Technical data

35
Compressed Air Applications Manual | Material
Sealing materials (elastomers)
Depending on the specific operating
and load conditions, the lifetime of seal-
ing materials can vary greatly from that
of the pipe material.
In the case of compressed air applica-
tion with mineral oil containing air, NBR
or FPM seals have to be used instead of
EPDM seals.
Sealing material General chemical/physical
resistance
Max. operating temperature
EPDM
ethylene-propylene diene rubber
Resistant against aggressive,
oxidizing fluids
Not resistant against hydrocar-
bons, mineral oils and fats
90
0
C (short-time 120
0
C)
NBR
nitrile rubber
Resistant against hydrocarbons,
oils and fats
Not resistant against oxidizing
fluids
90
0
C (short-time 120
0
C)
FPM
fluorinated rubber
Resistant against aggressive,
oxidizing fluids such as hydro-
carbons, solvents, oils and fats
150
0
C (short-time 200
0
C)
Characteristics of polybutene
Mechanical and physical characteristics
Characteristics Value Unit Test
standard
Density 0.93 g/cm
3
DIN 53479
Melting range 122-128
0
C DTA
Vicat softening temperature 113
0
C DIN 53735
Glass temperature - 18
0
C ASTM D-746
Heat of fusion ~ 100 kJ/kg DSC
Thermal conductivity 0.22 W/mK DIN 52612
Thermal expansion coefficient 0.13 mm/mK DIN 53752
Modulus of elasticity 350 MPa DIN 53457
Shore hardness 53 D-Skala ISO 8608
Notched impact strength 40 (0
0
C) kJ/m
2
DIN 53453
Elongation at break > 125 % DIN 53457
Tensile strength 33 MPa DIN 53455
Yield stress 17 MPa DIN 53455
Heat capacity 1.8 kJ/kgK
Compressed Air Applications Manual | Material