Insulation Paper
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NOMEXâ Paper 200°C ~ 330°C

Type 410 is a calendered insulation paper which offers high inherent dielectric strength, mechanical toughness, flexibility and resilience.

Type 410 is the original form of NOMEXâ paper, and is widely used in a majority of electrical equipment applications. Available in 11 thicknesses (2 to 30 mils, or. 05 to .76mm), Type 410 is used in almost every known electrical sheet insulation application.

Inherent dielectric strength
In densified form, NOMEXâ aramid products withstand short term electrical stresses of 450 to 1000 V/mil (18 to 40 kV/mm) depending on product type and thickness, with no need for further treatment with varnishes or resins.

Mechanical toughness
Densified NOMEXâ products are strong, resilient and (in the thinner grades) flexible, with good resistance to tearing and abrasion.

Thermal stability
Temperatures up to 200°C (390°F) have little or no effect on the electrical and mechanical properties of NOMEXâ products, and useful values are retained at considerably higher temperatures.
Furthermore, these useful properties are maintained for at least 10 years of continuous exposure at 220°C (430°F)

Chemical compatibility
 NOMEXâ is essentially unaffected by most solvents, and is unusually resistant to attack by acids and alkalies. It is compatible with all classes of varnishes and adhesives, transformer fluids, Iubricating oil, and refrigerant. Since NOMEXâ are not digestible, they are not attacked by insects, fungi or molds.

Moisture insensitivity
In equilibrium at 95 percent relative humidity, densified NOMEXâ papers and pressboards maintain 90 percent of their bonedry dielectric strength while many mechanical properties are actually improved.

Non-toxic/flame resistant
NOMEXâ products will not produce any known toxic reactions in humans or animals, or melt or support combustion in air. NOMEXâ products are available which meet UL94V-O requirements. Material Safety Data Sheets (MSDS) are available upon request, by calling (800) 453-8527.
NOMEXâ papers and pressborads increase reliability and extend life of motors and generators

Better thermal protection:
Use of NOMEXâ for ground insulation can prevent premature motor failure and equipment downtime. This is because NOMEXâ does not shrink, embrittle, soften or melt during short-term exposure to temperatures as high as 300°C (570°F) and mainains good insulating properties continuously at 220°C (430°F) for 10 years. Motors may encounter temperatures considerably above their design ratings due to:

  • Overloads, caused by reduced speeds or stalled rotors
  • Restricted cooling (especially in dirty environments)
  • Reduced line voltage or unbalanced phases
  • Frequent starts and stops
  • Unusually high ambient temperatures

Because of its superior thermal properties, NOMEXâ can enhance motor performance and reliability.

Table / Typical electrical Properties:

Product

 

410

410

410

410

410

410

410

410

410

410

410

Nominal Thickness

mils

2

3

5

7

10

12

15

20

24

29

30

Dielectric Strength,

                       

AC Rapid Rise

V/mil

435

540

635

845

800

840

810

790

820

755

695

(ASTM D-149)

kV/mm

17

21

25

33

31

33

32

31

32

30

27

Full Wave Impuls

V/mil

1000

1000

1400

1400

1600

N/A

1400

1400

N/A

N/A

1250

(ASTM D-3426)

kV/mm

39

39

55

55

63

N/A

55

55

N/A

N/A

49

Dielectric Constant,

60 Hz

1.6

1.6

2.4

2.7

2.7

2.9

3.2

3.4

3.7

3.7

3.7

(ASTM D-150)

                       

Dielectric Factor,

60 Hz

.004

.005

.006

.006

.006

.007

.007

.007

.007

.007

.007

(ASTM D-150)

                       

NOMEXâ is a registered trademark of E. I. du Pont de Nemours and Company.