designer

Rubber Characteristics

Rubber properties

Type Advantages Limitations
NBR
  • Cost efficient & prevalent
  • Abrasion & tear resistant
  • Water & oil resistant
  • Poor weather and ozone resistance
FPM (VITON)
  • Applicable for most grease/oil
  • Excellent under high temp.
  • Long usage life
  • Expensive
  • Moderate performance under low temp.
ACM
  • Mineral & gear oil
  • Aging & tear resistant
  • Applicable for high - speed rotation
  • Moderate under low temp.
  • Not for dry-running
  • Not usable in aqueous media
  • Better than NBR under hightemp.
  • More costly than NBR
SIL
  • Weathering/ozone resistant
  • Poor oil / fuel resistance
EPDM
  • Chemical resistant
  • Electrical isolation
  • Weathering/ozone resistant
  • Not usable in gasoline
PTFE
  • Excellent for dry-running
  • Chemical resistant
  • Low coefficient of friction
  • High thermal expansion
HNBR
  • Applicable for most grease / oil
  • Excellent under high temp.
  • Long usage life
  • Cold resistance better than NBR
  • Expensive
SBR
  • Excellent under high temp.
  • Long usage life
  • Water resistant
  • Not usable in outside environment, UV and ozone
  • Low flexibility
  • Poor adhesion

Common used rubbers

Type Name ASTM
NBR Nitrile rubber BF,BG,BK,CH
FPM (VITON/FKM) Fluorocarbon rubber HK
ACM Polyacrylate rubber DF,DH
SIL Silicone rubber FC,FE,GE
EPDM Ethylene propylene rubber BA,CA,DA
PTFE Polyterafluoro ethylene
PU Urethane rubber BG
AEM Ethylene/Acrylic rubber (VAMAC) EE,EF,EG
CR Chloroprene rubber BC,BE
HNBR Hydrogenated NBR rubber DH
SBR Styrene Butadiene Rubber AA

Rubber specifications

NBR FPM ACM SIL EPDM PU CR SBR
Tensile Strength
Elongation
Rebound Resistance
Tear Resistance
Abrasion-Resistance
Impact Strength Resistance
Gas Impermeability Resistance
Ozone Resistance
Weathering Resistance
Flame Resistance
Heat Resistance
Low Temperature Resistance
Oil and Fuel Resistance
Animal and Vegetable Oil Resistance
Alcohol Resistance
Alkaline Resistance
Acid Resistance
Aliphatic-solvent Resistance
- Aliphatic
- Aromatic
Oxygenated-Solvent Resistance
Water Resistance
◎ Excellent
● Good
■ Suitable
△ Limited
▼ Poor

Rubber Specification Reference Table:

  • Note for special type: ‘___-PL’ means oil seals are manufactured with TEFLON.
  • Note: Numbers are composed of six digits. For example 4NK701 Rubber Code (4), NBR (N), Black (K), 70 SHA (7), Serial Number (01)
MATERIAL COLOR HARDNESS
Code >Explanation Code Explanation Code Explanation
N NBR W White A 95
F FKM/VITON K Black 9 90
V VAMAC B Blue B 85
E EPDM R Red 8 80
C CR/NEOPRENE T Gray C 75
S SILICONE G Green 7 70
A ACM N Brown D 65
P PU O Orange 6 60
L FLS (LEATHER) P Purple E 55
H HNBR C Transparent 5 50
X XNBR Y Yellow F 45
R NR Note: Above colors are based on TCS standard, for other special colors, please take PANTONE for reference. 4 40

Material Temperature Range - Celsius (°C):

Material Temperature Range - Fahrenheit (°F):

Shaft RPM, surface speed, and seal material application:

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