Properties Of Insulation Materials

 Material

Abv.

VDE symbol

Cenelec symbol

Dielectric index (800Hz)

Breakdown voltage KV/mm

Radiation resist- cJ/kg (= rad)

Polyvinylchloride

PVC

Y

V

4.0

10

8•10⁷

Polyvinylchloride heat resistant

PVC

Y

V2

3.5

20

1•10⁸

Polyethylene LD

LDPE

2Y

E

2.3

75

1•10⁷

Polyethylene HD

HDPE

2Y

E2

2.3

100

7•10⁶

Polystyrene

PS

3Y

Q3

2.5

30

5•10⁶

Polyamide

PA

4Y

Q4

4.0

25

1•10⁷

Polytetraflouroethylene

PTFE

5Y

E4

2.1

25

1•10⁵

Flourine-Ethylene-Propylene

FEP

6Y

2.1

20

3•10⁵

Ethylenetetraflouroethylene

ETFE

7Y

E6

2.6

30

1•10⁷

Polypropylene

PP

9Y

E7

2.3

35

1•10⁵

Polyurethane

PUR

11Y

Q

6

20

5•10⁷

Polyethylene-Terephtalate

PETP

12Y

Q2

3.3

30

1•10⁷

Natural Rubber

NR

G

R

4

20

8•10⁷

Styrene-Rubber

SBR

G

R

4

20

2•10⁷

Silicone-Rubber

SIR

2G

S

3.2

20

2•10⁷

Ethylene-Propylene-Rubber

EPR/EPDM

3G

B

3.5

20

1•10⁸

Ethylene-Vinyl-Acetate

EVA

4G

G

5

30

1•10⁷

Polychloroprene

CR

5G

N

8

20

2•10⁷

Cross-linked Polyethylene

VPE

2X

X

2.4

50

1•10⁷

 Material

Abv.

Dens. g/cm³

Flex

Tensile Strength N/mm²

Breaking Elong. %

Water Absorp. %

Water Vapor Perm.

Weather Resist.

Flam

Polyvinylchloride

PVC

1.35

+

15

250

0.4

o

+

s.v.

Polyvinylchloride heat resistant

PVC

1.35

+

18

200

0.4

o

+

s.v.

Polyethylene LD

LDPE

0.9

o

10

400

0.03

-

+

e.

Polyethylene HD

HDPE

0.9

-

20

500

0.03

-

+

e.

Polystyrene

PS

1.06

o

55

30

1

-

+

e.

Polyamide

PA

1.1

o

50

200

2

o

+

s.v.

Polytetraflouroethylene

PTFE

2.17

-

40

350

0.01

—

++

n.e.

Flourine-Ethylene-Propylene

FEP

2.15

20

250

0.01

—

++

n.e.

Ethylenetetraflouroethylene

ETFE

1.70

o

45

200

0.01

—

++

n.e.

Polypropylene

PP

0.91

o

30

500

0.1

-

+

e.

Polyurethane

PUR

1.20

+

30

400

5

-

++

s.v.

Polyethylene-Terephtalate

PETP

1.40

-

100

50

0.3

-

+

n.e.

Natural Rubber

NR

1.6

++

10

350

0.1

-

+

e.

Styrene-Rubber

SBR

1.6

++

5

250

0.1

-

+

e.

Silicone-Rubber

SIR

1.25

++

5

200

1

—

+

s.e.

Ethylene-Propylene-Rubber

EPR/EPDM

1.45

++

5

200

0.2

-

+

e.

Ethylene-Vinyl-Acetate

EVA

1.40

++

6

300

0.1

o

+

e.

Polychloroprene

CR

1.55

+

15

300

1

o

++

s.v.

Cross-linked Polyethylene

VPE

0.92

o

22

300

0.03

-

+

e.

Key to symbols:

++

very good

n.e.

non-flammable

+

good

s.e.

flame-retardent

o

average

s.v.

self-extinguishing

-

low

e.

flammable

—

very low