NOMEX 464

NOMEX 464 is a single-sided coated (Resin-Coated) special type within the Nomex insulation paper series of DuPont. It is coated on one side of the standard Nomex aramid paper with a layer of thermosetting resin (typically polyester or epoxy adhesives), giving it self-adhesion and enhanced composite properties.

NOMEX 464 technical data sheet

Property Spec.	UNIT	MIN	TYPICAL	MAX	TEST METHOD
Thickness Average	mil	1.3	1.57	1.81	ASTM D374
Thickness Average	micron	33	40	46	ASTM D374
Basis Weight Average	oz/yd2	0.62	0.76	0.89	ASTM D646
Basis Weight Average	g/m2	21	25.6	30.1	ASTM D646
Density Average	g/cm3	0.5	0.64	0.8	ASTM D646
Dielectric Strength	V/mil	254			ASTM D149
Dielectric Strength	kV/mm	10			ASTM D149
MD Tensile Strength	lb/inch	5			ASTM D828
MD Tensile Strength	N/cm	8.8			ASTM D828
CD Tensile Strength	lb/inch	4.5			ASTM D828
CD Tensile Strength	N/cm	7.8			ASTM D828
MD Elongation	%	2			ASTM D828
CD Elongation	%	1.7			ASTM D828
MD Initial Tear Resistance	lb	0.2			ASTM D1004
MD Initial Tear Resistance	N	0.8			ASTM D1004
CD Initial Tear Resistance	lb	0.1			ASTM D1004
CD Initial Tear Resistance	N	0.4			ASTM D1004

NOMEX 464 features

Single-sided resin coating: One side of the paper is smooth and coated with an active resin layer, while the other side retains the original fibrous texture of Nomex paper.
Thermal activation self-adhesive: Under heating and pressure conditions (typically 150°C–180°C), the coated resin melts and cures, firmly adhering 464 to copper conductors, iron cores, interlayer gaskets, or other insulating materials.
Excellent interlayer adhesion: After curing, it forms an extremely strong integrated insulation structure, effectively preventing the coil from shifting or wearing out under electromagnetic force vibration.
Preservation of Nomex substrate properties: The uncoated side still maintains H-class (220°C) heat resistance, high mechanical strength, and flame retardancy.
Improvement of impregnation compatibility: The resin coating is well compatible with most conventional insulating resins (VPI resin), and there is no risk of delamination after curing.

NOMEX 464 applications

Dry-type transformer interlayer insulation: As the interlayer pad for the coil layers, it is thermally pressed and firmly bonded to the wires, preventing short circuits and vibration noise.
Motor slot insulation fixation: The coated surface faces the core or wedge, and is adhered and fixed after heating, simplifying the assembly process.
Lead wire wrapping and joint insulation: After winding, it achieves self-adhesive sealing through local heating, without the need for additional tape.
Composite material substrate: Heat-pressed with polyester film (Mylar) and polyimide film (Kapton) to manufacture multi-layer insulation structures such as NMN and NHN.
Preformed insulation parts: Used for manufacturing fixed-shaped end baffles and phase-spacing plates, and after heat pressing to shape, the dimensions remain stable.