01 / SHEETS
Electrical Laminated Wood Sheets
The core base material for oil-immersed transformers rated 110 kV and above.
- Thickness 1–100 mm
- Birch or beech raw material
- Cuttable and re-machinable
The Material
Made from nature. Engineered under pressure.
Electrical laminated wood is built from natural birch and beech veneers that are steamed, precision rotary-cut and slow-dried, coated with low-dissipation phenolic resin, then hot-pressed layer upon layer at high temperature and pressure.
The result combines the machinability of wood with the mechanical strength of an engineered material: excellent dielectric performance, dimensional stability, low moisture content and long-term compatibility with transformer oil — the ideal insulation and support material for the active part of oil-immersed power transformers.
Every batch we ship is inspected for metal contamination and internal delamination before it leaves the mill — a condition written into our supply agreements, not a marketing promise.
MULTIPLE VENEERS × PHENOLIC RESIN × HOT PRESSING
1–100mm board thickness range
48 hquotation response time
ISO 9001certified partner mills
GB/T · IECdual-standard compliance
Products
A complete laminated-wood product line for transformer bodies
From semi-finished boards to CNC-machined parts — one supplier covers your whole insulation wood list, including the small items that are awkward to source separately.
02 / RODS & BOLTS
Rods, Bushings & Threaded Studs
Insulated fastening that eliminates internal potential differences from metal parts.
- Rods Ø6–25 mm, solid or bored
- Threaded studs & nuts M8–M20
- High strength, crack-free
03 / RINGS
Press Rings & Laminated Circles
Key components for winding clamping and end insulation with tight tolerances.
- Ring or segmented form
- Fully custom ID / OD / slots
- Consistent batch density
04 / MACHINED PARTS
CNC-Machined Formed Parts
Spacers, angle rings, lead supports, strips and complete transformer insulation kits.
- Full CNC machining lines
- Built to drawing / sample
- Complete body insulation sets
In development
05 / MARINE
Marine-Grade Laminated Wood
Cargo-tank support boards for LNG / LEG / LPG carriers — currently under development. Pre-orders and technical inquiries welcome.
- Target: −196°C to 80°C service
- Class certification in progress
- Contact us for roadmap & samples
06 / SPECIALTY
Specialty Industry Boards
High-dynamic, high-wear laminated wood for demanding applications.
- Drone propeller boards
- Textile needle boards
- Uniform density & balance
Technical Data
Typical properties
Typical performance per GB/T 20634 and IEC 61061 (birch-based).
| Property | Typical Value | Unit | Test Method |
|---|---|---|---|
| Density | 0.95 – 1.25 | g/cm³ | GB/T 20634 |
| Moisture content | ≤ 5 | % | GB/T 20634 |
| Bending strength (parallel) | ≥ 120 | MPa | GB/T 20634 |
| Impact strength (along grain) | ≥ 60 | kJ/m² | GB/T 20634 |
| Dissipation factor tanδ | ≤ 0.05 | — | IEC 61061 |
| Relative permittivity εr | ≤ 4.5 | — | IEC 61061 |
| Compressive strength (perp.) | ≥ 90 | MPa | GB/T 20634 |
* Values are typical references. Batch-specific data per factory test report; custom parameters and third-party test reports available on request.
How Your Order Is Made
Seven steps from veneer to finished part
1
Log selection
European birch and beech logs screened one by one for defects.
2
Steaming & rotary cutting
Steamed soft, then rotary-cut into continuous, uniform veneer.
3
Drying
Slow low-temperature drying to target moisture, stress-free.
4
Resin coating
Precision roller coating with low-dissipation phenolic resin.
5
Hot pressing
Large-format hot press bonds layers into dense panels.
6
CNC machining
CNC milling, slotting and drilling to customer drawings.
7
Inspection & dispatch
X-ray metal detection and electrical testing, then packing.
Supply & Quality
Qualified mills, our inspection, your delivery date.
We work with a small group of mills in Shandong that we have audited ourselves. We set the grade, hold the tolerance on machined parts, inspect before dispatch and handle the export paperwork — so you deal with one supplier instead of three factories.
Why Us
Why transformer builders choose LAMWOOD
◈
Several mills, one honest price
We quote from more than one qualified mill, so the grade and the price fit your project — not the other way round.
◇
Inspection before dispatch
Density, moisture, dimensions and metal contamination checked per batch, with the report attached to the shipment.
◉
Dual international standards
Material supplied to GB/T 20634 and IEC 61061 — documents ready for export.
⬡
Drawing to finished part
Boards, formed parts or a complete body insulation kit machined to your drawing, with first-article approval.
≋
Small batches welcome
Spare-part quantities and mixed containers accepted — the awkward orders a factory will not open a line for.
✳
Export handled for you
Packing, marking, certificates and shipping documents in English, from one named contact.
Applications
Where our laminated wood works
Power Transformer
Oil-immersed transformers
Press boards, spacers, strips and lead supports for the active part.
Traction
Traction & locomotive transformers
Vibration-resistant, high impact strength for rail duty.
Marine · In Development
LNG / LPG carriers
Cryogenic cargo-tank support boards — development program underway.
Specialty
Specialty industries
Drone propellers, textile needle boards and other dynamic uses.
FAQ
Frequently asked questions
What is electrical laminated wood used for?
It serves as insulation and mechanical support inside oil-immersed power transformers — press rings, spacers, lead supports and washers — and in LNG carriers and specialty industries.
Are you a factory or a trading company?
A trading company specialised in this one material. We buy from a small group of audited mills in Shandong, control the specification and inspection ourselves, and export under our own documents. You get mill pricing without managing several factories.
Which standards do you supply to?
GB/T 20634 and IEC 61061, from ISO 9001 certified mills. Every shipment is inspected for metal contamination and delamination before dispatch.
Can you machine custom parts from drawings?
Yes. We machine rings, blocks, spacers and complete insulation kits from drawings or samples, with first-article approval before the batch runs.
Do you export internationally?
Yes. We ship to transformer manufacturers worldwide and handle packing, marking, certificates and logistics. A marine-grade line for LNG carriers is in development.
Get your custom solution
Send us your drawings, specifications or standards — quotation and technical confirmation within 48 hours.
Request a Quote
Email: sales@lamwood.net
Tel: +86-3851950
Office: Liaocheng City, Shandong Province, China