Industrial Electrical Engg Company

Established since 1921

NEMA LI 1-2001 Grade LE

Technical Description:
Bakelite Sheets of NEMA Grade LE are fabric base Phenolic sheets.
Bakelite Sheets of this grade LE posses superior impact resistance when compared to paper based Bakelite products but have lower mechanical strength than material with glass substrates, they are suited for fine machining and in electrical applications requiring good moisture resistance. These Bakelite sheets posses good dielectric properties.

Thickness:
Thickness of Bakelite sheets ranges from 0.4 MM – 20.0 MM.

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

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

Tolerance:
Tolerance of thickness is as per NEMA Standards.

Technical Data for Bakelite Sheets of NEMA Grade LE

Properties Units

Test Methods

ASTM

Condition

Average Test Results

Values As Per

NEMA LI 1-2001

Mechanical
Tensile Strength ksi

D229

A

LW

12.5

12.0

CW

9.0

8.5

Flexural Strength(1/2” thick) ksi

D229

A

LW

16.2

15.0 Min

CW

13.8

13.5 Min

Izod Impact

(1/2” Thick)

 

D229

 

E.48/50

LW

Ft-lb/in

1.35

1.25 Min

CW

(notch)

1.10

1.0 Min

Bonding Strength

(1/2” Thick)

 

Ibs

D229

 

A

1650

1600

1550

1500

Maximum Water Absorption(1/2” Thick)

%

D229

D-24/23

0.7

0.95 Max

Density

gm/cc

1.34

1.33

Electrical
Min. Breakdown

Voltage

(1/4” thick)

Kv

 

D229

 

A

 

50

 

40.0 Min

D-24/23

5

3.0 Min

Insulation Resistance

Mohms

D229

C-96/35-90

30

Electriical Strength Perpendicular to laminated sheet (0.125” Thick)

V/ mil

 

D229

 

Step by Step

 

240

 

220


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