Polifibra Folien Handelsgesellschaft mbH - Deutschland
Polifibra Folien Handelsgesellschaft mbH - Deutschland
Polifibra group
Films for cables
Polyester film based flexible composites
Shields for EMI-RFI interference in electronic device
Spiral tubes and caps
PRE-PREG
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Publishing details
 

Pre-Preg

Therm-H is a DMD laminate (Polyester non woven fibermat/polyester  film/ polyester non woven fibermat) that is 100% pre-preg saturated with class F EP resins at B-stage (IEC draft 464-1).
Before curing Therm-H is slippery for an easy machinability.
The B-stage resin cures at time and temperature according to the recommended cycles.
After curing, the coating of Therm-H is rated to class F temperature (draft IEC 464-3.2 type 155) and sticks permanently the insulation to windings and core.
Typical properties
Type D 50 D 75 D 100 D 125 D 190 D 250 D 350
Construction microns 65/50/65 65/75/65 56/100/65 65/125/65 65/190/65 65/250/65 65/350/65
Overall thickness (nominal) microns 195 220 245 270 335 395 495
Nominal weight g/m˛ 190 225 260 295 386 470 610
Yield m˛/kg 5,25 4,45 3,85 3,40 2,60 2,10 1,65
Dielectric strength
as supplied kV 8 9 11 12 15 17 20
after bending at 180° 7 8 10 11 4 16 19
Elongation % 20
Melting Point °C 260
Shrinkage at 150°C % <2
Standard reel width mm 1000
ID/OD standard rolls mm 76 x 330



left: Bond time (minutes)
bottom: Temperature °C

Diakraft and Diafilm

Diakraft and Diafilm are partial coated Prepregs. They have been developed for the special application at for example gas-cooled transformers. The  pattern coating system covers about 36% of the surface and allows the cooling medium to do it's job, also there is a very good bonding between the copper layers by the cured coating.
Diakraft Diafilm
Properties Heat curable epoxy pattern coated supercalendered transformer paper. Heat curable epoxy pattern coated Polyester Film
Substrate Electrical Grade Paper 100% Kraft Electrical Grade Polyester Film
Insulating Class A B
Colour Natural pressboard Haze
Thickness (plusminus.gif (873 Byte) 10%) 45 75 23 50
Density g/cm˛ 1 1,4
Grammage (plusminus.gif (873 Byte) 10%) 45 75 32 70
Moisture max. 7 < 0,8
PH 6,5/8 Neutral
Elongation
MD%
TD%
min. 2
min. 5
100
70
Tensile strenght MD N/mm˛ 90 80 145
Breakdown voltage kV 4 6 4 8
Conductivity mS/m 2 N. A.
Shrinkage (24h /120°C)
MD%
TD%		 1,2 2
Querrichtung % 2 2



B-Stage Resin for Diakraft and Diafilm

Resin Type modified epoxy resin, phenol free
Colour pink
Pattern covering % per side Ca. 36
Thickness per side 12-16
Curing cycles see graph
Storage (21°C/50% RH) Virtually unlimited



left: Bond Time (minutes)
bottom: Temperature °C

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