Comparative Properties of Natural ＆ Various Synthetic Rubbers

PROPERTIES

NATURAL
RUBBER

Nitrile

ADIPRENE
polyurethane

HYPALON
choro-sulfonated
polyuthyiene

NORDEL
ethylene-propylene-
diene polymer

NEOPRENE
chloroprene

Silicone

VITON
co-polymer of vinylidene
fluoride and hexafluoro-propylene

HARDNESS RANGE
(durometere A &D)

30 - 90 A

30 - 90 A

60.99 + A
(up to 80 D)

40 - 95 A

40 - 90 A

40 - 95 A

30 - 85 A

60 - 95 A

TENSILE STRENGTH
(psi) -  pure gum

Over 3000

Over 2000 psi

Over 4000

Over 2500

---

Over 3000

Over 500 psi

Over 2000

Black loaded stocks

Over 3000

Over 3000 psi

---

Over 3000

Over 3000

Over 3000

Over 1400 psi

Over 2000

SPECIFIC GRAVITY
- (Base Material)

0.93

0.98

1.06

1.12 - 1.28

0.86

1.23

-

1.85

VULCANIZING PROPERTIES

Excellent

Excellent

Excellent

Excellent

Excellent

Excellent

Excellent

Good

ADHESION TO METALS

Excellent

Excellent

Excellent

Excellent

Good to Excellent

Excellent

Poor

Good to Excellent

ADHESION TO FABRICS

Excellent

Excellent

Excellent

Good

Good

Excellent

Poor

Good toExcellent

TEAR RESISTANCE

Good

Excellent

Excellent

Fair

Good

Good

Poor

Fair

ABRASION RESISTANCE

Excellent

Excellent

Outstanding

Excellent

Excellent

Excellent

Poor

Good

COMPRESSION SET

Good

Good

Fair

Fair

Good

Fair to Good

Good

Fair to Good

REBOUND
-  Cold

Excellent

Good

Poor to V.L.Temp

Good

Very Good

Very Good

Fair to Good

Good

-  Hot

Excellent

Good

Good at R.T.

Good

Very Good

Very Good

Fair to Good

Excellent

DIELECTRIC STRENGTH

Excellent

Fair to Good

Excellent

Excellent

Excellent

Good

Excellent

Good

ELECTRICAL INSULATION

Good to Excellent

Fair to Good

Fair to Good

Good

Excellent

Fair to Good

Excellent

Fair to Good

PERMEABILITY TO GASES

Fair

Excellent

Fair

Low to V.L.

Fair

Low

Poor

Very low

ACID RESISTANCE-  Dilute

Fair to Good

Good

Fair

Excellent

Excellent

Excellent

Good

Excellent

Concentrated

Fair to Good

Fair to Good

Poor

Very Good

Excellent

Good

Good

Excellent

SOLVENT RESISTANCE
-Aliphatic hydrocarbons

Poor

Good

Excellent

Good

Poor

Good

Good

Excellent

Aromatic hydrocarbons

Poor

Excellent

Fair to Good

Fair

Poor

Fair

Good

Excellent

-Oxygenated (Ketones, etc.)

Fair to Good

Poor

Poor

Poor

Good

Poor

Good

Poor

- Lacquer solvents

Poor

Good

Poor

Poor

Poor

Poor

Good

Poor

RESISTANCE TO :
Swelling in lubricating oil

Poor

Good

Excellent

Good to Excellent

Poor

Good

Good

Excellent

Oil and gasoline

Poor

Very Good

Excellent

Good

Poor

Good

Good

Excellent

Animal and Vegetable oils

Poor to Good

Poor

Excellent

Good

Good

Good

Good

Excellent

Water absorption

Very Good

Good

Good at R.T. Poor at 212^oF^.

Very Good 

Very Good

Good

Excellent

Very Good

Oxidation

Good

Good

Excellent

Excellent

Excellent

Excellent

Excellent

Outstanding

Ozone

Fair

Good

Excellent

Outstanding

Outstanding

Excellent

Outstanding

Outstanding

Sunlight aging

Poor

Good

Good

Outstanding

Outstanding

Very Good

Outstanding

Very Good

Heat aging

Good

Good

Good

Excellent

Excellent

Excellent

Outstanding

Outstanding

Flame **

Poor

Poor to Good

Fair (Will melt)

Good

Poor

Very Good

Poor

Excellent

Heat

Good

Good

Good

Excellent

Excellent

Very Good

Excellent

Outstanding

Cold

Excellent

Fair to Good

Excellent

Good

Excellent

Good

Excellent

Good