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Spacers, Standoffs & Binding Hardware › Spacers, Bushings & Distance Sleeves

Factory-Direct Excellent Flexibility Class-a Insulation Board for Transformer Insulation for Transformer Spacer for Semiconductor for Motor Winding

Updated 2026-11-04 · Markdown version

Model no. 3021

US$1.6810–99 kilograms

US$1.64100+ 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

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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

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/

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

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US$1.64 – 1.68MOQ 10 kilogramsGet a quote WA