Flexible Electrical Insulation Material DMD CLASS F Insulating Paper
DMD is made of composite polyester film with 2 layers of non-woven fabric, it has good mechanical properties and electrical properties. DMD is mainly used as slot insulation and phase insulation material in high/low voltage motor, and also can be used as layer insulation or end insulation material in transformer.
Description
Brief introduction of the DMD insulation paper
DMD flexible laminates is a three-layer flexible composite material. It is made by bonding both sides of non-woven polyester fabric with polyester films with F-grade or B-grade adhesive.
About the Yaan Polyester Film: It is made from Polyethylene terephthalate by casting & Biaxially oriented. It is widely used for the end wrap insulation, liner insulation of electrical oils, electromagnetic wire wrap insulation, cable wrapping on motor, transformer or other electrical appliances.
| Item | Unit | Requirement | |||||||||
| Nominal thickness | mm | 0.15 | 0.18 | 0.2 | 0.23 | 0.25 | 0.3 | 0.35 | 0.4 | 0.45 | |
| Thickness tolerance | mm | ±0.02 | ±0.025 | ±0.03 | ±0.03 | ±0.03 | ±0.03 | ±0.035 | ±0.04 | ±0.045 | |
| Grammage | g/m2 | 140±20 | 190±28 | 220±33 | 260±39 | 300±45 | 350±52 | 425±63 | 500±75 | 560±84 | |
| Film nominal thickness | um | 50 | 75 | 100 | 125 | 150 | 190 | 250 | 300 | 350 | |
| Tensile strength | MD no bending | N/10mm | ≥80 | ≥120 | ≥140 | ≥180 | ≥200 | ≥270 | ≥320 | ≥340 | ≥370 |
| MD after bending | ≥80 | ≥105 | ≥120 | ≥150 | ≥170 | ≥200 | ≥300 | ≥320 | ≥350 | ||
| TD no bending | ≥80 | ≥105 | ≥120 | ≥150 | ≥170 | ≥200 | ≥300 | ≥320 | ≥350 | ||
| TD after bending | ≥70 | ≥90 | ≥100 | ≥120 | ≥130 | ≥150 | ≥200 | ≥220 | ≥250 | ||
| Elongation | MD no bending | % | ≥15 | ≥5 | ≥5 | ||||||
| MD after bending | ≥10 | ≥5 | ≥3 | ||||||||
| TD no bending | ≥20 | ≥5 | ≥5 | ||||||||
| TD after bending | ≥10 | ≥5 | ≥2 | ||||||||
| Breakdown voltage | No bending | KV | ≥6 | ≥7 | ≥9 | ≥10 | ≥12 | ≥15 | ≥18 | ≥20 | ≥22 |
| Delamination | — | No Delamination, no bubble or other defects | |||||||||
| Heat affected（155±2℃） 10min | No Delamination, no bubble, no adhesive flow | ||||||||||
| Long-term heat resistance | ≥130 | ||||||||||
| （temperature index TI） | |||||||||||
| Weight and area conversion | m2/Kg | 6.37 | 5.21 | 4.41 | 3.82 | 3.37 | 2.86 | 2.29 | 1.97 | 1.73 | |
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