Experienced Manufacturer Since 1990

It’s not easy to introduce all aspects of insulation sheets. So we prepare a lot of information here for you to delve into, including types of sheets, general applications, your purchase order process, how we support you, service & advantage, duration estimation, FAQs, and so on. All will guide you to purchase insulation sheets from China.

How To Choose Electrical Insulating Sheets

It is quite essential to know the insulation properties of the materials, including dielectric strength, compressive strength, tensile strength, pressure resistance, impact resistance, corrosion resistance, cryogenic resistance, and flame resistance. The below information will help you to choose sheet materials according to your application requirement. You can download the related datasheet here for your reference.

Application scope of phenolic paper sheet

This product is a laminated paperboard made of insulating impregnated paper impregnated with phenolic resin by drying and hot pressing. It has good mechanical and electrical properties under normal conditions, and is suitable for insulation structural parts in motor and electrical equipment with high mechanical performance requirements. It can also be used in transformer oil and hot stamping processing.


The surface shall be flat and smooth, without bubbles, impurities and other obvious defects, slight scratches are allowed, the edge shall be cut neatly, and the end face shall be free of delamination and cracks.

GENERAL Applications 【Industries We Serve】

Transformers & Reactors

Transformers and reactors both need that insulating materials are flame retardant, heat resistance, weather resistance, high insulation performance, and mechanical strength.

Circuit Breakers

In the molded case circuit breakers, contacts, arc interrupters, release, and operating mechanisms are all installed in a plastic shell through modularization. GPO3 sheet is commonly used as the arc suppression sheet in circuit breakers for protecting.

Rail Transit

In rail transit, there are many modules like motor, traction motor, or interior decoration that will use GPO3, FR4/FR5. It requests the safety performance flame retardant V0 grade, temperature resistance Class F or above, also a certain mechanical strength.

Wind Power Generation

Wind power generation is an important power generation item in new energy. When the fan blades are rotated by the wind, the motor will be driven to generate electricity. FR4 or FR5 materials are mostly used in wind energy motors. It requires temperature resistance above class F and flame retardant V0 level.

Solar Industry

The photovoltaic system is composed of photovoltaic modules, bus boxes, inverter cabinets, distribution cabinets, transformers, and power grids. The insulation requirements are similar to transformer and power grid transmission and distribution. GPO3, FR4, etc. are used insulation sheet materials for supporting, load-bearing, and isolation in inverter cabinets, distribution cabinets, bus cabinets, and switch cabinets.

Industrial Equipment

It has different requirements for insulation materials in the field of industrial equipment. It requires high mechanical performance, environmental protection, easy installation, sealing, etc. in the application of machinery manufacturing equipment, mechatronics equipment, medical equipment, household appliances, central air-conditioning compressors, and other industrial equipment.

Process From Purchase Order To Finished Products

Bulk Production

We have 2 factories and 5 production lines in China mainland and can produce different material types of insulation materials. Production capacity will meet the needs of different customers. If your demand is huge, we can start up 5 production lines to ensure the delivery time.

Custom Cutting

We have extensive experience cutting electrical components from a variety of electrical insulating materials, including epoxy glass, G10/FR4, phenolic, GPO-3, bakelite. Every electrical cutting insulator will meet custom specifications and international standards.

CNC Machining

We have everything you need to get custom machining parts. Our CNC machine shop that’s extensively equipped to produce the components economically regardless of order quantity. All you have to do is give us your requirements and parts’ drawings. Custom CNC machining service to make the part for you.

Packing & Shipping

In order to ensure that the goods are not easily damaged in transit, we use plywood boxes as outer packing. At the same time, our insulation material will be wrapped with a layer of PP film to ensure that all of the goods will not be affected by moisture. We use wooden cases or pallets with IPPC marks, which fully meet the import requirements.

A Brief Self-Nomination, Why Choose Us

XXX was found in 1990 in China and committed to producing electrical insulation materials. We are very strict in producing our products, going through several processes from the transportation of raw materials to processing the finished products. We want to ensure that every insulation material you receive is of high performance and quality.
Youda will also perform custom fabrication and secondary machining to better qualify these products to your specific needs. View more!

Dedicated Warehouse & Machining Workshop

The Process Flow & Duration Estimation

Please note that the final cost depends on the customized service you require, the specifications of the raw materials used, the relevant national laws, and the distance of transportation. Take the example of booking a tall container of products:

STEP1: Requirements Communication 1-3 Days

The first step is that we can talk about the thickness, customized size, temperature resistance grade, quantity, and all of your requirements. If you need machining parts, you can provide the drawings, tolerance range, and raw materials requirements to us. Then our engineers will check and reply to your every question so that you can understand clearly about our production planning.

STEP2: Sampling 1-3 Days

For purchasing insulation sheet materials, we will provide 1-2 pieces samples in A4 size for your testing. If you request machining parts, we will process samples according to the confirmed design drawing. Due to the processing difficulty, the time will be different. In general, a4 size sheet samples can be done within 1 day. And machining parts will be within 3 days. Then we will send them to you.

STEP3: Contract & Payment 1 Day

Once the details of the proforma invoice are confirmed by both of us, you can arrange the deposit for us according to the invoice. Meanwhile, we can also provide a Confidentiality Agreement, Quality Assurance Agreement, and International Trade Contract to you. Anyway, you will be safe in doing business with us.

STEP4: Manufacturing & Testing 15-20 Days

The bulk manufacture will be started according to the confirmed sample. We should prepare related raw materials and finish your order. After the end of production, our special testing department will test this batch of products and issue a quality certificate. Ensure that the quality of each product is up to standard before it leaves the factory. All will be finished in about 15-20 days.

STEP5: Shipping 10-15 Days

We will book the shipping space in advance while packing your order goods. The goods will be sent to the nearest seaport as soon as they are packed well. We know that due to the epidemic, booking shipping space is more difficult than before, and many cargo ships can not reach Chinese ports on time. Now what we do is to try our best to deliver the goods to the port on time, for saving your time.

The FAQs Throughout The Trading Process

XXX has been producing electrical insulation materials for 30 years and has encountered all kinds of problems. Here are the most important concerns of our customers before closing the deal.

Looks to be exactly what I was expecting to receive. The external look – absolute 5 stars! Special thanks for the separate protection foil for each sheet – it really made a great job protecting the gloss finish during the transportation – no scratches on the sheets at all. The mechanical properties still need to be checked, but I’m absolutely confident it should be perfect. Also need to highlight suppliers highest communication skills and great support while solving transportation questions. Thanks.