SynWrap – Wrapping Tapes Polyglas tape

Polyglas tapes are winding tapes with a carrier made of parallel glass yarns, pre-impregnated with a special thermosetting polyesterimide resin. The banding tape forms a mechanical loop to hold coils in place against centrifugal forces and replace metal armature or steel bands.

Polyglas tape can be used for electrical insulation; it can be thermally self-bonded and is characterised by an extremely high mechanical resistance, high tensile strength and a very low loss.

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Application

Polyglas tapes are suitable for banding all kind of motor rotor coils and overhangs. They are used for tying cores, coils and columns of dry and oil transformers, for collectors, and for bracing and locking any kind of form wound coils and parts. The banding tape holds the parts safely in place during the conditions experienced during long-term operation. Polyglas tape is supplied in B-stage (semi-cured), so it is smooth and easy to apply. When curing, the resin flows to fill any voids and join the layers of tape to one homogeneous, stiff and hard mass.

 The main advantages of Polyglas tapes in comparison to steel wire bandages are:

  • Electrical insulating material
  • Outstanding long-term (fatigue) mechanical properties
  • Eddy currents proof material, locally not exposed to overheating
  • Elimination of flashovers among windings and steel bands
  • Saving in insulating materials and in weight
  • Saving in material costs and in process costs through reduced application time
  • Eliminates danger of lashing metal if broken under stress during application

Standards

Type P30 - class F (155 °C)
Type H200 - class H (180 °C)
RoHS compliant according to 2011/65/EU

Delivery forms

Length 100 m or 200 m
Standard width: 6.5, 10, 20, 25, 30, 38, 50 mm
Other widths on request

Hardening

Note for hardening:

The necessary time to achieve the requested temperature of the object is not included into the table.

 

Processing

Before opening the packing, let the tape reach room temperature. By using a suitable tensioning device, the tape has to be applied at a temperature ranging from 80 to 100 °C as well as with a banding tension of 800-1000 N/cm. Banding speed of around 10 m/min to be applied.

This procedure is a must to get the best banding performances and to obtain an optimal residual banding tension in the cured bandage.

A proper locking of tape to secure the pull applied during bandage must be performed by fastening the tape before starting banding and by fixing/soldering the end of the tape (e.g. hot iron). To obtain a shiny surface after curing, a masking procedure with normal or shrinkable polyester foil is suggested. This also allows a controlled flow of the resin during curing, avoiding any bubble or lump on the surface.

Once any masking material is removed, the grinding operations must be strictly limited to the external surface of banding and a thickness of a few tenths of mils. It is strongly recommended to enquire specialised suppliers and manufacturers of tooling for boring, grinding and shaping the surface.

Technical data

Pre curing mechanical
Property Unit of measure P30  H200  Test method 
Thickness  mm  0.30 ± 0.03 0.30 ± 0.03 IEC 60371-2
Weight  g/m²  550 ± 50 550 ± 50 IEC 60371-2
Volatile components  1.25 ± 0.75 1.25 ± 0.75 IEC 60371-2 (5 min/ 150°C)
Resin content  26 ± 2 26 ± 2 IEC 60371-2
Tensile strength  N/cm  ≥ 2500 ≥2500 IEC 60394-2
Storage temperature and shelf life at 10 °C  Monate  18 18  
Storage temperature and shelf life at 20 °C  Monate  6 6  
After curing mechanical
Property Unit of measure P30  H200  Test method 
Thickness  mm  0.28 ± 0.03 0.28 ± 0.03  
Minimal tear force  N/cm  ≥ 2500 ≥ 2700 at 20°C *
Minimal tear force  N/cm  ≥ 1800 ≥ 1800 Thermal class F, resp. H *
After curing thermal
Property Unit of measure P30  H200  Test method 
Thermal class  °C  155 200 IEC 60085
Curing
Property Unit of measure 160°C  150 °C  135 °C  120 °C 
Polymerisation time  P30  2.5 h 3 h 5 h 14 h
Polymerisation time  H200  2.5 h 3 h 5 h 14 h