[ Products · Pressboard ]
Transformer Insulation Pressboard
Plain and precompressed board for oil-immersed transformer structural insulation.
Pressboard is the structural insulation of an oil-immersed transformer. It carries mechanical load, defines clearances between windings and core, and must stay dimensionally stable through decades of thermal cycling in oil.
The main division is between plain (calendered) board and precompressed board. Precompressed board is dried and pressed under heat, which reduces shrinkage in service — this matters wherever clamping pressure must be maintained over the transformer life, such as end blocks and winding support.
Most orders in this category are cut parts rather than plain sheet: barriers, angle rings, spacers, washers and strips cut to a drawing. Sending the drawing with your enquiry is usually faster than describing the sizes.
[ Selection ]
How to choose within this category
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Plain or precompressed
Precompressed board holds clamping pressure and resists shrinkage; plain board is the lower-cost choice where dimensional stability under sustained load is not the governing requirement.
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Thickness and lay-up
Thicker barriers are often built up from laminated thinner sheets rather than a single thick board. Which route is right depends on your forming and bending requirement.
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Cut parts vs sheet
If you are cutting in-house, sheet is fine. If not, send a drawing — cut-to-size is generally more economical than paying to ship offcuts.
Typical applications
[ Buying questions ]
Ordering pressboard from China
Are you a manufacturer or a trading company for pressboard?
Both. Material comes from our production partners in Xuchang and Jiaozuo, which gives factory-level pricing and the ability to verify what you are buying. Because we are not tied to one line, we can also tell you when something is better made elsewhere instead of selling you what we happen to run.
What is the minimum order quantity?
It depends on the item and whether it is a stock grade or made to your width. Small quantities across several materials usually consolidate into a workable shipment even where no single line would clear a factory minimum. Send your list and we will tell you what is workable.
Can we get samples before ordering?
Yes, and for a first order we would encourage it. Sample material is generally free; freight arrangement varies by destination and we will confirm which applies when you enquire.
Can you supply cut or slit to our dimensions?
Yes. Slitting rolls to working width and cutting sheet to drawing are both standard. Tell us the dimensions and, for rolls, your preferred core and roll diameter so the material fits your equipment.
What are the payment terms and lead time?
For a first order, terms are usually a deposit with the balance against shipping documents. Lead time depends on whether items are stock grades or made to your specification — we will give a date against your actual list rather than a general figure.
Which ports do you ship from, and can you quote DDP?
Most shipments go through Qingdao or Shanghai. We can quote FOB, CIF or DDP depending on how much of the import side you want to handle. Tell us your destination port and we will confirm routing and a realistic door-to-door time.
Do you provide test reports or certification?
What is available varies by material and production source. Rather than claim blanket coverage, tell us what your application or your customer requires and we will confirm what can be provided for that specific material before you order.
Can this category ship together with other materials?
Yes — mixed containers across categories are standard for us rather than an exception, and for most transformer and motor builders it is the sensible way to buy.
Tell us what you need to buy
Send the grades, thicknesses and quantities — or just describe the machine you build. We reply within one working day, and we will tell you plainly if something is outside what we can supply well.