Electrical insulation kraft paper is supplied in rolls with different thicknesses and customized widths. We can arrange slitting, sample testing, export packing, and technical confirmation based on the customer's application and production line requirements.
Chengrui Insulation is a Chinese electrical insulation kraft paper supplier supplying cable manufacturers, transformer factories, electrical equipment producers, insulation converters and industrial distributors worldwide.
Our electrical insulation kraft paper is produced from high-purity cellulose fibers and is widely used for cable insulation, conductor wrapping, transformer insulation systems and laminated electrical insulation materials.
Available in customized thicknesses, widths and roll formats, our products can be supplied according to customer drawings, technical specifications and production requirements.
HD silk-printed tempered glass for iPhone, made by kmore Optical in Dongguan, China (established 2015). Tooled 1:1 to each iPhone model, with a precision silk-printed black border around 0.6 mm that blends into the frame and keeps dust out. Light transmittance is typically above 95% and reaches 96%+ on premium models, so colour stays true with no rainbow tint. 9H high-alumina silicate glass, OCA full lamination, electroplated AF oleophobic coating and CNC chamfered edge. OEM/ODM supported custom logo, retail packaging and model-specific tooling. MOQ negotiable, small trial orders available; sampling 3-5 days, mass production 7-15 days.
The thermally upgraded insulation paper is made from 100% electric grade unbleached pulp, and upgrading is achieved by adding nitrogen to the paperpulp. We supply thermally upgraded kraft paper for transformer insulation systems that require better thermal aging performance than standard kraft paper.
TUP is mainly used for winding insulation, conductor wrapping, layer insulation, and insulation components in oil-immersed transformers. Chengrui Insulation can offer both green and natural color thermally upgraded paper.
Main Features:
â??E-Class 120�°C certified heat resistance for reliable thermal endurance
Diamond dotted paper (DDP) is an electrical insulation presspaper partially coated with heat-curable epoxy resin dots arranged in a diamond pattern. During coil drying / oven heating, the resin dots soften and cure to bond adjacent layers, helping improve winding mechanical stability in transformer manufacturing.
DDP insulation paper is commonly used as interlayer insulation between coils in oil-immersed transformers, where controlled bonding is needed without sacrificing oil impregnation and drying efficiency.
Chengrui Insulation can provide DDP insulation paper in rolls with different thicknesses, widths, and slitting options according to production requirements. Our team can help confirm roll size, resin dot pattern requirements, packing method, sample availability, and bulk order delivery schedule.
G10 and G11 epoxy fiberglass laminate sheets are high-strength electrical insulation materials made from glass fiber cloth impregnated with epoxy resin and laminated under heat and pressure. They combine excellent electrical insulation, mechanical strength, dimensional stability and moisture resistance, making them widely used in electrical equipment, transformers, motors, switchgear, fixtures and structural insulation parts.
Chengrui supplies both G10 epoxy fiberglass laminate sheet and G11 epoxy fiberglass laminate sheet and FR4 insulation sheet in different thicknesses, colors, sheet sizes and machined parts according to customer requirements. Standard sheets can be supplied directly, and custom cutting, CNC machining, drilling, milling and shape processing are available for insulation components.
G10 epoxy fiberglass laminate sheet is a rigid laminated insulation sheet made from epoxy resin and fiberglass cloth. It is one of the most commonly used epoxy glass laminate materials for electrical insulation and mechanical support.
G11 epoxy fiberglass laminate sheet is a higher-temperature epoxy fiberglass laminate. It is also made from epoxy resin and fiberglass cloth, but compared with G10, G11 is designed for better thermal performance and improved stability under elevated temperature conditions.
Type: Epoxy fiberglass laminated sheet
Thickness: 0.1mm-250mm
Standard Dimension: 1020*1220mm; 1220*2040mm; 1220*2440mm; 1020*2040mm; 1020*2040mm or customized.
Customized sizes available.
Thermal Class: G10- B Class 130â G11-F Class 155/H Class 180
Our transformer insulation pressboard support strips are manufactured using highly refined and purified insulating pressboard to ensure excellent performance in electrical applications. The material is carefully processed to achieve uniform thickness and is free from pinholes, undispersed fiber bundles, and other microscopic defects. This meticulous production process guarantees consistent quality and reliable insulation properties for your transformer applications.
The main types of Pressboard Support Strips:
R-Chamfered Support Strip / Radius Edge Support Strip
Non-Chamfered Support Strip / Square Edge Support Strip
Right-Angle Edge Support Strip
Applications and Functions of Insulation Support Strips:
â??Oil-Immersed Transformers:
Winding Fixation: Work together with upper and lower positioning rings and columnar spacers to create a robust mechanical support system, preventing winding short circuits or deformation.
Cooling Optimization: The spacing between insulation support strips directly influences oil flow. Elongated hole designs (e.g., 20-30 mm spacing, 5-8 mm diameter holes) increase the heat dissipation surface area.
Dry-Type Transformers:
Utilize high-temperature-resistant materials (e.g., Class F, 155C) to avoid softening or deformation under thermal stress.
â??Special Scenarios:
High-Humidity Environments: Employ anti-hygroscopic materials such as polyimide composites.
High-Frequency Transformers: Optimized dielectric properties help minimize partial discharge risks.
Transformer insulation pressboard is a rigid cellulose board used for barriers, spacers, cylinders and other structural insulation parts in oil-filled transformers. It offers good mechanical strength, dielectric insulation and oil compatibility.
Why Pressboard Is Used in Transformer Insulation
In transformers, insulation is not only an electrical issue. It is also a structural and mechanical issue.
That is why pressboard transformer insulation is widely used. Compared with thinner insulation papers, pressboard provides:
higher mechanical strength
better dimensional stability
stronger support for internal parts
good dielectric insulation
good performance in oil-immersed transformer systems
360 four-way privacy silk-printed tempered glass for iPhone, from kmore Optical (Dongguan, China, established 2015). A precision micro-louver structure blacks out or blurs the screen from the top, bottom, left and right, while the front view stays bright and sharp; front light transmittance is above 92%. The silk-printed black border meets the iPhone frame cleanly, with camera, earpiece and sensor cutouts positioned per model. 9H tempered glass, OCA full lamination and electroplated AF oleophobic coating. OEM/ODM: custom logo, packaging and model-specific tooling. MOQ negotiable; sampling 3-5 days, bulk 7-15 days.
R5 laminated insulation sheet is a flame-retardant epoxy fiberglass laminate used in electrical insulation and structural applications where high mechanical strength, dimensional stability and reliable heat resistance are required.
It is made from epoxy resin reinforced with woven glass fiber cloth under heat and pressure. Compared with standard glass epoxy laminates, FR5 is commonly selected for applications that require better thermal performance and flame retardancy while maintaining strong electrical and mechanical properties.
For buyers who need a rigid laminate that can handle both insulation duty and machined structural use, FR5 is a practical and widely accepted material choice.
Chengrui Insulation supplies FR5 laminated insulation sheets for electrical equipment manufacturers, transformer factories, new energy equipment producers, industrial processors and insulation parts distributors. We can supply FR5 sheets in standard panel sizes or custom-cut sizes, and we also support CNC machining, drilling, milling and part fabrication based on customer drawings.
Type: Insulation sheet
Thermal Class: F Class 155/ H Class 180
Density: 1.95 - 2.05 g/cm³
Flame Retardancy: UL94 V-0
Thickness: 0.1 ~250mm
Standard size: 1020x 1220 mm, 1220 x 2040 mm, 1220x 2440 mm, 1020 x2040 mm or customized
FR4 epoxy fiberglass insulation sheet is a high-performance rigid laminate made from woven fiberglass cloth and epoxy resin under heat and pressure. It is widely used in electrical insulation and industrial applications where both mechanical strength and electrical reliability are required.
FR4 is one of the most commonly used glass epoxy insulation materials because it offers a strong balance of electrical insulation, mechanical strength, flame resistance, dimensional stability.
FR4 is an abbreviation for "Flame Retardant 4". It is a specific level of G10 epoxy glass laminate with the addition of flame retardants such as brominated epoxy resin, achieving a stringent flame retardant standard (UL94 V-0). FR4 is designed to self-extinguish rapidly once removed from an open flame, a fundamental safety requirement for electronic products to prevent fires caused by circuit failures.
We can provide various size scarves and silk scarves, materials including silk, acrylic, polyester, wool, etc. The prices are very favorable for large quantities, and we also have our own store in Amazon.
100% pure cotton disposable face towel, ideal for beauty salons, hotels and household daily use. Soft, lintâ??free, highly waterâ??absorbent and gentle to sensitive skin.
Available in roll type and flat packed type. We support custom sizes, logo printing and privateâ??label OEM service.
Sold by export carton. Each carton contains 48 packs. Unit price per pack can be provided upon your request.
Suitable for bulk wholesale orders. Please send your inquiry with order details to get our best offer.
A4
A4 is a paper size that is used for a wide range of documents, including magazines, catalogs, letters and forms.
Dimensions
A4 measures 210- 297 millimeters or 8.27-11.69 inches. In PostScript, its dimensions are rounded off to 595 -842 points. Folded twice, an A4 sheet fits in a C6 size envelope (114 - 162 mm).
Part of the ISO 216 standard
A4 is part of a set or range of page sizes, called the ISO A or ISO 216 standard. This international standard is based on the German DIN 476 standard from 1922. A4 is actually often referred to as DIN A4. The Japanese have adopted the same range of paper sizes in their JIS P 0138-61 standard.
Designed for various applications including labeling, packaging, shipping, and retail, our self-adhesive materials offer customizable options to meet the unique requirements of our customers.
Adhesive paper are all of high quality. we have Chinese top level facilities for coating, laminated label material.
Ouradhesive papersurface material comes from APP, and theliner comes from UPM. We also have many kinds of glue, such as hotmelt,acrylic,supermarket glue,logistics glue, removable glue, etc. Suitable for different usage scenarios.
Please contact us for more options.
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