Insulating papers and films

Pure cellulose kraft paper, calendered for electrical use, finished on both sides with a heat-curing epoxy, pre-impregnated in the B stage.

The geometry and distribution of the diamonds cover about 36% of the surface, leaving the remaining 64% free for optimum oil impregnation after the appropriate temperature cycle over the recommended time.
The prepreg resin cross-links as it passes from the B stage (prepreg) to the C stage (polymerised), bonding firmly to itself or to the metal parts it touches and creating micro-channels for optimum oil circulation.

Insulation from 105° to 130 °C – class A–B

CLASS A Operating temperature

105° in continuous service

A flexible insulating paper made by hot-bonding a polyester film of variable thickness to a 50-micron layer of non-woven polyester, firmly bonded to the film surface with special resins to increase its resistance to thermal ageing.
The class H saturating resin gives the composite class F (155°) insulation characteristics.

APPLICATIONS

A laminate suitable for insulating class B/F electric motors and transformers.
Class F Operating temperature 155° in continuous service.

A flexible insulating paper made by hot-bonding a polyester film of various thicknesses to a 50-micron layer of non-woven polyester, firmly bonded to one side of the film with special resins to increase its resistance to thermal ageing.

APPLICATIONS

A laminate suitable for insulating class B/F electric motors and transformers

Class B/F Operating temperature

130° in continuous service

DESCRIPTION

A flexible insulating paper made by hot-bonding a polyester film to two 50-micron layers of non-woven polyester, firmly attached to both sides of the film with special resins. The non-woven polyester is then impregnated with synthetic resins to increase the polyester film's resistance to thermal ageing.
The class H saturating resin gives the composite class F (155°) insulation characteristics according to A.S.T.M. D-1830.

Melting point

260 °C

APPLICATIONS

A laminate suitable for insulating class F electric motors and transformers.

Class F

Operating temperature: 155 °C in continuous service

DESCRIPTION

A flexible insulating paper made by hot-bonding a polyester film to two 50-micron layers of non-woven polyester, firmly bonded to both sides of the film with special resins to increase resistance to thermal ageing. The surface of the DMD composite can be further impregnated to saturation, which raises its heat resistance to class F (155 °C).

Operating temperature

Class B 130° in continuous service
Class B/F 130/155 °C

Melting point

260 °C

Shrinkage at 150 °C

APPLICATIONS

A laminate suitable for insulating electric motors and transformers – class B/F

Class B/F Operating temperature

130° in continuous service

APPLICATIONS

Used throughout the electrical industry, especially in building low-voltage motors and transformers. Mainly used in insulating slots. It has good dielectric strength and mechanical strength, and good thermal resistance in continuous service.
It can be twisted and bent.

CLASS A Operating temperature

105° in continuous service

Insulation made by laminating a layer of polyester film of variable thickness between two layers of 50-micron kraft paper.
The outer kraft-paper lamination protects the film from oxidation and gives good adhesion to impregnating resins.

CLASS B Operating temperature 130° in continuous service

DESCRIPTION

Latheroid Polyester laminate is a flexible insulating material made by hot-bonding a layer of pure cellulose paper, specially treated for electrical use, with a polyester film.

CHARACTERISTICS

Very resistant to tension and tearing, high dielectric strength, good dimensional stability, compatible with impregnating varnishes and mineral oils. Good heat resistance.

COLOUR

Green-grey.

APPLICATIONS

A film suitable for insulating class B electric motors and transformers.
Insulation up to 130 °C – class B EN 60626-3 sheet 100-102-112 (F-PET/P-C two layers). (P-C/F-PET/P-C three layers)
CLASS B Operating temperature 130° in continuous service

A material based on polyethylene terephthalate in the form of a flexible, transparent film.

CLASS B Operating temperature

130° in continuous service

Mylar® A is a trademark registered by DuPont

DESCRIPTION

A flexible insulating paper made by hot-bonding a polyester film and a 50-micron layer of Nomex® aramid paper, firmly bonded to the film with special resins with class H heat resistance.

CHARACTERISTICS

Excellent resistance to chemical products and impregnating resins; very resistant to tearing and puncture.

APPLICATIONS

A laminate suitable for insulating electric motors and transformers – class F
Nomex® is a trademark registered by DuPont de Nemours
Class F Operating temperature 155° in continuous service

DESCRIPTION

A flexible insulating paper made by hot-bonding one layer of polyester film to two layers of 50-micron Nomex® aramid paper, firmly bonded to both sides of the film with special resins.

CHARACTERISTICS

Excellent resistance to chemical products and impregnating resins, very resistant to tearing and splitting, excellent for use on automatic machines.

APPLICATIONS

A laminate suitable for insulating electric motors and transformers – class H.
Nomex® is a trademark registered by DuPont de Nemours
Class H Operating temperature 180° in continuous service

Nomex® type 410 is a calendered paper for electrical insulation that offers a high dielectric constant, mechanical strength, flexibility and toughness.

Nomex® type 410 is widely used in most applications involving class H electrical equipment.

Flammability

to UL 94 V0

Insulation up to 200 °C – class H

Class H Operating temperature

180° in continuous service

The polyester film is transparent or milky, flexible and very resistant to tensile forces, tearing and impact. It is inert and impermeable to oils, greases and volatile aromatic compounds. It contains no allergens or plasticisers and does not degrade over time under normal conditions. It has high electrical insulating properties. It keeps all its best properties – staying tough, flexible and highly insulating – at temperatures between -70° and +150 °C, and is used for a wide range of industrial purposes, for example:

Electrical insulation for motors, generators, transformers, coils, cables and conductors;
Thermal and physical barriers;
Release agent;
Membrane switches;
Support material for laminating and bonding with others to obtain composites with different characteristics.

In thicknesses from 50 to 350 microns it can be formed, thermoformed and moulded. In thinner gauges it is spirally wound around tubes, laminates etc.

Using polyester film makes it possible to

Reduce the volume and weight of equipment;
Raise the level of electrical insulation;
Raise the operating temperature;
Improve the planning and automation of production cycles;
Replace thicker insulating materials.
The original certified polyester film is approved to US UL standards and international IEC/CEI standards.

PROPERTIES

Operating temperature

-70 °C to 165 °C

Melting point

165–250 °C

Shrinkage at 150 °C

2%–3%

Dielectric strength at 25 °C

280 kV/mm.

Dielectric strength at 150 °C

200 kV/mm

Class B Operating temperature

130 °C in continuous service

COMPOSITION

ELEKTRON is a pressed and smoothed insulating board of low porosity, natural brown in colour, made from pure cellulose sulphate;
Compatible with the following international standards: DIN 7733: Psp 3040

APPLICATIONS

Used throughout the electrical industry, and especially in making low-voltage motors and transformers. Mainly used in insulating slots. It has good dielectric and mechanical strength, and good heat resistance in continuous service.
It can be twisted and bent.

Class A Operating temperature

105° in continuous service