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Hanyao quality Thermally upgraded kraft paper is a special kind of insulation material, the property is improved on the basis of normal kraft paper.The paper is upgraded by adding nitrogen to the pulp. The nitrogen replaces the oxygen, which prevents it from oxidizing and aging the paper at high temperatures.It enables the transformer to operate normally at higher temperatures and prolongs the service life of the transformer.For many years, this technology has been monopolized by world-renowned companies such as Switzerland's Weidmann. While other companies can produce some heat-resistant nitrogen insulation paper, a lack of proprietary technology keeps costs and prices high..Hanyao has been regularly supplying TU paper for many years and has been verified and affirmed by customers.
| No. | Item | unit | Requirement | ||||
| 1 | Thickness | μm | 50±10% | 65±10% | 85±10% | 125±7% | |
| 2 | Density | g/cm³ | 0.9-1.00 | 0.9-1.00 | 0.9-1.00 | 0.9-1.00 | |
| 3 | Tensile strength ≥ | MD | kN/m | 3.8 | 5 | 6.5 | 10.0 |
| CD | 1.6 | 2 | 2.5 | 4.0 | |||
| 4 | Elongation ≥ | MD | % | 2.0 | 2.0 | 2.0 | 2.0 |
| CD | 4.0 | 4.0 | 4.0 | 4.0 | |||
| 5 | Tearing resistance ≥ | CD | mN.m2/g | 7.0 | 7.0 | 7.0 | 7.0 |
| 6 | Electrical strength(AC) ≥ | kV/mm | 9.0 | 9.0 | 9.0 | 9.0 | |
| 7 | pH of water extract | / | 6.0-8.0 | 6.0-8.0 | 6.0-8.0 | 6.0-8.0 | |
| 8 | Conductivity of water extract ≤ | mS/m | 10.0 | 10.0 | 10.0 | 10.0 | |
| 9 | Air permeability ≤ | um/(Pa.s) | 0.20 | 0.20 | 0.20 | 0.20 | |
| 10 | Ash content ≤ | % | 0.70 | 0.70 | 0.70 | 0.70 | |
| 11 | Moisture content ≤ | % | 9.0 | 9.0 | 9.0 | 9.0 | |
| 12 | Nitrogen content | % | 1.1-2.3 | 1.1-2.3 | 1.1-2.3 | 1.1-2.3 | |
| 13 | Age remaining rate of tensile strength | % | 75 | 75 | 75 | 75 | |
| 14 | Degree of polymerization | / | / | / | / | / | |
Disclaimer: The performance figures, parameters, and features described are typical values under specific test conditions and may vary in actual applications. They do not constitute a warranty or guarantee of performance under all conditions. Users are responsible for verifying the suitability of the product for their intended application.
1.Thermally upgraded kraft paper is able to withstand temperature upto 120℃
2.It is made from 100% electric grade unbleached pulp.
3.It has both excellent electrical and mechanical strength,ensuring stability of transformer winding.
4. It is used as insulation between coils in power transformer and distribution transformer.
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