Pressboard insulation manufactured by Hitech Insulation, Chennai
49+ years in electrical insulation • Guindy, Chennai

Pressboard & Pre-Compressed Pressboard Manufacturer in Chennai

Electrical grade pressboard sheets, high-density pre-compressed pressboard, machined and moulded pressboard components and complete transformer insulation kits – made to your drawings and supplied across India and for export.

Get a Pressboard Quote+91 90032 88146

Transformer pressboard, made in Chennai since 1977

Hitech Insulation is a pressboard and electrical insulation manufacturer in Guindy, Chennai, Tamil Nadu. We supply electrical grade pressboard sheets, pre-compressed pressboard, moulded pressboard components and transformer insulation kits to power and distribution transformer manufacturers, repairers and OEMs.

Our second unit at Kundrathur, Chennai is dedicated to pressboard component manufacturing. Every part is cut, machined or moulded to the customer's drawing, inspected for dimensions, and dispatched tagged and kitted by assembly sequence – so your shop floor spends less time cutting and more time winding.

Our Pressboard Range

From full sheets to finished, kitted transformer insulation components.

Electrical Grade Pressboard Sheets – Hitech Insulation, Chennai

Electrical Grade Pressboard Sheets

Electrical grade cellulose pressboard sheets for solid insulation in oil-immersed power and distribution transformers

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Pre-Compressed Pressboard – Hitech Insulation, Chennai

Pre-Compressed Pressboard

High-density pressboard for critical transformer insulation and load-bearing applications

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Moulded Pressboard Components – Hitech Insulation, Chennai

Moulded Pressboard Components

Hot-moulded pressboard insulation components for complex transformer geometries

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Transformer Insulation Component Kits – Hitech Insulation, Chennai

Transformer Insulation Component Kits

Pre-assembled pressboard insulation kits for transformer manufacturing

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Pressboard vs Pre-Compressed Pressboard

Which grade should you specify? A quick engineering comparison.

PropertyElectrical Grade PressboardPre-Compressed Pressboard
What it isCalendered cellulose board made from high-purity, long-fibre pulpPressboard compressed under heat and pressure to a higher density
Density0.9 – 1.2 g/cm³1.3 – 1.4 g/cm³
ThicknessThinner sheets – easy to bend, wrap and form3 mm – 75 mm sheets and blocks
ShrinkageLowVery low – holds winding height under clamping
Typical partsBarriers, cylinders, wraps, strips, radial spacersSupport blocks, clamping & pressure rings, thick spacers, lead supports
Best forDistribution transformers and general solid insulationPower transformers and load-bearing, short-circuit-stressed zones

Values are typical. Exact grade, density and test data are confirmed with each quotation.

Machined pressboard transformer insulation components – spacers, strips and rings

Pressboard Components We Manufacture

  • Radial spacers and duct spacers
  • Axial strips / sticks and dovetail strips
  • Winding cylinders and barrier wraps
  • End rings, clamping rings and pressure rings
  • Support blocks and yoke insulation
  • Angle rings, caps, snouts and lead exits (moulded)
  • Lead supports, cleats and bushing insulation
  • Complete transformer insulation kits to drawing

Pressboard Supply Across India & Overseas

Chennai & Tamil Nadu

Same-city supply from our Guindy and Kundrathur units to transformer makers and repairers across Chennai, Coimbatore, Hosur, Madurai, Trichy and the rest of Tamil Nadu.

South & North India

Regular dispatch to Karnataka, Andhra Pradesh, Telangana and Kerala, and to Maharashtra, Gujarat, Delhi NCR, Uttar Pradesh, Haryana, Punjab, Rajasthan, Madhya Pradesh and West Bengal.

Export Orders

Export-packed pressboard sheets and finished components for transformer manufacturers and repair shops overseas. Share your drawings and destination port for a quotation.

How to Order Pressboard from Hitech

Step 1

Send your requirement

Drawing, BOM or sheet size, thickness, grade and quantity – by email, phone or the quote form.

Step 2

Engineering review & quote

Our team checks the material and machining needed and sends pricing and lead time within 24 hours.

Step 3

Manufacture & inspection

Cutting, machining or moulding in Chennai, followed by dimensional inspection of every batch.

Step 4

Kitted dispatch

Parts tagged and grouped by transformer and assembly sequence, packed for safe transit across India or for export.

Pressboard FAQs

What is pressboard in a transformer?
Pressboard (transformer board) is a dense cellulose board that forms the solid insulation in oil-immersed transformers. After it is dried and impregnated with transformer oil it gives high dielectric strength, and it is used for barriers, cylinders, spacers, strips, rings and support blocks.
What is pre-compressed pressboard and when should I use it?
Pre-compressed pressboard is pressboard that has been compressed to a higher density (about 1.3–1.4 g/cm³). It shrinks less and carries more mechanical load, so it is used for thick spacers, support blocks and clamping rings that must hold winding height and resist short-circuit forces – especially in power transformers.
Who manufactures pressboard components in Chennai?
Hitech Insulation, Industrial Estate, Guindy, Chennai has been in electrical insulation since 1977. Our Kundrathur unit is dedicated to pressboard component manufacturing – spacers, strips, rings, blocks, moulded parts and complete transformer insulation kits made to drawing.
Do you supply pressboard to North India?
Yes. We dispatch pressboard sheets and finished components to transformer manufacturers in Maharashtra, Gujarat, Delhi NCR, Uttar Pradesh, Haryana, Punjab, Rajasthan, Madhya Pradesh, West Bengal and other states, as well as across South India.
Can Hitech Insulation export pressboard?
Yes, we accept export orders for pressboard sheets, pre-compressed pressboard and machined or moulded components. Send drawings, quantities and the destination port and we will quote with export packing.
What is the price of pressboard / pre-compressed pressboard?
Pressboard is usually priced per kilogram and depends on grade, density, thickness, quantity and any machining. Send your sheet size or drawing and quantity and we will send a firm price within 24 hours.
Can you machine pressboard to my drawing?
Yes. We cut, punch, CNC machine, drill, bond and mould pressboard to customer drawings, and can supply individual parts or complete kits tagged by assembly sequence.
What information do you need for a pressboard quote?
Grade (standard or pre-compressed), thickness, sheet size or drawing, quantity, delivery location and required date. For kits, share the transformer rating and the insulation drawing or BOM.

Need pressboard or pressboard components?

Send your drawing, thickness and quantity. Our Chennai team replies within 24 hours.

Request a QuoteEnquire on WhatsAppsrk@hitechinsulation.in