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　　Different types of oil seals

　　Do you want to keep your machine away from any unwanted leaks, but aren't
sure which oil seal is right for your needs? This guide will provide you with
everything you need to know in order to choose the right one for your
application.

　　Oil seals, also known as rotary shaft seals, fluid seals or grease seals,
play an important role in closing the gap between the moving and stationary
elements of mechanical equipment.

　　Automotive Oil Seals

　　By preventing the leakage of lubricants, they protect critical parts of
machinery from damage caused by leaks of various fluids. These Automotive Oil
Seals are used from automotive engines to assembly machines to remain free from
any harmful effects that can cause serious and costly damage to any of its
critical components.

　　What is a rotary shaft seal?

　　Rotary shaft or oil seals are placed between moving and stationary
mechanical parts to ensure that contaminants, moisture, corrosive materials and
abrasives do not damage various components. They also prevent unwanted mixing
of fluids, including water and oil, from combining within the machine.

　　How are oil seals made?

　　First, an elastomer, most commonly nitrile rubber, is vulcanized to a metal
ring. This creates a stiffening effect, including a specialized metal tension
spring directly behind the seal lip, which keeps the oil seal firmly attached
to the moving parts.

　　Oil Seal Materials

　　There are many different materials used to make oil seals.

　　Leather Oil Seals - Leather oil seals, also known as L-shaped oil seals,
are most commonly used for parts that are contaminated and poorly lubricated.
Because leather oil seals are pre-lubricated and absorb fluids, they are able
to provide sealing performance in situations where synthetic rubber cannot.

　　Synthetic Rubber Oil Seal- Styrene-butadiene rubber oil seals, or just SBR
oil seals, are highly resistant to wear and damage, making them ideal seals for
fast moving machinery. They can be used for outdoor components due to their
heat aging properties that can withstand extreme temperatures. They are also
considered to be more cost effective oil seals than natural rubber.

　　Nitrile Oil Seals - Nitrile oil seals is the common term for acrylonitrile-
butadiene rubber seals and is a very good general purpose choice due to the
flexibility of use on a wide variety of components. The high resistance to
fats, hot water, gasoline, mineral oil, grease and animal oil makes them the
most commonly used oil seal. They do not have a large temperature range, making
them a poor choice for machines with drastic temperature changes.

　　Fluoroelastomer oil seals - Fluoroelastomers are synthetic rubber and
fluoropolymer elastomers used to make oil seals that offer resistance in both
high temperature and low compression permanent deformation components. They
also have high chemical and wear resistance, so they can be used in components
that frequently interact with petroleum and solvents.

　　Polyacrylate oil seals - Mostly selected for automotive and transmission
use, polyacrylate oil seals withstand fuel, oil, ozone, sunlight and weather
when in use. They are the perfect choice due to the exposure of the car to all
these different fluids and elements. However, they should not be used at low
temperatures as their flexibility is diminished at low temperatures.

　　Silicone seals - Designed to absorb lubricants to reduce wear and friction,
silicone rotary shafts also have high thermal resistance and a large
temperature range. However, they do not handle wear well or interact with
oxidized oils.

　　PTFE Oil Seals - A relatively new and exciting type of oil seal, the use of
PTFE means they can withstand dry or unlubricated operation. With a huge
thermal range of -130ºC to +200ºC and strong chemical resistance, they are
considered to be the future of rotary shaft seals.

　　How to choose the right oil seal?

　　When selecting an oil seal for your next project, there are several key
factors to consider to ensure protection from immediate and long-term damage to
machinery.

　　Pressure - Many oil seals can only withstand low pressure applications, so
it is critical to understand the permanent deformation of the component in
compression.

　　Temperature - Just like pressure, it is important to know the operating
temperature of the oil seal so that you can select one that can withstand high
or low temperatures. PTFE has the widest temperature range, making it ideal for
machines used in extreme weather or components.

　　Shaft speed - Considering the speed the shaft will be moving, runout,
bearing housing bore and the type of oil being sealed is critical to ensure
that you select an oil seal that will not be affected by wear or spiral
deformation.

　　Fluid type - Various oil seals can withstand interaction with oil, fuel,
grease, water, etc. Knowing what type of fluid the rotary shaft seal will be in
constant contact with will ensure the longevity of the seal and surrounding
components.

　　Amount of lubricant - Seals always perform best when lubricated, but in
some machines are more likely to dry out. For these cases, it will be
beneficial to choose leather or PTFE seals, as both have less lubricity than
other seals.

　　We hope you find the above sharing helpful, plus the company also has Kdik
Combi Oil Seal available, contact us today to ensure you have selected the
right rotary shaft seal to protect your components and bring long and healthy
life to all your machines!

Minimum Order: 10 pieces

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