Taping

Taped high frequency litz wire constructions are mainly suitable for applications requiring a high break down voltage. Taping gives litz wire improved capability to withstand flexing and mechanical stress. Self-adhesive tape material increases protection against re-opening during and after manufacturing processes and thus secures the compliance with defined creepage distance. 

Some tapes can be thermally sealed, when used in conjunction with certain wire enamel types.

The individual wires excellent adhesion and bonding characteristics can be achieved. Thermally sealed tapes can be selected from a number of material types for special applications all promoting various degress of flexibility and mechanical protection for the litz wire construction.

Features and Benefits of Tapes
 Variants

Dielectric strength

   Flexibility        Splicing         Contacting   
Standardhighvery goodgoodvery good
Thermally Sealedelevatedmediumvery goodvery good
Self-Adhesivevery highgoodvery goodgood

 

 

 

Dimensions

 

Applications

 Content                   • Inverters
Diameter of single wires0.040-0.500mm           • RF transformers
Outer diameter of litz wire0.50-10.0mm• RF transducers
Overlapping single tape50 or 67%• RF chokes
Numbers of tapes (max.)2• Inductive charging

 

 

Technical Data Sheet of Tapes

PETPENPI
DescriptionPolyesterPolyethylene NaphthalatPolymide
Colourtransparenttransparentbrown
StandardPETPENPI
Breakdown volltagekV

5.0

(VDE 0345)

>5.0

(JIS C 2318)

5.0

(ASTM D 149)

Insulation class (UL)°C105 (A)180 (H)200 (C)
Insulation class (VDE)°C130 (B)-200 (C)
Dielectric constantεr

3.3

(VDE 0345)

2.9

(JIS C 2318)

3.4

(ASTM D 150-92)

Flammability°C

400

(VDE 0345)

V-0

(IEC 60695-11-10; UL94)

UL-File No. Tapes*E53895E206562E39505
Processingfusiblefusiblemachanical stripping
Thermally SealedPETPENPI
Breakdown voltagekV

5.4

(ASTM D 149-81)

-

5.0

(ASTM D 149)

Insulation class (UL)°C105 (A)-200 (C)
Insulation class (VDE)°C130 (B)-200 (C)
Dielectric constantεr

3.26

(ASTM D 150-81)

-

3.4

(ASTM D 150-92)

Flammabilityn.a.-

V-0

(IEC 60695-11-10; UL94)

UL-File No. Tapes*E93687-E39505
Processingfusible-mechanical stripping
Self-AdhesivePETPENPI
Breakdown voltage1kV5.05.05.0
Insulation class (UL)°C130 (B)180 (H)180 (H)
Dielectric constantεr

3.2

(JIS C 2318)

2.9

(JIS C 2318)

3.3

(JIS C 2318)

Flammability-

flame retardant

(UL 501)

flame retardant

(UL 501)

UL-File No. Tapes*E93687E206562E39505
Processingfusiblefusiblemechanical stripping

 

 

1 approximate value

* the used foils are variants of UL recognized products

  Other materials on demand

 

Special constructions with VDE-approval for high voltage applications available:

EFOLIT-product family

VDE - certified acc.:DIN EN 60950, annex U
DIN EN 61558, annex K
DIN EN 60601, annex L