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PREPREGS: Flexible Insulating Material Class 'E' & 'F'
Polycom’s PREPREGS are made by coating/impregnating flexible
materials (Nomex®, Non-woven or Fabric) with ‘B’ stage
reactive coating of resin. Prepregs belong to insulation class
‘E’ & ‘F’.
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RESIN
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NOMEX® / NON-WOVEN / FABRIC
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RESIN
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Prepregs are tack – free at room temperature but become tacky
at 110oc to 130oc. These are converted to ‘c’ stage by heat
energy & pressure to achieve good bonding to the conductor.
The resin system depends on processing condition but usually
epoxy resin is used.
ADVANTAGES
• Highly flexible in supplied condition.
• Solid bonding capability due to the re-active stage of
materials.
• Favorable hardening times.
• Excellent winding & trouble-free machining qualities.
• Enhanced mechanical and dielectric strength.
APPLICATION
Prepregs are used for layer insulation in dry type
transformers, conductor covering of high voltage machines,
choke coils, armature insulation, etc
STORAGE
Prepregs are to be stored in dry area at a temperature of less
than 20°c and are to be used within 3 months. Sunrays &
thermal radiation is to be avoided.
AVAILABILITY
Prepregs are available in rolls of 900 mm width & in narrow
width of 20 mm onwards (multiples of 5mm).
QUALITY
CONTROL
At our works quality control is top priority. Polycom's
laminates are manufactured with the help of the latest
machinery. Our engineers ensure that products live upto the
specification. Tensile strength, elongation & BDV tests are
the part of the standard checks.
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