Insulation class F up to 155 °C

Insulation class F up to 155 °C

Insulation class F

Class F insulation material consists of materials or combinations of materials such as mica, fiberglass, etc. with suitable binders, impregnating or coating materials and other materials or combinations of materials, not necessarily inorganic, which experience or testing has shown to be capable of operating at Class F temperatures (materials with a Degree of thermal stability that allows them to operate at a temperature 25 degrees higher than class B materials).

Maximum allowable temperature: (IEC60034-1 & NEMA MG1-12.43): 155°C, 311°F.

Class F materials

In the area of ​​insulation class F, we focus on 2 materials:

  1. DMD laminate
  2. NMN laminate

DMD laminate : Insulation class F

DMD is a 3-layer laminate consisting of polyester fleece - polyester film - Polyester fleece, whereby the polyester fleece is optionally additionally impregnated or coated in order to be able to achieve a higher warmth class.

DMD is therefore available in heat classes B and F depending on the manufacturer and impregnation. If the material is uncoated we only sell it as Grade B.

DMD has high mechanical stability and high dielectric strength at the same time. Its smooth surface makes it easy to machine and easy to pull into the rotor or stator.

Thanks to the special outer layer made of fleece, DMD laminates form a very good bond with impregnating and trickling resins. This is the prerequisite for a permanently stable insulation system. Depending on the structure of the laminate, ie the individual material thicknesses of fleece and polyester film, DMD has different total thicknesses of 0,09 to 1,20 mm.

We also use this laminate for the manufacture of stampingsn as well as moldings such as slot insulation and  deck sliders . The DMD is also delivered feathered.

NMN laminate : a Class F laminate

NMN is a laminate consisting of 3 layers: 1st layer Nomex, 2nd layer polyester film, 3rd layer Nomex. For standard NMN laminates, calendered Nomex® aramid paper type 464 or 416 is used. With NMN laminates, the good mechanical and electrical properties of the polyester films are ideally complemented by the excellent thermal properties of the Nomex® aramid paper. We offer three main types of NMN laminates:

NMN 5 - Nomex layer: 50 µm
NMN 8 - Nomex layer: 80 µm
NMN 13 - Nomex layer: 130 µm

Depending on the thickness of the polyester film and the insulating paper, the total thickness is between 0,12 and 0,82 mm. Special laminates for slot insulation are also manufactured in larger thicknesses.

NMN laminates are often used as insulation material in electric motor construction. The combination of the extremely heat-resistant Nomex paper and the dimensionally stable polyester film is ideal for use as slot insulation, phase insulation, stamped parts or slot seals.

NMN laminates are also available in the Nomex® 411 version, ie as a 3-layer laminate with uncalendered Nomex® 411 aramid paper. This material is then used as phase insulation.

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