ABOUT US
Why Chengrui
Learn more about Chengrui and provide you with better service.
Electrical insulation materials for motor & transformers
Since 2010, Chengrui has been dedicated to supplying electrical insulation materials for the global transformer and motor industries.
From insulation paper and insulation film to laminated sheets and customized insulation components, we provide practical insulation solutions that help manufacturers improve product reliability and simplify purchasing.
With years of export experience and a strong manufacturing network, Chengrui supports customers in more than 50 countries in Southeast Asia, South Asia, the Middle East, South America with stable quality, flexible production and efficient delivery.
Our mission is simple: to make sourcing electrical insulation materials easier, more reliable and more cost-effective for customers worldwide.
2010
Founded in
3000+
Sqm Factory
30+
Business Partners
10+
Compliance Documents
ELECTRICAL INSULATION MATERIALS
Product Categories
Browse our core insulation material categories for motors, dry-type transformers, and oil-immersed transformers.
Diamond Dotted Paper (DDP)
Chengrui Insulation Material supply diamond dotted paper for transformer manufacturers, with common ...
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Thermally Upgraded Diamond Dotted Paper (TU DDP)
Thermally Upgraded Diamond Dotted Paper is a 120°C thermal class insulation material for oil-immerse...
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Electrical Insulation Kraft Cable Paper |Custom DPC Paper
Electrical insulation kraft cable paper supplier supplying transformer manufacturers and insulation ...
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Electrical Insulation Pressboard For Transformer
Transformer pressboard for pressboard transformer insulation and transformer insulation pressboard a...
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FR4 Epoxy Fiberglass Laminated Sheet
FR4 epoxy fiberglass insulation sheet for electrical insulation and industrial machining. Flame-reta...
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G10 G11 Epoxy Laminated Insulation Sheet
Compare G10 and G11 epoxy fiberglass laminate sheets for electrical insulation, structural support a...
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3021 Phenolic Paper Laminated Sheet
3021 phenolic paper laminated sheet is an electrical insulation board made from paper impregnated wi...
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6051 Insulation Polyimide Film
6051 polyimide film or polyimide film sheet is one of the electrical insulation film. It is synthesi...
Learn MoreFIND THE RIGHT SOLUTION FOR YOUR EQUIPMENT
Shop by Application
Explore insulation materials by your specific application. Chengrui provides proven materials for motors, dry-type transformers, and oil-immersed transformers, backed by deep industry experience.
WE UNDERSTAND YOUR CONCERNS
Common Challenges in Insulation Material Sourcing
We understand your concerns and provide reliable solutions.
don't fully match
affect your production
between batches
for material selection
are hard to source
and compliance documents
QUALITY ASSURED
Certifications
Quality is built into every step of our process. Chengrui supports customers with documented quality control and key certifications, including ISO 9001, SGS, TDS, and RoHS & REACH compliance.
ISO 9001
Quality Management System
SGS
Independent Product Testing
TDS
Technical Data Sheets
RoHS & REACH
Environmental Compliance
MANUFACTURER INDUSTRY NEWS
Blog & Case Studies
Let you know about our latest technological product information
Transformer Pressboard RFQ: What to Include
Prepare a transformer pressboard RFQ with the right grade, thickness, drawing re...
GPO-3 Sheet for Electrical Insulation | Applications and Selection Guide
GPO-3 sheet, also known as GPO3 insulation sheet or UPGM-203, is used for switch...
Diamond Dotted Paper: 8 Checks Before Ordering
Buying diamond dotted paper for transformers? Check thickness, resin coating, cu...
Nomex Paper Complete Guide for Beginners
Nomex paper is a high-performance aramid insulation material used in motors, tra...
Transformer Market Analysis: Growing Demand for Electrical Insulation Materials
Transformer demand is growing with grid upgrades, renewable energy, data centers...
FAQ
Frequently Asked Questions
Answers to common questions from motor and transformer manufacturers sourcing electrical insulation materials.
01
Are you a manufacturer or a trading company?
Chengrui combines our own manufacturing capabilities with a qualified partner production network. This allows us to supply a wide range of electrical insulation materials while maintaining specification control, quality inspection and technical support.
02
How do you ensure consistent quality from batch to batch?
We implement strict quality control procedures at every stage, including raw material inspection, in-process testing, and final batch verification to ensure consistent performance.
03
Can you provide samples for testing and supplier qualification?
Yes, we can provide samples for your testing and qualification processes. Please contact our team to discuss your specific sample requirements.
04
What technical documents can you provide?
We provide comprehensive technical documents including TDS (Technical Data Sheets), RoHS & REACH compliance reports, and ISO 9001 certification details.
05
What are your MOQ, lead time and shipping options?
MOQ, lead time, and shipping options vary depending on the specific material and order quantity. Please reach out to our sales team for a customized quotation.
Still have questions?
Our team is ready to support you with professional advice.
GET A QUOTE
Request a Quick Quote
Tell us what material you need and our team will review your requirement.
Quick Response
Within 24 hours
Technical Support
From selection to application
Customized Solutions
Sizes, processing, packaging
Global Shipping
By sea, air or express
