silicon steel for single-phase transformers and power supplies.

• High magnetic permeability
• Low core loss
• Available in multiple sizes

UI Core Lamination

Robust UI laminations ideal for industrial control transformers and heavy-duty applications.

• High saturation flux density
• Excellent thermal stability
• Customizable stack heights

EI Three-Phase Lamination

Designed for three-phase transformers with balanced magnetic circuits and minimal losses.

• Optimized for 3-phase systems
• Low no-load loss
• High efficiency

TL Core Lamination

Specialized laminations for high-frequency applications and compact transformer designs.

• Thin gauge steel
• Reduced eddy current loss
• Precision stamped

Oriented Silicon Steel Toroidal Core

High-efficiency toroidal cores made from grain-oriented silicon steel for premium transformers.

• Ultra-low core loss
• Uniform magnetic properties
• Ideal for audio and medical equipment

Non-Oriented Silicon Steel Toroidal Core

Cost-effective toroidal cores with excellent performance across multiple directions.

• Isotropic magnetic properties
• Suitable for variable loads
• High durability

Custom Laminations

Custom EI & UI Laminations

We design and manufacture non-standard laminations based on your exact specifications.

• Prototype to mass production
• Fast turnaround
• Engineering support

Transformer Cores

Complete Transformer Cores

Fully assembled and tested cores ready for winding and integration.

• Pre-gapped options
• Insulated layers
• Quality certified

Product Applications

Our laminations and cores are trusted in critical electrical systems worldwide.

Single-Phase Transformers

Used in power supplies, lighting, and household electronics.

Toroidal Transformers

Compact, efficient designs for audio, medical, and industrial use.

Power Transformers

High-capacity transformers for energy distribution and industrial power.

Control Transformers

Reliable performance in automation, machinery, and control panels.

Support & FAQ

What materials do you use?

We use high-quality oriented and non-oriented silicon steel, ensuring low core loss and high magnetic permeability.

Can you produce custom laminations?

Yes, our technical team can design and manufacture custom EI, UI, TL, and toroidal cores based on your drawings or specifications.

What is your production capacity?

We produce over 10,000 tons of silicon steel laminations and 2,000 tons of toroidal iron cores annually.

Do you offer samples?

Yes, we provide samples for evaluation. Contact us to request a sample of your desired product.

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