Uncalendered Nomex Aramid Paper 411 – DuPont

Uncalendered Nomex® Aramid Paper 411 – DuPont | High-Porosity Electrical Insulation Paper

Uncalendered Nomex® Aramid Paper 411 by DuPont is a high-performance electrical insulation material designed for applications that require excellent thermal resistance, high dielectric strength, and superior resin absorption. Its uncalendered structure provides enhanced porosity, allowing varnishes and resins to penetrate deeply for improved bonding and long-term insulation reliability.

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Uncalendered Nomex Aramid Paper 411 - DuPont

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Nomex® 411 is widely used in electric motors, transformers, generators, and other electrical equipment where efficient impregnation and thermal endurance are essential. It offers outstanding resistance to heat aging, chemicals, and mechanical stress, ensuring consistent performance under demanding operating conditions. The flexible yet durable construction makes it ideal for slot insulation, phase insulation, interlayer insulation, and insulation barrier applications.

Trusted for quality and performance, Uncalendered Nomex® Aramid Paper 411 – DuPont delivers a reliable, industry-proven insulation solution for modern electrical and industrial manufacturing needs.

Product Details

Brand

Uncalendered Nomex® Aramid Paper 411 by DuPont

Insulation Class

‘H’ & ‘R’

Temperature Rang(°C)

180 – 220 °C

Color

Natural Off White

Thickness (mm)

0.05 – 0.76 mm (2 to 30 mil)

Surface

Smoothly Calendared

Width

10 mm to 1000 mm

Property	Unit	5	7	10	15	23	Test Method
Dielectric Strength (AC Rapid Rise)	kV/mm	9	9	9	7	7	ASTM D149
Full Wave Impulse	kV/mm	18	18	18	16	16	ASTM D3426
Dielectric Constant	60 Hz	1.2	1.2	1.2	1.3	1.3	ASTM D150
Dielectric Constant	1 kHz	1.3	1.3	1.3	1.4	1.4	ASTM D150
Dissipation Factor	60 Hz (x10⁻³)	3	3	3	4	5	ASTM D150
Dissipation Factor	1 kHz (x10⁻³)	5	5	5	5	5	ASTM D150

Property	Unit	5	7	10	15	23	Test Method
Tensile Strength (MD)	N/cm	18	27	32	47	57	ASTM D828
Tensile Strength (XD)	N/cm	9	14	17	29	39	ASTM D828
Elongation (MD)	%	3.7	3.4	3.6	3.2	2.4	ASTM D828
Elongation (XD)	%	5.1	5.0	5.3	4.6	3.6	ASTM D828
Basis Weight	g/m²	42	65	80	133	202	ASTM D646
Density	g/cc	0.30	0.32	0.31	0.32	0.29
Elmendorf Tear (MD)	N	1.0	1.6	N/A	4.2	7.2	TAPPI T414
Elmendorf Tear (XD)	N	N/A	N/A	N/A	5.5	8.3	TAPPI T414
Shrinkage at 240 °C (MD)	%	0.6	0.6	0.5	0.5	0.3	IEC 60819-2
Shrinkage at 240 °C (XD)	%	0.3	0.4	0.1	0.0	0.0	IEC 60819-2

Insulation Class	—	220 °C
UL 94 Flame Class	—	V-0 / VTM-0
Limiting Oxygen Index (LOI)	%	28.5 (RT) / 21.8 (220 °C)
Relative Thermal Index (RTI)	°C	220 (Electrical & Mechanical)
Standard	—	IEC 60819-3-3 Type 3