Rubber Uses / Chemical resistant / Physical property temperature

Introduction of rubber

Rubber is a product made of high molecular weight polymer, that can be extended to lengh over two times of its size and rapidly return to its original condition. Roughly it may be divided into natural and synthetic rubbers. Among the above-mentioned tables of phifical properties,NR is the only natural rubber, while the others are all synthetic ones. To increase physical property of rubber, formulas are all added with various rubber additives to make products meet environmental requirements, to decrease proportion of rubber, costs, and increase convenience in production.

Uses of Rubbers

Abbr.

Uses

EPDM:

Equipped with excellent properties of weather resistance, oxidation resistance, acute solvent resistance, high temperature resistance. Most applied to window strips, wiper blades as auto parts, gaskets, flooring material, and roofing material.

NBR:

Grease resistanct rubber, of which grease resistance levels depend on content of acrylonitrile. Excellent in thermal resistance and wear resistance. Most applied to grease resistant packing, o-ring, contact rollers, oil resistant pipe, and so on. HNBR comes with higher thermal resistance, and wear resistance.

MQ:

Silicone available in liquid and solid state, suitable for wide range of temperature, excellent in weather resistance, odorless and tasteless, commonly applied to medical equipment and auto parts as packings.

IR:

Belonging to artificial rubber available in cis-trans states. Unlike natural rubber that is easy for crystallization, and not as excellent as natural rubber in physical property, but it can mix and match the natural one.

SBR:

Similar to natural rubber, but it takes longer time to vulcanize. May mix with NR, IR, BR, and may replace most natural rubber products.

BR:

Having great ability to cold resistant, hard to process than NR and SBR, but may mix with NR, IR, or BR in uses to increase physical characteristics and manufactures.

IIR:

Very low in breathability. Excellent in polar solvent, heat, and drug resistant, but bad in workability, hard to vulcanize, and hard to mix with NR, or NBR. BIIR and CIIR come with better workability and miscibility.

CR:

A synthetic rubber with balance in physical properties, in resistant to drug, heat, temperature, low burning, and oil; suitable for adhesives, tubes, or gaskets among others.

CSM:

Common name of hyperion, the synthetic rubber resistant to O3, heat, temperature, oil or chemicals is applied to fireproof materials, heat-proof rubber products and insulated rubber products.

ACM:

Acrylic rubber, high temperature, heat and O3 resistant, may replace FKM

FKM:

Resistant to chemicals, oil, solvents, and temperature. Widely used in rigid environments of high temperature, chemicals or oil such as O rings and packings.

NR:

The only natural rubber with features of excellent elasticity, anti-friction, and tensile strength; almost 100% close to natural rubber, it is an unsaturated elastomer short of ability of anti-oxidation or anti-O3 that needs addition of anti-aging agent and antioxidants. Mostly applied to tires, shock absorber gaskets, soles, and wheels among others.


Chemical resistantce of rubber

abbr. name

NR

IR

SBR

BR

NBR

EPDM

IIR

CR

CSM

ACM

MQ

FKM

rubber types

natural rubber

isoprene rubber

styrene butadie

polybutadiene

NBR

EPR

HR

CR

CSM

ACM

MQ

FKM

chem-resis

repellant elasticity

○X

△X

△X

△X

△X

ozone resistance

X

X

X

X

X

MEK resistance

X

X

X

X

X

X

X

X

 mineral oil resisrance

X

X

X

X

X

X

Sulfuric acidresistance

X

X

toluene resistant

X

X

X

X

X

X

X

X

X

X

X

alcohol resistantt

X

X

Ether resistant

X

X

X

X

X

X

X

X

X

olive oil resistant

X

X

X

X

MEK resistant

X

X

X

X

X

X

◎excellent  ○good   △ordinary  Xbad


Physical property of rubber

abbr.name

NR

IR

SBR

BR

NBR

EPDM

IIR

CR

CSM

ACM

MQ

FKM

rubber types

 Natural rubber

isoprene rubber

styrene butadiene

polybutadiene

NBR

EPR

butyl

chloreprene

CSM

Acrylic rubber

silicone rubber

fluoro-chlorine rubber

P.P. of rubber

proportion

0.91

0.91

0.93

0.9

0.98

0.87

0.92

1.23

1.18

1.13

0.98

1.82

Tg(。C)

-75

-75

-55

-85

-40

-55

-65

-50

-50

-30

-110

-30

 (。C)Max temp

70

70

70

70

100

125

100

100

125

150

225

250

hardness(shore A)

30~90

30~90

40~90

40~80

40~90

40~90

40~80

40~90

40~90

60~90

40~80

55~90

max tensile strength(kgf/cm 2 )

35

30

25

20

25

20

20

25

30

20

15

20

%max elongation force

800

800

800

800

700

500

800

800

500

350

400

300


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