RAMAN BOARDS
Sigma Crepe Paper
We offer crepe paper in both Calendared and Uncalendared varieties of the required quality specifications
for electrical insulation purposes and are manufactured from electrical Kraft base paper conforming to IEC
60554-3-5. The Insulation kraft base paper is manufactured from electric grade long fiber, unbleached
sulfate kraft pulp which is totally free from size, fillers & conductive particles. The Crepe Paper confirms to
IEC 60554-3-3. Crepe paper is available in coarse & fine crepe varieties. Crepe paper is used as insulation
in distribution, power and instrument transformers. We offer these materials in natural color. The Crepe
paper is available in the form of rolls, pads & flexible tubes.
Sigma Crepe Paper in Roll Form
The Crepe paper in roll form is available in base paper thickness of 0.050, 0.075, & 0.125mm with
elongation as per customer requirement from 30 - 100%. The standard width of rolls is 500, 750 & 1500mm
with a tolerance of ± 5mm and standard roll diameter of 400mm. Rolls are supplied with a core i.d. of
76mm.
Sigma Crepe Pads
The Crepe paper is slitted into pads is available in base paper thickness of 0.050, 0.075, & 0.125mm with
elongation as per customer requirement from 30 – 100%. The width of pad varies from 15 to 50mm with a
tolerance of ± 1mm and pad diameter up to 250mm max & is supplied with a core i.d. of 50mm.
Sigma Crepe Tube
Crepe paper is available in flexible tube form in a number of different internal diameters and wall
thicknesses as per customer requirement. Standard tube length is 1000, 1200, 1800 & 2000mm.
Parameter
Min
Max
Tolerance
Tube Internal Diameter (mm)
3
40
- 0, + 0.50
Tube Wall Thickness (mm)
1
8
-0.5, + 1.0
Length of Crepe tube (mm)
1000
2000
± 30
One-stop shop for transformer insulation
RAMAN BOARDS
Sigma Crepe Paper
Technical data of different varieties of Sigma Crepe Paper
Item
Code (1)
Base
Paper
thick
ness
Base
Paper
Weight
SCP
Elong
ation
SCP
Tensile
Index
MD
SCP
Paper
Thickness
SCP
Gram
mage
Apparent
mm
g/m2
%
(3)
N.m/g
mm
g/m2
g/cc
2N5UC
0.050
40
50
40-49
0.24-0.29
61-69
0.22-0.27
5.0
5.5
20
23
2N10UC
0.050
40
100
46-54
0.28-0.36
74-84
0.24-0.30
4.0
5.3
20
24
3N3UC
0.075
60
30
55-63
0.25-0.32
87-96
0.29-0.35
4.8
5.5
26
38
3N5UC
0.075
60
50
50-60
0.29-0.35
92-99
0.27-0.32
3.8
5.7
22
33
3N7UC
0.075
60
70
56-66
0.35-0.40
110-119
0.26-0.35
3.2
5.4
20
30
3N10UC
0.075
60
100
52-62
0.36-0.44
118-128
0.27-0.34
3.6
5.4
17
31
5N10UC
0.125
100
100
54-64
0.49-0.58
200-215
0.32-0.38
3.2
7.0
17
36
1. 1st Digit is thickness of base paper in mil.
2.Suffix'N' is Normal Density Paper
3. 3rd & 4th digits multiply by 10 to obtain % elongation.
4. Suffix 'UC' is Un Calendared in unstretched condition.
5.Elongation value will within ± 15%.
6. Crepe can be made in any elongation desired from 30% 100%.
7. Thickness- caliper of un calendared crepe is not controlled.
SCP
Density
Sigma Crepe Paper
Dielectric Strength
Dielectric
Dielectric
Strength - Air
Strength - Oil
kV/
kV/
kV/
kV/
mm
5-Layer mm 5-Layer
8. Weight of Crepe paper is subjected to variation due to
base paper & elongation.
9. Apparent density calculations are based on nominal
crepe weight & caliper
10. Ash Content less than 1%
11. Moisture content dry basis – less than 8%.
12. Above data is the values obtained during testing.
13. Dielectric strength is measured with 5 layers of crepe
paper in air & Oil.
Other varieties of crepe products in different thickness & elongation can be offered on request.
These values do not constitute specification of our products and also provided are values in accordance with the IEC specification. Since test conditions cannot always duplicate actual field
installations or end use, Raman Boards make no warranties with respect to such data and assume no responsibility for performance characteristics resulting from conditions which may differ
from those used in laboratory tests.
One-stop shop for transformer insulation