Mylar polyester film
Mylar® polyester film retains good physical properties over a wide temperature range (–70 to 150°C [–94 to 302°F]), and it is also used at temperatures from –250 to 200°C (–418 to 392°F) when the physical requirements are not as demanding.
Some physical and thermal properties of Mylar® are summarized in Table 1. Detailed information and other physical and thermal properties are described in the remaining pages of this bulletin.
- Related Products
Dobeckan ® ST NV 075-4475
Electrical Insulation System
Single component, thermal class 200
Dobeckan ® ST NV 075-4475 is a single component impregnating resin without solvents and reactive thinners like styrene and vinyltoluene, that combines rapid cure with excellent tank stability.
Dobeckan ® ST NV 075-4475 has been designed to give very high degree of resilience to absorb thermal and mechanical shocks, which make it an ideal impregnant for Class 'H' systems ( when used in conjunction with other suitable conductor and insulation products).
Dobeckan ® ST NV 075-4475 is classified as a non hazardous material, enabling simple transport, storage and handling.
The components fulfil the directives 2011/65/EU, 2003/11/EC and 2006/121/EC. The raw materials of the components are pre-registered according to the directive No. 1907/2006/EC (REACH). The system does not contain by recipe substances listed in Article 57/Anex XIV 1907/2006/EC from 9th October 2008 (SVHC).
Areas of application
Typical applications for Dobeckan ® ST NV 075-4475 are:
- Transformers of different sizes.
TRANSFORMER BOARDS – Laminated Pressboard
Figeholm Elboard HDLP and HDLC
HDLP is laminated with polyester resin (dry process). It has the higher mechanical strength of the two materials. Water diffusion and oil impregnation across the laminations is virtually impossible. Processing of large bodies of the material may therefore be facilitated by drilling
diffusion holes through the material.
HDLC is laminated with casein glue (water-based). The mechanical strength is somewhat lower than for HDLP. The original moisture content of the material as delivered is higher than for HDLP, but diffusion of moisture and oil impregnation is possible (although slow) across the laminations. The material is preferred for certain applications with relatively high dielectric
- Precompressed pressboard is laminated ,even fibre orientation, hard and dimensionally
- High purity and mechanical strength
- Low shrinkage and compressibility
- Good compatibility with liquid dielectrics
- Insulation class A (105° C) in accordance with VDE 0530 Part 1
- As support between the winding and the yoke e.g:
- Pressure plates
- Pressure rings
- General spacer material in the yoke insulation
- Winding support blocks
- As support for cleats and leads
- Available in thickness of 10mm – 120mm
- Available in widths of 3100 X 2050 or 2000 X 1000mm
CALMICA-FLEX ® SI 2726
CALMICA-FLEX ® SI 2726 consists of mica paper with aramide fibres impregnated with silicone resin and a glass cloth as carrier. The insulation with with CALMICA-FLEX ® SI 2726 shows good taping properties and very high thermal stability. It remains flexible after heat treatment. CALMICA-FLEX ® SI 2726 is compatible with solvent free silicon impregnating resins.
CALMICA-FLEX ® SI 2726 is used e.g. for endwinding insulation in high voltage machines of thermal class 180 (H). For copper strand conductor and main insulation of rotor windings CALMICA-FLEX ® SI 2726 is used as well as for pole coils and connections in traction motors up to thermal class 200 (C). CALMICA-FLEX ® SI 2726 can be processed with or without an impregnation process with silicone resin
Format Rolls maximum width 1000 mm Tapes from 10 mm width upward
Minimum 12 months at 20 °C
Minimum 24 months at 5 °C