Jacketed Gaskets: Here’s Why & Where You’d Use One.

Have you ever dealt with applications that require jacketed (or sometimes called double jacketed) gaskets? While the technology may not be as commonly used as others, it is one that definitely has its place in the sealing world.

In today’s post, we’re going to address what they are, as well as why and where you would use one.

The Details

What is a jacketed gasket?

A jacketed gasket has a construction composed of a soft filler material, wrapped by a metal outer layer. Often, this is a two-piece metal construction with a flat layer against the soft facing and a wrap layer that wraps at both sides to form a complete enclosure to encapsulate the filler.

Why would I need a jacketed gasket?

High pressure/high temperature applications often need a rigid shield to resist blowout. Also, the jacketing feature protects the core layer from the conditions.

Where would I use a jacketed gasket?

These gaskets are used in high pressure and high temperature applications where flange areas are limited, but a rigid construction is needed. They are also used in high load exhaust applications, heat exchangers, and pipe flange gasket connections.

Does material selection matter?

Of course it does! The metal layer must be chosen for the environment, with stainless being preferred. Also, the filler material can come from a variety of choices. Often a tanged core graphite or fiber layer is chosen for it’s compressibility yet rigidity in handling and durability for long-term performance.

Meeting Your Needs

It is important to continue to educate yourself on the various gasket technologies available in order to make the smartest choice for your particular needs. As always, your trusted gasket material supplier(s) will often be a great resource for you when it comes time to narrow down your choices. Understanding jacketed gaskets and the applications that they are suited for will make it that much easier to make your decision.

How often do you work with jacketed gaskets?Hi-Tex Product Comparison

The Top 6 Applications Where Composite Gaskets Excel

There are a handful of gasket materials and technologies that are acceptable for a variety of conditions within an application. However, as you venture into specific conditions, those options start to narrow – especially as you get into higher temperature and higher pressure applications.

As an experienced materials manufacturer, when we hear a customer or potential customer start talking about gasketing needs, there are certain applications where we know immediately that metal reinforced composite laminates are a great option. To help you in your planning process, we decided to put together a list of the top applications where these types of gaskets excel (in no particular order).

Look to Composites

1. Exhaust system gaskets

Composite laminates work well in exhaust systems because they tolerate heat and distortion of the flanges. They can also be made with a stainless steel core to resist corrosion and provide long term performance.

2. Aftertreatment system gaskets (DPR, EGR, etc.)

Composite materials perform well here with the rigidity of the steel core for strength and the sealability of the facing material in aftertreatment joints.

3. Manifold gaskets (exhaust/intake)

Graphite laminates are one example of a composite laminate that works well in exhaust manifold gaskets. The material helps to manage heat flow while maintaining a seal.

4. Collector gaskets

Collector gaskets are generally high temperature flanged joints that require a compressible material to seal the joint. Often, composite materials are the first choice here due to their economic advantage and compressible nature.

5. Cylinder head gaskets

Head gaskets have been successfully made from graphite composite laminates since the mid 1980’s. These gaskets perform well as they seal a variety of surfaces while managing heat and providing long-term service.

6. Aftermarket/replacement gaskets (head, exhaust, and intake applications)

Composite laminates are by far the best choice in aftermarket/replacement applications. They provide additional compressibility and conformance to seal against less-than-ideal flange surfaces while compensating for removed material such as surfaces that are refinished. Composites also provide lasting service with their ability to compress and recover in these applications.

Materials that Survive

If you’re dealing with applications that meet any of these conditions, it is important to be aware of the types of materials that are known for successfully sealing them. Once you have an awareness of the general direction you should be going in, talk to a gasket material supplier that specializes in that type of material. Then, you can narrow down your choices to the one material that is best suited for the conditions it will need to withstand.

What are the other applications where you prefer metal reinforced composites?

Aftertreatment Systems Material Guide

What’s So Special About Gasket Material for Exhaust?

Hot, Hot, HOT!! If you’re well versed in combustion engines, you likely associate exhaust systems with extreme heat. If you’re also well versed in gasket materials and how they perform in heat, you likely know that it takes a special material to withstand the conditions present in an exhaust system.

If you aren’t sure about what to look for in an exhaust gasket material, read on to learn how to identify a material that will survive in the exhaust environment.

Ideal Exhaust Gasket Material Characteristics

The harsh environments of exhaust systems can present a challenge if you don’t use acceptable gasket materials. Finding something to withstand the hot gases requires materials specifically designed to survive such conditions. What characteristics should you look for when selecting a gasket material?

1. Metal reinforcement

This provides strength and durability to maintain position in the face of the extreme conditions.

2. Heat tolerant facing material

Facing material must withstand heat of exhaust without disintegration over the life of the seal. Materials behave differently over time, be sure to choose what is best for you.

3. Abrasion resistance

This might be a factor in joints with high thermal motion, such as joints of dissimilar metals that expand and contract at different rates. In these cases, often a clad-style material is chosen. MTI offers the AR400 for situations such as this.

4. Low creep relaxation

Graphite products are a good example of a facing with low creep relaxation. This means it will not continue to lose thickness with the heat and time exposure, thus maintaining good flange loading to maintain the seal.

Making Your Decision

As we’ve said before, there is no one perfect gasket material out there for any application. There are a handful of materials that will meet the requirements of an application and it is up to you to decide which one performs best. In order to better educate yourself, you may need to talk to your trusted gasket material supplier and see what they say about a specific material and how it performs in applications similar to yours.

Until next time!Armor product comparison

I Need A Gasket With a Tanged Insert…What Is That?

The other day we received a call inquiring about gaskets with tanged inserts, what type of material they required, and if we sold the materials. Quite simply, the answer is yes, we do sell gasket material with a tanged insert, that’s exactly what we do!

We could have left it at that, but in the spirit of educating our loyal readers, we thought we’d create this post to add a little more to the conversation because it brings up an interesting point – how many times does someone not really know what they are looking for because of the name that is used? For someone not completely in “the know”, it can be confusing trying to navigate all of the information out there and make a smart decision.

So, here’s what you need to know about gaskets with a tanged insert.

About Tanged Inserts

1. What is it?

Metal (typically a carbon steel or stainless steel) punctured through a perforating process and combined with facing materials (typically fibers, graphites and other high temperature materials). They are typically 3 layers, and the “fingers” or “tangs” in the punctured metal are attached to the facing through a combining process creating a mechanical bond. Typically, no adhesive is required.

2. In what applications is it used?

Gaskets with tanged inserts are typically found in high temperature and high pressure seal points. The tanged insert provides radial strength which helps to prevent blowouts. These gaskets are often used in exhaust, head gaskets, intake manifolds, turbo chargers, EGRs, catalytic converters, etc. Generally, the mechanically bonded materials are perfectly suited for exhaust environments and remove the concern that an adhesively-bonded product might delaminate in the same heat.

3. What temperatures can it withstand?

Most of the time when you’re needing a gasket with a tanged insert, you are dealing with temperatures that exceed 800°F. Some of them are rated for applications that see temperature peaks that push 2000°F. With such high temperatures, many are also starting to find a need for gaskets with insulative properties to protect sensitive components on one side of the flange. There are gaskets with tanged inserts that do this…and you’d be hard pressed to find another type of material that achieves the same results. MTI offers the HT400 and HT514, which are specifically used when insulative properties are needed.

4. How do you cut it?

A lot of fabricators are hesitant to cut gaskets with tanged inserts if they’ve never done it before. The good news is, they can be cut with many of the traditional cutting methods…steel rule die, hard tools, laser, water jet or knife table…just talk to your trusted gasket material supplier to know which method may produce the best results on a particular material.

Does This Sound Familiar?

After reading about the characteristics of gaskets with tanged inserts, does any of it sound familiar? These materials go by different names which may be more familiar to you…metal reinforced materials, tang core materials, perforated (perf) core materials, metal reinforced composite laminates, etc. Although it may seem like there are endless decisions when it comes to various gasket materials, there are really only a handful of legitimate types (with a lot of aliases).

Deciding on a gasket material boils down to the following questions: what are the requirements of your application, and which materials are best suited to handle these requirements? There isn’t a one-size-fits-all gasket material (contrary to what some may say). Understand the requirements, understand the limitations of each material, then make the decision that best meets your needs. As always, rely on your trusted gasket material supplier to help guide the decision making process.

This was our 50th blog post! Let us know how you’ve liked the content so far, and what you’d like to see more of over the next 50 posts.Hi-Tex Product Comparison

Gasket Material Showdown: Vermiculite vs Graphite

Have you ever been doing research on a product and instead of being forced to read through a lot of mumbo-jumbo, you just want a nice eye chart with a little bit of explanation around it? Well, if you’re researching gasket materials and specifically want to see the differences between vermiculite and graphite, you’re in luck!

Each of these materials can hold its own, but they do have their specific strengths. Depending on your application, either vermiculite or graphite is going to be your best bet. Which one are you willing to put your money on?

What’s the Difference?

Vermiculite vs Graphite

In general, when you are working with exhaust applications with high temps and signs of oxidation, you will want to look at a vermiculite product because it will resist oxidation more than graphite. If you are working with exhaust applications where sealabilty is critical and temperatures are not extreme, the graphites are going to meet your needs. If temperatures prove to be too much for the graphite, a vermiculite-based product is your next step.

Find The Right Material

This breakdown should get you pointed in the right direction on your quest to find the best gasket material for your application. You don’t need to do it alone, though. If you still aren’t sure what you need, talk with your trusted gasket material supplier. They can give you the pros and cons of all of their materials and help you narrow down the choices in preparation for your testing.

A gasket material that works is your ace in the hole!

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