Presspaper PSP3055 (Pressspan) is a special product on the basis of the purest wood cellulose fibres. Without any additional binding agents, these are made up into a fibrous web and then pressed. Due to its high chemical purity, presspaper PSP3055 (presspan) is particularly suited as an insulating material in electric machines, capacitors, motors, etc., and especially in oil-cooled transformers.
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Features
· Insulation class A (105 °C)
· Calendered presspaper, good forming properties, 100 % sulphate pulp
· Colour natural
· High purity and high oil-absorption
· High electric dielectric strength
· Presspaper can be coated with baked enamel or laminated with Polyester Film
· Good compatibility with liquid dielectrics
Applications
As interlayer insulation in liquid-filled transformers, motors
Available
Thickness: 0.10mm – 0.50mm
Both in roll and sheet are available
Width: 500mm – 1250mm
Special sizes are available on request
Different colours are available on request
Technical Data
| Test standard * | Measured value | Standard value | |
| Thickness tolerance | IEC 641-2 | ±10 % | ±10 % |
| Apparent density | IEC 641-2 | 1.1 g/cm³ | 1.0 - 1.2 g/cm³ |
| Min. tensile strength M.D, unfolded | IEC 641-2 | 90 N/mm² | 80 N/mm² |
| Min. tensile strength C.M.D, unfolded | IEC 641-2 | 50 N/mm² | 40 N/mm² |
| Min. elongation M.D, unfolded | IEC 641-2 | 6.50% | 6% |
| Min. elongation C.M.D, unfolded | IEC 641-2 | 13% | 12% |
| Max. moisture content | IEC 641-2 | 8% | 8% |
| Max. ash content | IEC 641-2 | 0.50% | 1% |
| pH of aqueous extract | IEC 641-2 | 7-9 | 6-9 |
| Max. shrinkage M.D | IEC 641-2 | 0.70% | 1% |
| Max. shrinkage C.M.D | IEC 641-2 | 1.20% | 1.50% |
| Max. thickness shrinkage | IEC 641-2 | 5% | 7% |
| Min. oil absorption | IEC 641-2 | 25% | 12% |
| Min. breakdown voltage in air, unfolded, normalized | IEC 641-2 | 10 kV/mm | 9 kV/mm |
| Min. breakdown voltage in oil | IEC 641-2 | 60 kV/mm | 40 kV/mm |
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