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(1). There are various styles of rubber seals, and the bearing's operating conditions may vary depending on the sealing material. Here are some examples of sealing materials for reference：
|
Rubber Name Code |
Characteristics |
Operating Temperature°C |
|---|---|---|
|
NBR |
Good resistance to oil, wear, and heat. |
-40~120°C |
|
FKM |
Good heat resistance, resistance to acids, alkalis, and chemical substances, excellent oil resistance. |
-20-200°C |
|
VMQ |
Good heat resistance, good cold resistance, minimal compression set, but weak mechanical strength. |
-60-230°C |
|
ACM |
Better heat and oil resistance than NBR, but not strong against water and alkalis. |
-20~150°C |
(2). Characteristics of Sealing：
|
|
Type |
||
|
Characteristics |
ZZ |
2RU |
2RS |
|
Iow friction torque |
A |
A |
B |
|
high speed |
A |
A |
B |
|
grease seal |
B |
A |
AA |
|
dustproof |
B |
A |
AA |
|
waterproof |
C |
B |
A |
※ AA: utmost excellent、A: excellent、B: good、C: bad
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