| ITEM | TYPICAL VALUES | MATTER OF FACT | |
| Thickness: mm（crepe paper single layer） | 0.35±0.05 | 0.379 (0.378; 0.379, 0.379) | |
| Length : mm | -5%+5% | ±5% | |
| Inner diameter: | +0.5/-0 mm | 0-0.4mm | |
| Outer diameter: | +1.0/-0 mm | 0-0.7mm | |
| Moisture content ,﹪ | ≤8﹪ | 7.2 | |
| PH water extract: | 6.0 to 8.0 | 6.4 | |
| Ash content,﹪ maximum | 1﹪ | 0.35 | |
| Tensile strength, N/mm2 （crepe paper） Machine direction: Cross machine direction: | ＞3.71 ＞5.6 | 6.0 7.1 | |
| Crepe rate: % | ＞50% | 52% | |
| Conductivity of aqueous extract: (Base paper)Ms/m | ≤8.0 | 4.7 | |
| Dielectric breakdown: crepe paper （volts/single layer, dry test） | ≥1000 | 1200 (1200; 1100; 1300) | |
| Dielectric breakdown: crepe paper （volts/wall Thk, dry test） | Thickness 1mm | ≥2700 | |
| Thickness 1.5mm | ≥4000 | ≥5000 | |
| Thickness ≥2mm | ≥5400 | ≥5000 | |
The insulating crepe tube produced by the insulating crepe tube automatic machine has advantages that manual and semi-automatic machines do not have at all. As for the same inner diameter and out diameter, in accordance with the design principle of the transformer, the higher the number of turns is, the better the insulation will be. Meanwhile, the more tightly it is wrapped, the higher its elasticity, flexibility and bending resistance will be. Accordingly, with the same specifications and the same number of pieces, the hand-rolled crepe tube is loose because there are fewer layers and the weight of its finished product is only half of that of the automatic products. At the same time, the hand-rolled crepe tube does not have any flexibility and strength at all. Our factory researched and developed successful glue. After many improvements, it is increasingly mature. Our factory adopts high-grade pure resin, high reaction temperature and quality production without any impurities and finally, the PVA-based electrical insulation glue with high purity and high effective constituents is produced, which has extremely strong bond strength. Even if they are strongly distorted, beat on hard objects, or torn destructively. And such products have no harms to the transformer insulation. This special PVA glue can meet the demanding requirements for imported products.