Industrial Electrical Engg Company

Established since 1921

NEMA LI 1-2001 Grade XX

Grade: NEMA XX (NEMA Std. LI 1-2001)

Technical Description : Bakelite Sheets of Grade XX are paper base Phenolic sheets. These Bakelite Sheets posses good electrical properties and mechanical strength. These Bakelite Sheets Of NEMA XX Grade are suitable for electrical applications except where low losses or high humidity conditions are involved. They have good machining properties and are particularly adapted general electrical insulation, radio subpanels, switch bars, etc.

Thickness : Thickness of Bakelitesheets ranges from 0.4 MM – 50.0 MM. (on special request sheet more than 50mm also can be supplied)

Size : Standard size of Bakelite sheets: 1220 x 1220mm (4 ft x 4 ft) or 2440mm x 1220mm (8ft x 4ft).

Colors : Available Bakelitesheet colors are natural brown, natural beige, dark brown and black.

Tolerance : Tolerance of thickness is as per NEMA Standards.

Technical Data for Bakelite Sheet of NEMA Grade XX

Properties

Specification

Units

Condition

Average Test Results Sample Under Test
0.5″ thick

PHYSICAL PROPERTIES
Specific Gravity

1.34

A

1.36

Water Absorption (1/4″)

0.85

%

E24/50 + D24/23

0.50

MECHANICAL PROPERTIES
Tensile strength
L.W

16000

Psi

A

18600

C.W

13000

Psi

A

14400

Impact Strength Izod
L.W

0.40

Ft-1b per

E-48/50

0.52

C.W

0.35

notch inch

0.45

Flexural Strength
L.W

15000

Psi

A

20000

C.W

14000

Psi

17000

Compressive Strength
F.W

34000

Psi

A

38000

E.W

23000

Psi

A

28000

Hardness scale

M-105

M-scale

A

M-108

ELECTRICAL PROPERTIES
Break down voltage

40

Kv

A

48

  • Edge wise (0.5″thick)

5

Kv

D-48/50

9

Flat wise (0.125″thick)

360

V/mill

A

410

Insulation Resistance

60

M.ohms

C-96/35/90

100


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