SBR RUBBER BALLS

Styrene butadiene copolymer balls, they feature good mechanical properties, excellent abrasion, wear and permanent defomation resistance. They are not suitable in outdoor applications and they feature even low aging resistance.
Applications
Special pumps and valves as sealing elements, mixing devices, automotive field.
Technical name
Commercial name
Abbreviation
Styrene-butadiene
Buna-S
SBR
Physical / mechanical / thermal / electric / magnetic properties
Property
Symbol
U.o.M.
Type
Notes
Values
Density
δ
[g/cm3]
Physical
Room temp.
1.23
Young's modulus
E
[MPa]
Mechanical
-
6
Elongation at break
A
%
Mechanical
Room temp.
max 700
Compression set
-
%
Mechanical
Room temp.
25
Friction coefficient
µ
-
Mechanical
Room temp.
0.82
Coefficient of linear thermal expansion
α
[10^-6/ºC]
Thermal
(ΔT=0-100°C)
180
Thermal conductivity
λ
[W/(m·K)]
Thermal
Room temp.
0.17
Electric resistivity
ρ
[Ohm.mm2/m]
Electric
-
> 10^19
Relative magnetic permeability
µ
-
Magnetic
Diamagnetic
<~1
Technical data
Property
Type
U.o.M.
Values
U.o.M.
Values
Hardness
Mechanical
[Shore A]
50 - 95
-
-
Ultimate tensile strength
Mechanical
[MPa]
5 - 20
[psix10^3]
0.73 - 2.90
Service temperature
Thermal
[ºC]
-50 / 90
[ºF]
-58 / 194
Range
Diameters (min/max)
U.o.M.
Diameters (min/max)
U.o.M.
Precision Grade
4.750 - 150.000
[mm]
3/16 | 5.3/4
["]
III
Corrosion Resistance
Good resistance against water, fair in contact with alcohols, ketones, glycols, brake fluids, diluted acids and basis. They are not suitable in contact with oils and fat, aliphatic and aromatic hydrocarbons, petroleum products, esters, ethers, oxygen, ozone, strong acids and basis.
Revision n.2