SynFlex Group:
Please tell us
Winding wire

SHTherm® 220 Flat

  • Enamelled flat copper wire, thermoresistant
  • Insulated with polyamide-imide
  • Class 220

SHTherm® 220 Flat is a highly thermoresistant enamelled copper wire of heat performance class R with superior thermal, chemical and mechanical resistance. It is used for special applications requiring the following criteria:

  •  very high permanent thermal resistance and short-time thermal overload
  • very good resistance to aggressive mediums in liquid or gas form

SHTherm® 220 Flat is ideally suited for use in special safety-relevant and electrical life support equipment. Sophisticated process technology and process setting ensure easy mouldability, good elongation and constant insulation properties of these wires.


E-Mobility, hybrid constructions


IEC / DIN EN 60317-58

Delivery forms

Grade 1: on request
Grade 2: on request

Technical data

Typical properties of enamelled flat copper wire 5.60 x 3.55 mm, with insulation film grade 2

Width with varnish  Bare wire width  Thickness with varnish  Bare wire thickness  Varnish increase  Adhesion (no cracks in film after winding)  Bend over width  Bend over thickness  Elongation  Pencil hardness  Elongation at break 
Unit of measure Set value  Actual value (typ.) 
mm  5.67 - 5.82 as set value
mm  5.550-5.650 as set value
mm  3.62 - 3.77 as set value
mm  3.500-3.600 as set value
μm  120 - 170 as set value
  mandrel diameter  
  4 x width 3 x width
  4 x thickness 3 x thickness
  15 % with cracks < 1 x width 32 % without cracks
  H 4H - 5H
≥ 32 ≥ 38
Temperature index TI  Heat shock at 240 °C (no cracks in varnish coat after winding)  Solderability 
Unit of measure Set value  Actual value (typ.) 
°C  220 220
  mandrel diameter 6 x thickness mandrel diameter 4 x thickness
  no no
Dielectrical strength at RT  High voltage discontiniuties test voltage 2,5 kV  Electrical conductivity 
Unit of measure Set value  Actual value (typ.) 
kV  ≥ 2.0 (ball pit) ≥ 3 (ball pit)
  / ≤ 7 on 100 m
MS/m  58 - 59 ≥ 58.5
Pencil hardness (storage in standard solvent ½ h / 60 °C)  Pencil hardness (storage in alcohol ½ h / 60 °C)  Resistance to commercial impregnants^(1)  Resistance to commercial refrigerants^(1)  Resistance to commercial dry transformer oils^(1)  Resistance to commercial hydraulic oils^(1) 
Set value  Actual value (typ.) 
min. H 3H - 5H
min. H 3H - 5H
/ yes
/ yes
/ yes
/ yes

(1) Due to the variety of individual applications we cannot make any generally binding commitments regarding the compatibility. We recommend testing compatibility with the materials being used.