--- title: "Factory-Direct Excellent Flexibility Class-a Insulation Board for Transformer Insulation for Transformer Spacer for Semiconductor for Motor Winding" description: "Factory-Direct Excellent Flexibility Class-a Insulation Board for Transformer Insulation… — Spacers, Bushings & Distance Sleeves." url: https://engineeringhardware.com/product/factory-direct-excellent-flexibility-class-a-insulation-board-for-transformer/ source: Engineering Hardware & Fasteners --- # Factory-Direct Excellent Flexibility Class-a Insulation Board for Transformer Insulation for Transformer Spacer for Semiconductor for Motor Winding [![Factory-Direct Excellent Flexibility Class-a Insulation Board for Transformer Insulation for Transformer Spacer for Semiconductor for Motor Winding](https://img.engineeringhardware.com/Factory-Direct-Excellent-Flexibility-Class-a-Insulation-Board-for-Transformer-Insulation-for-Transformer-Spacer-for-Semiconductor-for-Motor-Winding.webp)](https://img.engineeringhardware.com/Factory-Direct-Excellent-Flexibility-Class-a-Insulation-Board-for-Transformer-Insulation-for-Transformer-Spacer-for-Semiconductor-for-Motor-Winding.webp) - Standard & made-to-drawing parts - Checked before shipping - Air, sea & express delivery [Spacers, Standoffs & Binding Hardware › Spacers, Bushings & Distance Sleeves](https://engineeringhardware.com/fastener-products/spacers-standoffs-binding-hardware/spacers-bushings-distance-sleeves/) Updated 2026-11-04 · [Markdown version](https://engineeringhardware.com/product/factory-direct-excellent-flexibility-class-a-insulation-board-for-transformer.md) Model no. **3021** | **US$1.68**10–99 kilograms | **US$1.64**100+ kilograms | | --- | --- | MOQ 10 kilograms · Final price confirmed in your quote - **Color:** Brownish Yellow - **Material:** 100% Unbleached Sulfate Softwood Pulp - **Enforce Standards:** GB/T 19264.3-2013 Equivalent IEC 60641-3-1 - **Interlayer Bonding Strength:** ≥12n/30 mm - **Package Size:** 200.00cm * 100.00cm * 32.00cm Get a quote [WhatsApp](https://wa.me/8615999653684?text=Hi%20Engineering%20Hardware%20%26amp%3B%20Fasteners%2C%20I%20would%20like%20a%20quote%20for%3A%20Factory-Direct%20Excellent%20Flexibility%20Class-a%20Insulation%20Board%20for%20Transformer%20Insulation%20for%20Transformer%20Spacer%20for%20Semiconductor%20for%20Motor%20Winding%20%E2%80%94%20https%3A%2F%2Fengineeringhardware.com%2Fproduct%2Ffactory-direct-excellent-flexibility-class-a-insulation-board-for-transformer%2F) Specifications are as listed for this product. Engineering Hardware & Fasteners confirms ratings, mating parts, compatibility, packing and lead time with you before you order. ## Specifications | Customization | Available | | --- | --- | | Application | Electrical Power System, Industrial Equipment | | Color | Brownish Yellow | | Model NO. | 3021 | | Material | 100% Unbleached Sulfate Softwood Pulp | | Maximum Voltage | Air Insulation Strength ≥12kv/mm | | Thermal Rating | A 105 | | Thickness | 0.20-4.0 mm | | Enforce Standards | GB/T 19264.3-2013 Equivalent IEC 60641-3-1 | | Product Name | Electrical Insulation Pressboard | | Oil Absorption Rate | ≥9-13% | | Ash Content | ≤0.7% | | Moisture Content | ≤8.0% | | Density | 1.00-1.20 G/Cm³ | | Interlayer Bonding Strength | ≥12n/30 mm | | Compressibility | 45-50% | | Transport Package | Cartons and Wooden Pallets | | Specification | Length: 2000mm, Width: 1000mm | | Origin | Xuchang, Henan, China | | HS Code | 48239090 | | Production Capacity | 500000 Kg Per Month | | Package Size | 200.00cm * 100.00cm * 32.00cm | | Package Gross Weight | 500.000kg | | Lead Time | 3 days (1 - 50 kg) To be negotiated ( > 50 kg) | | Category | [Spacers, Bushings & Distance Sleeves](https://engineeringhardware.com/fastener-products/spacers-standoffs-binding-hardware/spacers-bushings-distance-sleeves/) | ## Technical parameters | Product Information Sheet | | | | --- | --- | --- | | Item | Organization | Indicators | | Thickness | mm | 0.20 - 4.0 | | Apparent density | g/cm³ | 1.00 - 1.20 | | Delivery moisture | % | ≤8.0 | | Ash content | % | ≤0.7 | | Water extract pH | - | 6.0 - 9.0 | | Electrical conductivity of water extract | mS/m | ≤5 - 8(The greater the thickness, the higher the limit.) | | Absorbency | % | ≥9 - 13 | | Heat shrinkage rate (120℃) | % | MD Vertical≤0.8;TD Horizontal≤1.2 | | Product Performance Table | | | | --- | --- | --- | | Item | Organization | Indicators | | Electrical strength in the air | kV/mm | ≥12 | | Electrical strength in oil (insulating oil at 90℃) | kV/mm | ≤1.6 mm:≥401.6—3.0 mm:≥35 >3.0 mm:≥30 | | Volume resistivity (at room temperature) | Ω·cm | ≥1×10^14 | | Relative dielectric constant εr (oil-immersed) | — | 3.5 — 4.2 | | Dielectric loss factor tanδ (in oil at 90℃) | — | ≤0.008 | | Tensile strength MD ( longitudinal ) | MPa | ≥90 — 105 | | Tensile strength TD (transverse ) | MPa | ≥70 — 85 | | Tensile elongation MD ( longitudinal ) | % | ≥3.0 | | Tensile elongation TD (transverse ) | % | ≥4.0 | | Interlayer bonding strength | N/30 mm | ≥12 | | Compressibility | % | 45 — 5 | ## Description Factory-Direct Excellent Flexibility Class-a Insulation Board for Transformer Insulation for Transformer Spacer for Semiconductor for Motor Winding is part of our spacers, bushings & distance sleeves range (Spacers, Standoffs & Binding Hardware). ### Key details - **Material:** 100% Unbleached Sulfate Softwood Pulp - **Application:** Electrical Power System, Industrial Equipment - **Color:** Brownish Yellow - **Maximum Voltage:** Air Insulation Strength ≥12kv/mm - **Thermal Rating:** A 105 - **Thickness:** 0.20-4.0 mm - **Enforce Standards:** GB/T 19264.3-2013 Equivalent IEC 60641-3-1 - **Product Name:** Electrical Insulation Pressboard Available configurations include color, material, enforce standards, interlayer bonding strength and package size. Custom sizes, threads, materials, grades, platings and packaging can be quoted on request. ### Ordering through Engineering Hardware & Fasteners Minimum order is 10 kilograms at US$1.64 – 1.68 per kilogram. Send one inquiry with the part number, quantity and destination, and Engineering Hardware & Fasteners confirms size, thread, material, grade, finish, price, lead time and shipping, checks the goods before dispatch and ships them to you. ## Frequently asked questions ### What is the minimum order quantity (MOQ) for Factory-Direct Excellent Flexibility Class-a Insulation Board for Transformer Insulation for Transformer Spacer for Semiconductor for Motor Winding? The listed minimum order is 10 kilograms, at US$1.64 – 1.68 per kilogram. Smaller trial quantities or samples can be requested in your inquiry; Engineering Hardware & Fasteners confirms what is possible for your size. ### How does the price change with quantity? Volume pricing: US$1.68 for 10–99 kilograms; US$1.64 for 100+ kilograms. Final prices depend on size, material, finish and packing and are confirmed in your quote. ### What are the main specifications of Factory-Direct Excellent Flexibility Class-a Insulation Board for Transformer Insulation for Transformer Spacer for Semiconductor for Motor Winding? Material: 100% Unbleached Sulfate Softwood Pulp; Application: Electrical Power System, Industrial Equipment; Color: Brownish Yellow; Maximum Voltage: Air Insulation Strength ≥12kv/mm; Thermal Rating: A 105; Thickness: 0.20-4.0 mm. The full specification table and any technical parameter tables are listed on this page. ### Can this product be customized (OEM)? Listed configurations include color, material, enforce standards, interlayer bonding strength and package size. Size, thread, length, material and grade, surface finish, head marking, packaging and labels can be quoted to your specification or drawing. ### What is the lead time and how is it shipped? Lead time depends on quantity and customization and is confirmed in your quote. Engineering Hardware & Fasteners checks the goods before dispatch and ships by express, air or sea; mixed orders can be consolidated in one shipment. ### Which other spacers, bushings & distance sleeves are available? The Spacers, Bushings & Distance Sleeves category lists 2,111 products in different sizes, materials and finishes: [https://engineeringhardware.com/fastener-products/spacers-standoffs-binding-hardware/spacers-bushings-distance-sleeves/](https://engineeringhardware.com/fastener-products/spacers-standoffs-binding-hardware/spacers-bushings-distance-sleeves/) How we work ## Specified, checked and shipped by Engineering Hardware & Fasteners Engineering Hardware & Fasteners supplies bolts, screws, nuts, washers, anchors, rivets and fastening hardware to equipment makers, contractors, distributors and maintenance teams. Orders go through one controlled process: size, thread, material, grade and finish confirmed, samples approved, dimensions, thread fit and plating checked before packing, then packed for export — standard or made to drawing. - DIN, ISO, ASTM, ANSI, JIS and GB standard parts - Non-standard parts made to your drawing - Dimensions, thread gauges and plating checked before packing - Export cartons and pallets, consolidated mixed orders - Samples available for approval before mass production [![Production floor](https://engineeringhardware.com/wp-content/uploads/2026/11/factory-01-production-floor-1024x683.webp)](https://engineeringhardware.com/wp-content/uploads/2026/11/factory-01-production-floor.webp) Production floor [![Inspection bench](https://engineeringhardware.com/wp-content/uploads/2026/11/factory-02-inspection-bench-768x512.webp)](https://engineeringhardware.com/wp-content/uploads/2026/11/factory-02-inspection-bench.webp) Inspection bench [![Sorting & 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custom quote →](https://engineeringhardware.com/contact/) ## Request a quote for this product ## Related products [All Spacers, Bushings & Distance Sleeves →](https://engineeringhardware.com/fastener-products/spacers-standoffs-binding-hardware/spacers-bushings-distance-sleeves/) [![High-Performance Warm Edge Spacer Bar with Steel Coating](https://img.engineeringhardware.com/High-Performance-Warm-Edge-Spacer-Bar-with-Steel-Coating.webp)](https://engineeringhardware.com/product/high-performance-warm-edge-spacer-bar-with-steel-coating/) Spacers, Bushings & Distance Sleeves ### [High-Performance Warm Edge Spacer Bar with Steel Coating](https://engineeringhardware.com/product/high-performance-warm-edge-spacer-bar-with-steel-coating/) 3000 Series · Stainless Steel **US$0.49 – 0.50**MOQ 700 meters [![CNC Machined Colored Anodized Polishing Aluminum Racing Car Front Rear Rim Wheel 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