Complaint
Transformer insulating Pressboard
1.The Insulation Transformer Pressboard is manufactured from 100% high quality sulfated insulating wood pulp. without sizing or used fillers. This paper is highly refinded and cleaned to ensure uniform thickness and formation. It is allowed to exist for little Pinholes, Undispersed fiber bundles and Tiny defects if it doesn't effect to meet the safety requirements in the manufacturing and applications of transformers and cables.
| Items | Standard IEC(641-3-1):1992 |
| Thickness Deviation | ≤ 5.0% |
| Density | 1.10 -1.25 g/cm3 |
| Tensile strength MD | ≥105 N/mm2 |
| Tensile Strength CMD | ≥ 80 N/mm2 |
| Shrinkage MD CMD Perpendicular | ≤ 0.5% ≤ 0.7% ≤ 5.0% |
| Elongation MD CMD | ≥ 3.0% ≥ 4.0% |
| Ash Content | ≤ 1.0% |
| PH Value of Aqueous Extract | 6 - 9 |
| Oil Absorption | ≥ 9% |
| Conductivity of Aqueous Extract | ≤ 5 mS/m |
| Electrical Strength in Oil 0.5mm -1.5mm up 1.5mm -3.0mm | ≥ 40KV/mm ≥ 35 KV/mm |
| Moisture Content | ≤ 6 % |
