SKF - Rolling Bearings

Designs and variants
Chemical resistance
Most polymers can resist the damaging effects
of commonly used chemicals.
Polypropylene (PP) resists acids, alkalis,
salts and salt solutions, alcohols, oils, greases,
waxes and many solvents. However, exposure
to aromatic compounds and halogenated
hydrocarbons cause the material to swell. PP
also does not resist strong oxidizing media like
nitric acid, chromates or halogens.
Polyoxymethylene (POM) resists weak acids,
weak and strong alkalis and organic solvents
as well as gasoline, benzene, oils and alcohols.
Polyamide 66 (PA66) resists almost all
organic solvents as well as some weak acids
and alkalis.
Table 3 provides an overview of the chemical
resistance of available materials to common
substances.
For additional information, refer to Factors
influencing bearing performance
(† page 1259).
Table 3
Chemical resistance of available materials to common substances
Standard materials
Alternative materials
Chemical group
POM/POM sooted
PP
PA66
Stainless steel 1.4401
Glass
PE
PEEK
PET
PVDF
PPS
PI
Borosilicate glass
Stainless steel 1.4034
Titanium
Si 3 N 4
Al 2 O 3
ZrO 2
Brass
Hydrocarbons
– aliphatic + + + o + + + + + + + + + + + + + +
– aromatic + + o + o o + o + o o + + + + + + +
– halogenic + o o – o o o o + + o + + + + + + o
Acids
– weak o + o o + + + + + + + + + + + + + o
– strong – + – o o + – o + o + + – o + + + –
– oxdizing – – – o + o – – o – – + – + + + + –
– hydrofluoric acid – o – o – o – – + o o – – – o – – –
Alkalis
– weak + + o o + + + o + + + + + o o + + –
– strong + + o o o + + – – o o o o o – + + –
Mineral lubricants + + + + + + + + + + + + + + + + + +
Gasoline + + + + + + + + + + + + + + + + + +
Alcohols + + + + + + + + + + + + + + + + + +
Acetone + + + + + + + o – + o + + + + + + +
+ = good resistance: o = limited resistance: – = low resistance:
Can generally be used.
Bearing suitability should be
tested under operating
conditions.
Cannot be used.
15H
1251