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Elastomers Properties

 

   
   

 

 
FABRIC REINFORCED RUBBER (R/C))
 Top

HARDNESS

CODE

NT R/C 80°/85° SHORE 'A'

VT R/C 80°/85° SHORE 'A'

NT36(R/C)

VT3/b(R/C)
 

 

Seals which are subjected to high pressure are impregnated by cotton fabric for improved extrusion resistance. The fabric structure forms micro lubricating pockets, resulting in lower friction values; thus helping to reduce wear. The fabrics are coated with unvulcanised rubber solutions of NBR & FPM depending on the application of the seal.
 
POLYACRLYIC RUBBER (ACM)
 Top

HARDNESS

CODE

ACM 70°/75° SHORE 'A'

ACM 80°/85° SHORE 'A'

ACM 90°/95° SHORE 'A'

PC4/b

PC5/b

PC6/b

 

OPERATING TEMPERATURE:- -10°C to +125°C

The properties of POLYACRYLIC Rubber are midway between nitrile and fluorocarbon rubber. They have excellent resistance to mineral oils, hypoid oils and grease up to 125°C. They are resistant to ageing & flex cracking.

 

ACM is characterised by poor mechanical strength and its resistance to water is poor.
 
STYRENE BUTADIENE RUBBER (SBR)
 Top

HARDNESS

CODE

SBR 70°/75° SHORE 'A'

SBR 80°/85° SHORE 'A'

SBR 90°/95° SHORE 'A'

SB4/b

SB5/b

SB6/b

 

OPERATING TEMPERATURE :- -50°C to +100°C

SBR has good resistance to inorganic and organic acids, as well as alcohols, water and brake fluids based on glycol.

SBR is not resistant to mineral oils, lubricating greases, petroleum, aliphatic, aromatic and chlorinated hydrocarbons.
 
NATURAL RUBBER (NR)
 Top

HARDNESS

CODE

NR 70°/75° SHORE 'A'

NR 80°/85° SHORE 'A'

NR 90°/95° SHORE 'A'

NR5/b

NR6/b

NR7/b

 

OPERATING TEMPERATURE:- -30°C to +80°C

NATURAL Rubber exhibits high mechanical strength and elasticity with very good low temperature characteristics. Because of its high mechanical strength, NR is frequently combined with fabric reinforcement for seals in applications where water is the hydraulic fluid. It has good resistance to acid and bases at low concentrations as well as alcohols.

NR is not resistant to mineral oils and greases, fire resistant hydraulic fluids, aromatic, aliphatic, and chlorinated hydrocarbons
 
BUTYL RUBBER (IIR)
 Top

HARDNESS

CODE

IIR 70°/75° SHORE 'A'

IIR 80°/85° SHORE 'A'

IIR 90°/95° SHORE 'A'

BU4/b

BU5/b

BU6/b

 

OPERATING TEMPERATURE:- -40°C to +120°C

IIR elastomers permeability to gases and water vapour. It has low and good electrical insulation properties. They have good resistance to brake fluids based on glycol, organic and inorganic acids and bases, hot water and steam up to 120° C. They have very good resistance to weathering and ageing.Butyl Rubber is not suitable for use with mineral based oils and aromatic solvents.
 
ETHYLENE PROPYLENE DIENE RUBBER (EPDM)
 Top

HARDNESS

CODE

EPDM 70°/75° SHORE 'A'

EPDM 80°/85° SHORE 'A'

EPDM 90°/95° SHORE 'A'

EP4/b

EP5/b

EP6/b

 

OPERATING TEMPERATURE:- -40°C to +120°C

EPDM elastomers have very good resistance to ozone, ageing and weathering. Hence, they are best suited for extruded profile sections and sealing strips. They have good resistance to swelling in hot water, steam, washing liquids, oxidizing media, acids, bases, and polar organic media, Ketones, fire retardant hydraulic fluids& hydraulic brake fluids.

 EPDM is not suitable for use in mineral based oils or hydrocarbons. But in non-mineral automotive brake fluids and phosphate esters, the swelling is minimal.
 
CHLOROBUTADIENE RUBBER (CR)
 Top

HARDNESS

CODE

CR 70°/75° SHORE 'A'

CR 80°/85° SHORE 'A'

CR 90°/95° SHORE 'A'

NP4/b

NP5/b

NP6/b

 

OPERATING TEMPERATURE:- -20°C to +100°C

CR is commonly known as NEOPRENE Rubber.

 

CR based compounds are characterized by excellent resistance to chemicals, ageing, weathering effects, and to ozone attack. It has resistance to swelling in mineral oils, greases and water is moderate.

 

CR compound are not resistant to aromatic compounds such as benzene, toluene, chlorinated hydrocarbons, esters, ethers and Ketones.
  SILICON RUBBER (VMQ) VINYL-METHYL-POLYSILOXANE Top

HARDNESS

CODE

VMQ 70°/75° SHORE 'A'

VMQ 80°/85° SHORE 'A'

VMQ 90°/95° SHORE 'A'

SL4/b

SL5/b

SL6/b

 

OPERATING TEMPERATURE:- -70°C to +200°C

SILICON Rubber is characterized by high thermal resistance, good cold flexibility, good dielectric properties, and very good resistance to oxygen and ozone attack. The main advantage is that it retains flexibility at very low temperatures and can withstand continuous heating without hardening, making it suitable for low and high temperature applications.

 

SILICON compounds have poor strength and tear resistance. Their resistance to oils and fuels is poor and also concentrated acids and alkalis, water and steam at temperatures over 100° C will destroy the material.
  FLUORO RUBBER (FPM) Top

HARDNESS

CODE

FPM 70°/75° SHORE 'A'

FPM 80°/85° SHORE 'A'

FPM 90°/95° SHORE 'A'

VT2/b

VT3/b

VT4/b

 

OPERATING TEMPERATURE:- -40°C to +220°C

FPM Rubber is commonly known by DU PONT trade name - VITON. The main characteristics of FPM are that it has resistance to high temperature & it has chemical stability. It displays minimal weight loss in high vacuum & has low permeability to gases.

 

VITON is compatible to fire resistant Hydraulic fluids, hot oils, greases, hydrocarbon, chlorinated hydrocarbons, a number of organic compounds, and most organic acids even at high concentrations. It has excellent resistance to hot water and to steam.

 

FPM however is not resistant to methanol, Ketones, esters and ethers.
  HYDROGENATED ACRYLONITRILE BUTADIENE RUBBER (HNBR) Top

HARDNESS

CODE

HNBR 70°/75° SHORE 'A'

HNBR 80°/85° SHORE 'A'

HNBR 90°/95° SHORE 'A'

NT42/a

NT42/b

NT34

 

OPERATING TEMPERATURE:- -30°C to +140°C

HNBR has good heat resistance, oil resistance & resistance to number of aggressive chemicals. The material exhibits high mechanical strength and improved abrasion resistance. It also has superior resistance to weathering, ozone and hot air and very good resistance to technical oils, even in the presence of hydrogen sulphide and amines.
  CARBOXYLATED NITRILE RUBBER (XNBR)

HARDNESS

CODE

XNBR 70°/75° SHORE 'A'

XNBR 80°/85° SHORE 'A'

XNBR 90°/95° SHORE'A'

NT23/b

NT24/b

NT25/b

 

OPERATING TEMPERATURE:- -30°C to +100°C

XNBR properties are similar to those of NBR polymers but they are characterized by improved abrasion behavior in applications subjected to dynamic stress.
  ACRYLONITRILE BUTADIENE RUBBER (NBR) Top

HARDNESS

CODE

NBR 70°/75° SHORE 'A'

NBR 80°/85° SHORE 'A'

NBR 90°/95° SHORE'A'

NT4/b

NT5/b

NT6/b

 


OPERATING TEMPERATURE:- -40°C to +100°C

Commonly known as NITRILE or BUNA-N

Nitrile rubber is the sealing material most frequently used in Hydraulic & Pneumatic systems because of its excellent resistance to mineral oil based fluids, greases, water and hydrocarbon fuels. It has good physical characteristics such as abrasion resistance and good compression set.

NBR is not suitable to Aromatic hydrocarbons, chlorinated hydrocarbons, automotive brake fluids, and some fire resistant hydraulic fluids.

MATERIAL COMPATIBILITY WITH COMMONLY USED WORKING FLUIDS

ORGANIC COMPOUNDS

NBR

CR

MVQ

FPM

EPDM

 Acetic Acid
 Oleic Acid
 Acetic Anhydride
 Acetyl Chloride
 Ethanol 
 Acetaldehyde
 Ethanolamine
 Aniline
 Trichlorethylene
 Chlorobenzene
 Tricrestyl Phodphate
 Dibutylphthalate
 Ethylene
 Hydrocarbon Octane
 Hydrocarbon Benzene
 Ketones Acetone
 Nitro Benzene
 Phenol

ES
SS
ES
ES
RS
ES
SS
ES
ES
ES
ES
ES
RS
RS
ES
ES
ES
ES

SS
SS
SS
ES
RS
ES
SS
SS
ES
ES
ES
ES
RS
SS
ES
SS
ES
SS

ES
SS
ES
ES
RS
ES
SS
RS
ES
ES
RS
RS
RS
ES
ES
SS
ES
RS

ES
RS
ES
ES
RS
ES
ES
SS
SS
SS
RS
ES
RS
RS
SS
ES
ES
RS

RS
SS
SS
SS
RS
RS
SS
SS
ES
ES
RS
SS
RS
ES
ES
RS
ES
SS

 

INORGANIC COMPOUNDS

NBR

CR

MVQ

FPM

EPDM

 Chromic Acid
 Hydrochloric Acid
 Nitric Acid
 Phoshoric Acid
 Sulphuric Acid
 Caustic Soda
 Ammonia
 Carbon Disulphide
 Hydrogen Peroxide
 Steam upto 3.5 Bar
 Water

SA
RS
SA
SS
SA
RS
RS
ES
ES
SS
RS

SA
RS
SA
RS
RS
RS
RS
ES
SS
SS
RS

SS
RS
SA
SS
SA
RS
RS
ES
SS
SS
RS

RS
RS
SS
RS
RS
SS
SA
RS
RS
SS
SS

SA
SA
SA
SS
ES
RS
RS
ES
SA
RS
RS

 

REFRIGERANTS

NBR

CR

MVQ

FPM

EPDM

 Ammonia
 Ethylene Glycol
 Freon 11(Arcton 11)
 Freon 12(Arcton 12)
 Freon 22(Arcton 22)
 Sulphur Dioxide

RS
RS
ES
RS
ES
ES

RS
RS
ES
RS
SS
SS

RS
RS
ES
ES
ES
RS

SA
SA
SS
SS
ES
RS

RS
RS
SS
SS
SS
RS

 

LUBRICANTS AND GREASES

NBR

CR

MVQ

FPM

EPDM

 Brake Fluid Castor Based
 Cellosolve
 Grease Mineral
 Ester Based DTD 825

ES
ES
RS
SS

SS
SS
SS
ES

RS
ES
SS
SS

ES
ES
RS
RS

RS
ES
ES
SS

 

HYDRULIC FLUIDS

NBR

CR

MVQ

FPM

EPDM

 Aqueous Eel 6
 Mineral Dtd 585
 Ester Based (skydrol 500)

RS
RS
ES

RS
SS
ES

RS
ES
ES

RS
RS
RS

SS
ES
ES

 

LUBRICATING OILS

NBR

CR

MVQ

FPM

EPDM

 Mineral Ded 2472
 Hypoid
 Ester Ded 2487
 Parffin
 Silicone Oils
 Transformer Oil
 Vegetable Oil

RS
RS
SS
SS
RS
RS
RS

RS
SS
ES
SS
RS
SS
RS

RS
RS
SS
ES
ES
SS
RS

RS
RS
RS
RS
RS
RS
RS

ES
ES
ES
ES
RS
ES
RS

 

GASES

NBR

CR

MVQ

FPM

EPDM

 Chlorine (wet)
 Calor Gas
 Carbon Dioxide
 Coal Gases
 Hydrogen
 Natural Gases
 Nitrogen
 Oxygen

SA
SS
RS
SS
RS
RS
RS
RS

SA
SA
RS
SS
RS
RS
RS
RS

ES
SS
RS
SS
RS
RS
RS
RS

SS
RS
RS
RS
RS
RS
RS
RS

SS
SS
SS
SS
RS
RS
RS
RS

 

FUELS

NBR

CR

MVQ

FPM

EPDM

 Diesel Oil
 Gas Oil
 Fuel Oil
 Petrol
Solvent Naphtha

SS
SS
SS
SS
ES

ES
ES
ES
ES
ES

SS
ES
ES
ES
ES

RS
RS
RS
RS
RS

ES
ES
SS
ES
ES

 

 MATERIAL

 LEGENDS

 NBR    -  ACRYLONITRILE BUTADIENE RUBBER
 CR      -  CHLOROBUTADINE RUBBER
 MVQ   -  SILICON RUBBER
 FPM   -   FLUORO RUBBER 
 EPDM -  ETHYLENE PROPYLENE DIENE RUBBER

 RS - RESISTANT TO SWELLING
 SS - SLIGHT SWELLING
 ES - EXCESSIVE SWELLING
 SA - SURFACE ATTACK