

A more comprehensive study of aeration by Dinzburg8 showed that even a minimal level of aeration of an aggressive European SF oil led to protection of a VDF/HFP/TFE compound, but to severe deterioration of an HNBR compound. He notes that aeration increases the severity of aging in oil for silicone and acrylic elastomers, while decreasing the severity for FKM elastomers.
Oil seals, often called a rotary shaft seal or grease seal, closes the gap between stationary and moving components in mechanical equipment — most often rotating shafts — helping prevent lubricant escape and stopping harmful materials, such as dirt, from moving in through the clearance. Oil seals are most commonly used in gearboxes, hydraulic cylinders, and related components.
It is important to regularly inspect and replace worn-out piston oil seals to ensure the proper functioning of the engine. This can help to prevent costly repairs and extend the life of the engine.

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Other important factors are ensuring the hardness and roughness of the shaft are correct. A shaft hardness of HRC 45 is recommended for a rubber sealing lip, with a roughness of Ra 0.4-0.8. A higher shaft hardness of HRC 60 and shaft roughness of Ra 0.1-0.4 is recommended for a PTFE lip.
In addition to their reliability and durability, floating oil seals are also easy to install and maintain
. These seals do not require complex installation procedures or special tools, making them a cost-effective solution for businesses looking to minimize downtime and reduce maintenance costs. With proper care and regular inspection, floating oil seals can continue to provide effective sealing performance for years to come.
Figure 14.1. Shaft seals (DuPont Dow Elastomers).
(visible lead marks)
Among the most common causes of oil seal failure are:


There are four general motor oil types:
Viton (FKM/FPM) Oil Seals
Types Of Oil Additives
R
What are rotary shaft seals?