Electro-insulating materials play a fundamental role in terms of reliability of electric devices.
Nitto DENKO, the pioneer of the sector where it has worked since 1918, continues to utilize its wide experience to meet the strict regulations of the electric market. Today Nitto offers a wide range of supporting materials, as pure plasticized PVC, PTFE or laminates combined with bonding system made in-house that include rubber-based, acrylic-based and silicone-based bonds.
The complex combination between support and bond give Nitto tapes important performances, as flame-retardant features, resistance to high temperature or high dielectric strength.

Advantages
A wide range of electric bonding tapes sensitive to pressure was developed by Nitto DENKO to block, reinforce, protect and insulate the magnet conductors of electric and electronic components, devices and equipment. The accurate choice of substrates of bonding systems ensures a low-corrosion structure that acts in a reliable way in particular project conditions. Nitto DENKO products can be immediately used when received. To achieve the best performance, however, many of these tapes can be subject to thermo-hardening after the application with the following advantages:

• Higher bonding strength
  The thermo-hardening action improves the bonding seal to the substrates and the application surfaces, without leaving aside the bond flexibility.
• Improvement of the resistance to solvents
  The molecular alteration of the bond during the thermo-hardening phase grows substantially its resistance to the solvents contained by impregnating paints, insulating mixes and degreasing products.
• Higher resistance to temperatures
  The thermo-hardened bond resists to the later softening and to chemical wear and tear thanks to the continuous heat stresses. Electric performances do not change.

RUBBER
Natural and synthetic elastomers are accurately selected, combined with resins sensitive to pressure ensure an electrolytic non-corrosive base. After thermo-hardening the rubber-based systems can resist to constant operating temperatures up to 130° C, depending on the substrate used.

NON-THERMO HARDENING
It is equal to the abovementioned rubber-based bond but it is free from reticulating resins.

SEMI-TREATED
These are rubber-based systems that were submitted to partial treatment during the tape production phase. Resistance to solvents and winding stability are improved. It can be further treated to optimize the resistance to solvents and bonding. It resists to constant high temperatures up to 130° C.

ACRYLIC
System based on synthetic resin/elastomer able to resist at operating temperatures up to 155°C.
Initial pre-hardening gives good resistance to solvents that can be improved by means of a further treatment during the application.

THERMOPLASTIC
The same of the acrylic bond but without reticulating resins.

RESISTANCE TO OILS
Acrylic adhesive created to achieve the highest resistance to mineral oils after thermo-hardening process.

FLAME-RETARDANT ACRYLIC
A system based on intrinsic resistance to solvents, which can be further improved by means of treatment during the application. Modified bond strength, flame-retardant to offer self-extinguishing performances.

SILICONE
Resin/elastomer system recommended for operating temperatures up to 180°C. Generally, it not requires thermo-hardening process, but the resistance to bonding and solvents can be maximized by means of an added after-treatment at high temperature. Unique performances at low and high temperatures. Ideal bond to be used with fireproof supports to achieve flame-retardant tapes.

Treatment times and temperatures are recommended as minimum standard requirement to achieve optimal performances in average conditions. More or less long treatment times can be necessary depending on some factors, like the type of furnace and temperature, component weight, density and structure.

Treatment not always is the necessary premise for a successful application and can be left aside when maximum resistance to solvents and max bonding strength are not required. The user must check the suitability of the tape and make the treatment depending on individual needs and on the specific use conditions.

Product Line

(For more detail on products,
click the different items)

ASTM
The American Association for Tests and Materials – an independent body establishing test methods and standards.

SUPPORT (SUBSTRATO)
Primary component of the tape on which bond is applied. Any continuous material, like fabric, film, treated paper, metal sheet, laminated materials etc.

RESISTANCE TO BACKING
A tape that resists to degradation during the heat treatment of a painted part or of an electric component to which a tape was applied.

MOULDABLE PERFORMANCE
A tape that can be adapted to or establish a full contact with the surface of an uneven-shaped object without crisping or bending.

CORROSION
The electrolytic or chemical deterioration of surface to which the tape is applied.

RETICULATION
A chemical bridge between two molecular chains to improve stiffness and strength at high temperatures.

DIELECTRIC STRENGTH
The tension in volts to which the tape can resist without breaking and without leaving the current passing through.

ELECTROLYTIC CORROSION FACTOR
A measure of the corrosion effect of a tape on a bare copper conductor. It is expressed like a ratio, where 1.0 mans no corrosion during the test and ratios lower than 1.0 mean different level of corrosion.

END SHEAR PEEL TEST
It refers to the condition observed when the end of piece of tape detaches from the object to which it had to be bonded. This word is used in particular for plastic tapes when they detach and in particular for the tape that wrap around its own substrate.

FLAME-RETARDANT PERFORMANCE
The ability of a tape to resist to fire. Combustion velocity, auto-extinguishing performances or removal of the flame, density of smoke, toxic features of fumes and dropping of melted material are important factors for the right assessment of the resistance to flame.

HEAT TREATMENT
The heat application to a tape causes a chemical reaction that creates reticulations increasing the cohesive resistance of the bond and its resistance to high temperatures and solvents.

INSULATION RESISTANCE
The ability of a tape to resist to the current flow along its surface in specific conditions.

RELEASE COATING
This term refers in general to a thin coating that is applied on the backside of a film or other uneven substrate and that enables the tape to be unwound at a monitored level.

RESISTANCE TO SOLVENTS
The resistance of the substrate of a tape or a bond to the melting of an organic solvent – in particular the ones in paints, insulating lacquers and detergents.

BONDING STRENGTH
It refers to the tack level of the bond. It can be measured by means of the rotating sphere. It is expressed as the ratio between the fall height of the sphere and the distance made along a horizontal guided path.

TTHERMO-HARDENING
A word used for elastomers or plastic materials subject to chemical modifications at high temperatures becoming more hard and less plastic or elastic. The thermo-treatment and thermo-hardening are two interchangeable words. Thermo-treated materials sensitive to pressure maintain some elastic features after the treatment.

UNWINDING
The act to remove or unwind a tape from a reel. The unwind features are affected by the bonding strength of the tape to its substrate.

VOLUME RESISTIVITY
It is defined to enable the calculation of the resistance in ohm of pieces of material when the physical sizes are known. The resistivity is specified in units of resistance (ohm) multiplied for the unit of length (generally in cm). The resistivity is expressed by the unit ohm-cm.