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 |