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Designation

Suralac® 1000

Suralac® 3000

Suralac® 5000

Suralac® 7000

Type

Organic

Organic with fillers

Semi-organic

Inorganic

Description

Organic synthetic resin

Organic synthetic resin with inorganic fillers

Organic resin with phosphates and sulphates

Inorganic phosphate Inorganic fillers and some organic resin

Class acc. IEC 60404-1-1

EC-3

EC-6

EC-5-P

EC-5-N / EC-5-AS

Class acc. ASTM A976-97

C-3

C-6

  –

C-4 / C-5 1)

Thickness range, per side

0.7 - 6 μm

3.5 - 6 μm

0.7 - 1.2 μm

0.7 - 3.5 μm

Standard thickness

2.5 μm

6 μm

1.2 μm

1.5 μm

Colour

Clear to brown

Grey

Brown to grey

Grey

Temperature capability:

 

 

 

 

in air (continuous)

180ºC

180ºC

200ºC

270ºC

Temperature capability:

 

 

 

 

in inert gas (intermittent)

450ºC

500ºC

500ºC

850ºC

Withstands:

 

 

 

 

Stress relief annealing 2)

YES

Burn-out repair

YES

YES

Aluminium casting

YES

YES

YES

YES

Chemical resistance:

 

 

 

 

Stamping lubricants 3)

YES

YES

YES

YES

Transformer oils

YES

YES

YES

YES

Freon

YES

YES

YES

YES

Typical pencil hardness

8 - 9 H

8 - 9 H

8 - 9 H

9 H

Typical thickness:

 

 

 

 

μm per side

0.7

2.5

6

3.5

6

0.7

1.2

0.7

1.5

3.5

Typical welding 4)

good

spec

spec

spec

spec

exc

exc

exc

good

mod

Typical punching 4)

exc

exc

good

good

mod

good

exc

good

good

mod

Surface insulation resistance:

 

 

 

 

 

 

 

 

 

 

(Franklin ASTM A717):

 

 

 

 

 

 

 

 

 

 

Typical value, Ω-cm2 per lamination

10

50

>2000

>2000

>2000

3

7

20

40

>2000

Typical value, Ampere A per lamination

0.45

0.1

<0.03

<0.03

<0.03

0.7

0.4

0.25

0.15

<0.03

1) Suralac® 7000 is classified as a C-5 coating, but can be used as a C-4 coating

2) Stress relief annealing in inert or preferably slightly oxidizing atmosphere

3) Testing involves all lubricants used by our present customers. New lubricants may need special consideration

4) exc = excellent, good = good, mod = moderate, spec = special precautions/techniques needed.

All coatings have excellent adhesion and will withstand normal punching operations. Cogent Power's coatings provide some corrosion resistance and have only a marginal effect on stacking factor.

The schematic diagrams below provide guidance on the different types of coatings and their performance in application.