Epoxy Glass Backed Mica Paper Tape

1.  Scope

    This product is made from mica paper whichbondedwith epoxy resin binder,both side backed with glass fabric under baking and pressing.
    This product has flexibility at normal condition. It has excellent dielectric property after cureed.

2.  Classification

Type Desiganation binder applications
5438－1 Epoxy glass backed mica paper tape Epoxy-tung-oil acid binder For use as wrapping insulation for coils of high voltage electric machines of large or middle capacity at operating temperature of 130℃.
DH439-1 Epoxy glass backed mica paper tape Epoxy-boron-amine complex binder
DH448-1 Epoxy glass backed mica paper tape Novolak epoxy-boron-amine complex binder For use the wrapping insulation for coils of high voltage electric machines at operating temperature of 155℃
DH449-1 Epoxy glass backed mica paper tape Novolak epoxy-boron-amine complex binder For use wrapping insulation for global impregnaling coils of HV electric machine at operating temperature of 155℃
DH5444-1 Epoxy glass backed mica paper tape Epoxy-tung-oil adhydrad modifed by malic-imide binder For use wrapping insulation for coils of large or middle HV electric machines at operating temperature of 155℃

3.  Technical requirements

3.1  Form
    The mica paper tape shall has uniform distribution of binder and free from foreign matter, bubbles, pin-holes, delamination, break of the mica paper, shrink of the glass fabric and voll loosened.
3.2  Size
3.2.1  Thickness
    The norminal thickness and admissible tolerance are shown in Table.
Nominal thickness Tolerance
between central value & nominal value between individual value & nominal value
0.10
0.14
0.17
0.20
 +/-0.02
+/-0.02
+/-0.02
+/-0.03
 +/-0.03
+/-0.03
+/-0.03
+/-0.05
3.2.2  Width
    The widths of the tape coil are: 15±1; 20±1; 25±1;30±1; 35±1mm.
    The width of the rolls shall be subjected to agreement between supplier and purchaser.
3.2.3  Curtature
    Curtature of edge of the mica paper tape is not more than 1mm.
3.2.4  Length
    The length of mica tape is indicated by the roll diameter. The roll diameter are 95+/-5mm or 115+/-5mm. The roll shall contain no more than two jions in which the length of the shortest tape is no less than 5m, with joints not exceed two. The roll with join shall be marked on it.
3.3  Compositions
    The composition of 5438-1 & 5440-1(i.e DH5440-1) is shown in Table.
Items Unit Normal value
Nominal thickness mm 0.10 0.14 0.17 0.20
Mica content
     nominal
     tolerance		 g/m2
 
 		  
65
+/-5		  
82
+8 -6		  
115
+/-9		  
150
+/-12
Glass fabric content
     Nominal value
     Tolerance		 g/m2
 
 		  
36
+/-4		  
36
+/-4		  
36
+/-4		  
40
+/-4
Binder content
     Nominal value
     Tolerance
     Reference		  
g/m2
g/m2
%		  
56
+/-7
35.5		  
74
+/-9
38.5		  
96
+/-12
38.5		  
110
+/-37
37
Mass per area at dry
     Nominal
     Tolerance		 g/m2
 
 		  
157
+/-16		  
192
+/-19		  
249
+/-25		  
300
+/-30
Volatile content % < 2
Note: Other composition of mica paper tape may be agreed between customer and supplier
    The composition of DH439-1 DH448-1 and DH449-1 is shown in Table.
Items Unit Normal value
DH439-1 DH448-1 DH449-1
Mica content % > 37 > 38 > 45
Binder content % > 35 > 36 > 32
Volatile content % < 3 < 1.5 < 3
Note: Other composition of mica paper tape may be agreed between customer and supplier.
3.4  Characteristic requirements for mica paper tape before cured.
Items Unit Normal value
5438-1 5440-1(DH5440-1) DH439-1 DH448-1 DH449-1
Flowability % > 4.5 ----
Gel time min Upon agreement between by customer and supplier
Tensile strength N/10mm <100
Flexibility min Upon agreement between by customer and supplier
Dielectric strength KV/m > 35 > 24
3.5  Characteristic requirements for the mica paper tape after cured.
    Properties of 5438-1 5440-1 mica paper tape are show in Table.
No. Items Unit Normal value
5438－1 5440－1(DH5440-1)660-1
1 Flexural strength
  Lengthwise    Normal
          At elevated temperature
  Corsswise    Normal
          At elevated temperature		 Mpa
 
 
 
 
 		  
> 180
> 30(130℃)
> 100
> 20(130℃)		  
> 200
> 40(155℃)
> 120
> 30(155℃)
2 Elastic modulus at flexure
  Lengthwise
  Crosswise		 Mpa
 
 		  
> 24.0x103
> 14.0x103		  
> 40.0x103
> 30.0x103
3 Density g/cm3 > 1.6 > 1.8
4 Dielectric strength MV/m > 35 > 40
4 Dissipationfactor 50HZ
  23℃
  130℃
  155℃		 %
 
 
 		  
< 2.0
< 4.0
 		  
< 2.0
< 4.0
< 5.0

4.  Methods of test

    According to GB5019.

5.  Shelf life

Type Shelf life
below 5℃ 5℃--20℃ 20℃--30℃
5438-1 90 30 15
5440-1(DH5440-1) 180 90 45
DH439-1
DH448-1
DH449-1		 90

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