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Protecting your seals

Dust gets everywhere.  We see it across the surfaces of our homes and even in our workplaces, especially when the light shines through to show it in its full glory!  However, dust that seeps and builds up within engineering equipment can be disastrous.  Causing damage...

Importance of durometer testing

Durometer or shore durometer is a way for industry professionals to measure how hard such things as plastic, rubber, and non-metallic materials genuinely are.  Its focus is to measure on a Shore A or Shore D scale, looking at how robust material is when examining its...

Metal Detectable O Rings

Metal detectable o rings became a necessary must when it was identified that some chemicals, exposure to extreme temperatures, and continuous vibrations could cause failings in standard o rings.  Failings that not only mean a breaking of the seal, but there is also an...

Tips for best o ring maintenance

If o rings are not maintained, leaks can occur, and water and other fluids can enter the appliance or application, and even product in the mix!  If this happens, damage can occur to internal parts and mechanisms, causing deployment failings, potential false readings,...

What you need to know about O Ring Lubricants

Silicone grease and lubricants aren’t just a nice to have for o rings, but they can quite often be a must-have.  However, with so many greases and lubricants to choose from, it can often be a minefield choosing the best ones and the right ones for your o ring and...

O Ring Replacement

Replacing an O Ring in pressure washer wands is probably one of the most common replacements you'll find when working with seals.  Unfortunately, O Rings don't last forever, and over time they do deteriorate, and you will require an O Ring replacement.  It's important...

Reasons behind seal failure and a look into seal replacement

Unfortunately, there are occasions where O-rings, in particular, fail.  The failure of these seals is not simply due to one factor, but various factors that can occur across a range of applications – hence why locating the exact cause of such problems is just that, a...

Gaskets and seals for Aerospace

Gaskets and seals used for aerospace applications and equipment must be of premium quality and to a substantially high standard.  They are used across a range of applications such as radars, antennas, lighting, access panels, electrical conductivity, pressure sealing,...

Finding the best sealing materials for Food Grade Applications

You will find rubber seals across various industries, providing an important element and operating as a vital fixing across a wide range of different applications and equipment.  However, these FDA gaskets must follow strict, set guidelines, in terms of their material...

The Evolution of Gasket Solutions

When we talk about gaskets and the history of a gasket, we must start at the very beginning.  What is a gasket?  Ultimately, a gasket is a manufactured seal that is used to fill the gap/space between two or more surfaces.  Gaskets are typically manufactured by cutting...

Protecting your seals

Protecting your sealsDust gets everywhere. 

We see it across the surfaces of our homes and even in our workplaces, especially when the light shines through to show it in its full glory! 

However, dust that seeps and builds up within engineering equipment can be disastrous. 

Causing damage to cylinder walls, dust can also cause significant damage and disruption to rods and seals. 

It’s not just dust either; mud, debris, dirt, and even excess water can cause severe mechanical systems problems if they aren’t properly maintained and seal bearings housed. 

Problems such as friction, surface wear, and an imperfect seal contact can all occur. 

This is why many different types of applications need to stay clean both on the outside and inside.  Equipment like hydraulic cylinders, snow ploughs, seals in logging, earthmovers, etc. 

Top tips to keep systems and machinery dust-free 

For seals and bearings and protecting them from the elements, we have various components at our disposal to help keep dust and dirt at bay. 

The three main components which we’ll be talking about below all attach to the exterior side of the main seal in the system, and the component you require will depend on what you’re protecting your machinery from. 

For example: 

Wipers – used across lighter applications to seal fine material, dust, water, and wet mud.   Wipers are made from rubber (a firm elastomer) or soft plastic and are ideal if you’re looking for easy assembly and low friction. 

Scrapers – used for more aggressive applications, sealing out hard, solid debris such as ice and dry mud. Scrapers are manufactured from hard plastic or, most commonly, brass.  Unfortunately, scrapers still let finer material slip through the net, and piston and rod lubrication leakage can still occur, attracting further dust. 

Excluders – these tend to be the middle ground between wipers and scrapers regarding the level of protection they provide.  Sealing out medium level materials, excluders are most commonly found in hydraulic cylinders and can help prevent contamination due to their prolonged seal life.   Excluders are great for more rugged applications i.e., keeping mud out of brake cylinders, for example. 

Note:  Excluders can also be combined within the pneumatic cylinders’ inner seal, helping to provide a quality fit and low friction. 

Scrapers, wipers, and excluders come in all shapes and sizes depending on your requirements – make sure to speak to one of the expert team at SSP to find out more. 

Dust seals for bearings 

To help keep your bearings clean within applications, you firstly need to keep the surrounding environment clean. 

You then need to choose the best shaft seal and shaft configuration to protect bearings from dust and moisture ingress (shaft seals help close the gap between the housing where your bearing is contained and the shaft).  Rubber seals are the most common and durable in this respect. 

However, rubber or labyrinth seals will work well in dusty environments. 

Labyrinth seals do require a straight shaft, whereas rubber seals allow for more flexibility. 

If dust is a big contamination problem, the seal shaft arrangement may need to be redesigned to increase the level of protection. 

Solutions in these instances include: 

  • Parallel configuration for seals and combination seals 
  • The use of wiping devices that are spring-loaded. 
  • Installing a stuffing box in the gap between the housing and the end of the equipment. 
  • Using a felt seal throughout the equipment and the housing, cleaning the shaft via brushing. 
  • Creating a barrier by greasing the two seals, flushing out any past seals. 
  • Fitting mechanical seals, or auxiliary seals, as these seals can come into contact with the dust and water first. 

A point to note: It is essential that the assembly of the bearings and the housing is 100% clean because even with all of the best external protection bearings will still suffer premature failure if the bearing is contaminated at the assembly stage. 

A note about Breathers 

Breathers found on housings will allow some dust and moisture to get inside the bearing, adding to its premature failure. 

To avoid such situations, you could opt to replace breathers with air filters that are low micron, as these remove dust particles up to two microns and greater in size. 

Our team is on hand at Specialist Sealing Products to help you with all of your gaskets and sealing equipment and products. 

Call us today on 01535 274 776 or visit our website and see how we can help you. 

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