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Rubber Compounds
Figure 1.4 Rubber Compound Specifications - To Be Regarded Only As A Guide

Commercial name

 

APTK

 

Polyurethane

Silicone

SBR

 

Epichloro- hydrin rubber

EPDM
Ethylene- propylenediene rubber

Fluorinated rubber

Polyboron rubber

Polyurethane

Silicone
rubber

Styrenebutadiene rubber

 

Low gas permeability, very good low temperature properties, good resistance to mineral oils, ozone and high temperatures.

Versatile in use, very good flexibility, resistant to abrasion, resistant to wear and tear, resistant to ozone and weather, resistant to low temperatures. Can be used to protect against washing and spraying agents, excellent for profile cords not usable in conjunction with petrol, solvents and mineral oils.

Hexafluoropropylene vinylidene fluoride copolymer. Resistant to extreme temperatures even over 200°C. Very good mechanical properties and high resistance to tearing even at high temperatures. Excellent for exposure to sunlight, ozone and weather. Not recommended for use in conjunction with esters and ketones.

High mechanical strength, medium resistance to oil, good resistance to ozone. Flexibility and damping properties can be varied as required, excellent resistance to water, slight permanent set.

Excellent resistance to wear and tear, best flexibility with high shore hardness of all the elastomers, good resistance to oil, not resistant to hydrolysis.

Resistant to high temperatures, odourless and tasteless, non-toxic, can be sterilised in accordance with foodstuffs regulations. Resistant to sea water and corrosive salt solutions, not to be used in conjunction with steam, concentrated acids and alkali, swells strongly under the effect of aromatic solvents.

Similar to natural rubber, resistant to abrasion, rubbing in, good resistance to high temperatures and cracking, resistance to extreme low temperatures, not resistant to petrol, benzene, greases and oils.

International
designation

ECO

EPDM/EPM

FPM

PNR

PUR

MVQ/SI

SBR

Hardness available

50 - 90 Shore A

30 -90 Shore A

65 - 90 Shore A

10 - 80 Shore A

55 - 98 Shore A

40 - 80 Shore A

35 - 95 Shore A

Temperature resistance

-40°C to 130°C

-40°C to 150°C

-30°C to 225°C

-40°C to 80°C

-30°C to 80°C

-70°C to 180°C

-30°C to 110°C

Short-time peak temp

150°C

180°C

350°C

100°C

100°C

225°C

150°C

Tensile Strength (N/mm2)

17

20

20

17

30

8

25

Tensile elongation (%)

150 to 500

450

400

300 to 700

800

250

450

Properties

             

Abrasion

moderate

good

moderate

good

excellent

moderate

very good

Resistance to flex cracking

good

very good

good

moderate

-

bad

good

Elongation/Tensile strength

good

good

good

good

excellent

bad

good

Flexibility

moderate

good

moderate

as required

good

good

good

Notch strength /
strength of structure

good

moderate

almost good

moderate

excellent

moderate

good

Resistance to light

good

excellent

excellent

good

good

excellent

moderate

Resistance to oxidising

good

excellent

excellent

good

good

very good

moderate

Resistance to ozone

very good

excellent

excellent

good

good

excellent

moderate

Resistance to wear/tear

-

good

almost good

good

excellent

bad

very good

Weathering effect

good

excellent

excellent

good

moderate

excellent

good

Resistance to

             

Lyes

bad

excellent

very good

moderate

not suitable

not suitable

good

Petrol

good

not suitable

excellent

not suitable

very good

not suitable

not suitable

Benzole

good

not suitable

good

not suitable

not suitable

not suitable

not suitable

Foodstuffs

not suitable

suitable

not suitable

not suitable

not suitable

excellent

suitable

Solvents, aliphatic

good

bad

very good

not suitable

very good

not suitable

not suitable

Solvents, aromatic

good

not suitable

good

not suitable

moderate

not suitable

not suitable

Solvents, halogen

not suitable

not suitable

good

not suitable

bad

not suitable

not suitable

Oils and greases

very good

bad

good

conditional

very good

good

not suitable

Acids

moderate

very good

very good

moderate

not suitable

not suitable

conditional

Water

moderate

very good

good

excellent

not suitable

good

very good

It is not possible to undertake any warranty for the stated properties as practical use is subject to temperature, concentration etc...

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