[ Products · Insulation Paper ]
Electrical Insulation Paper
DMD, NMN, NHN, aramid and composite papers for slot and winding insulation.
Insulation paper is the largest single category we supply, and for most transformer and motor builders it is where the specification decision actually gets made. The papers in this category share a job — separating conductors and withstanding the thermal and dielectric stress inside a winding — but they differ sharply in temperature class, mechanical strength, and cost per square metre.
The practical grouping most buyers work with is by thermal class. DMD (polyester film between two polyester non-woven layers) sits at Class B and F depending on construction. NMN and NHN substitute aramid paper for one or both non-woven faces, which lifts the class to F and H respectively at a higher material cost. Aramid paper on its own is the Class H reference material and the one most often specified as a Nomex equivalent.
Where a design does not need the full thermal headroom, composite insulation papers built on pressboard and film — the 6520 and 6521 constructions — give a lower-cost route with good mechanical handling on automated winding lines.
[ Grades ]
Grades in this category
Detailed pages for each grade — with full specification tables — are in preparation. In the meantime, ask us for the specification of any grade below and we will send it.
6630
Class B (130 °C)Class B polyester film / non-woven composite — the volume slot liner material.
Detail page in preparation6641
Class F (155 °C)Class F DMD — the standard upgrade from 6630 where 155 °C is required.
Detail page in preparation6640
Class F (155 °C)Class F aramid-faced composite — higher mechanical strength than DMD at the same class.
Detail page in preparation6650
Class H (180 °C)Class H aramid / polyimide construction — the top of the composite paper range.
Detail page in preparation6520/6521
Class A / EPressboard and film composite — lower-cost route where full thermal headroom is not needed.
Detail page in preparationAramid
Class H (180 °C)Class H aramid paper — the reference material for Nomex-equivalent specifications.
Detail page in preparationNeed the specification for one of these now? Ask us directly — we will send what has been confirmed.
[ Selection ]
How to choose within this category
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Start from the thermal class you must certify to
Class B (130 °C), F (155 °C) and H (180 °C) determine which construction is admissible before cost enters the conversation. Overspecifying is common and expensive; underspecifying fails type test.
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Then check mechanical handling
Automated slot-insertion lines are harder on the material than manual winding. Tear strength and stiffness matter as much as dielectric strength here, and they differ between constructions at the same class.
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Then confirm thickness and width against your slot geometry
Slitting to your working width avoids waste and hand-trimming. Tell us the slot dimensions and we can advise on the width breakdown rather than shipping standard rolls you then have to cut.
Typical applications
[ Buying questions ]
Ordering insulation paper from China
Are you a manufacturer or a trading company for insulation paper?
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.