Uncalendered Aramid Paper X611 (X-Fiper) – Manufacturer, Supplier & Exporter in India
X611, also known as the X-Fiper series of uncalendered aramid paper, is a soft non-calendered meta-aramid insulating paper meant for use in high temperature electrical applications where resin uptake is critical. By virtue of not being subjected to the pressing under heavy rollers in its calendering process, this grade of paper retains a highly porous nature due to which the varnish and resin uptake ability is much higher as compared to that of any other calendar grade. The very purpose of having an uncalendered grade is for impregnation purposes; otherwise the paper would have been calendared and made more suitable only for surface impregnation.
As one of the manufacturers, suppliers and exporters of aramid paper in India, we provide a wide variety of this product in thicknesses ranging from 5 to 23 mil (0.13 – 0.58 mm) and widths from 10 mm to 1000 mm so that slitting could be done to whatever specification of coil/slot/wrap a winding shop desires. This grade of aramid paper has UL certification, operates in the temperature range of 180 to 220°C (Class H/R Insulation) and qualifies tests as per GB/T451.3. Dielectric strength remains constant at 5 kV/mm regardless of the thickness, starting from the thinnest 5 mil sheets (36 g/m²) to the thickest 23 mil sheets (190 g/m²).
The unique role of X611 in a bill of materials comes from the application of varnish impregnation in windings of the traction motors, industrial motors, dry-type transformers, and coils of rotating machines where it is necessary that the resin migrates into the paper and not only covers it. X611 is frequently chosen for use in slot liners, phase and layer insulation, and for any electrical construction where both dielectric performance and mechanical flexibility are important, due to its flexibility and elasticity.
If your application calls for a smoother, denser surface finish instead of maximum porosity, it’s worth comparing X611 against our broader Aramid Papers range, which also includes the calendared Uncalendered Aramid Paper YT 511 – Metastar and the DuPont-branded Uncalendered Nomex Aramid Paper 411 — both built on the same uncalendered principle but with different mechanical and thermal profiles. For designs where aramid paper is combined with polyester film for extra dielectric strength, our Laminated Insulation Paper Composites range (NMN, NHN, AHA type laminates) is the next step up. X611 is also frequently used alongside Insulation Tapes High Temperature for securing windings after impregnation, and with Insulating Varnishes and Thinner during the actual resin-dipping process.
For applications where the winding also needs a rigid backing layer, engineers often pair X611 with our Insulation Pressboard range, and where the finished assembly needs a further dielectric barrier, our Polyester Films Insulation and Polyimide film ranges are worth reviewing. Harnawa supplies X611 in bulk rolls and custom-slit widths to OEMs and rewinding units across India, and exports to international buyers with full UL, CE, RoHS, REACH and ISO 9001:2015 documentation.
Key Applications of Aramid Paper X611
- Slot liners and phase/layer insulation in motors, generators and alternators
- Varnish-impregnated coil and winding insulation for dry-type transformers
- High-temperature (Class H/R) electrical assemblies requiring deep resin bonding
- Rewinding and repair work where a soft, formable paper is needed around tight radii
- Base substrate for laminated insulation constructions
Why Source X611 from Harnawa
Harnawa Insulations supplies X611 insulating material in India on a reliable basis, with consistent electrical insulation properties in each consignment, which means the buyer does not have to re-qualify the material each time he orders. The rolls are slit in accordance with the specific width demanded by the customer and not to any fixed size; each shipment is also certified as per UL, CE, RoHS, REACH, and ISO 9001:2015 standards.
FAQs – Uncalendered Aramid Paper X611
Q1. Why is X611 uncalendered and what difference will it make?
The paper is not subjected to heat and pressure to give it a compact, dense structure. In effect, the porous nature of the fibers of this material allows varnish and resin to soak into the structure of the material as opposed to sitting on top of it.
Q2. What are the available thicknesses and widths of X611?
X611 is supplied in thickness ranging from 5 to 23 mil (0.13 mm to 0.58 mm) and is also available in widths ranging from 10 mm to 1000 mm.
Q3. What temperature class of insulation is X611 rated?
X611 is rated for H/R insulation, good for use in temperatures between 180-220°C as per GB/T451.3.
Q4. Can X611 be used in motor and transformer winding insulation?
Certainly – due to its high porosity and resins absorptive ability it is ideal for use in slot insulation and layer insulation as well as varnish impregnated motors, generators and transformers.
Q5. Does Harnawa export X611 out of India?
Harnawa Insulations manufacture, supply and export Aramid Paper X611 both in India and overseas markets, UL, CE, RoHS, REACH and ISO 9001:2015 certified.
