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

Solid Core vs Perforated Core Gasket Materials – What Are the Features of Each?

Let’s say that you’ve decided to explore a composite gasket material solution for your application. (If you need a refresher on why you may make that decision, visit the blog post “Why Would I Use Composite Gasket Material When I Can Use MLS?”)

If you’re unfamiliar with the options and the materials used, composites can be very overwhelming. However, we’re here to help explain it as straightforwardly as possible. Basically, there are two main types of technologies used – perforated core (mechanically bonded) and solid core (chemically bonded).

Ok…so what’s what, and what are the features of each?

Perforated Core Gasket Material

Perforated core…otherwise known as mechanically bonded, mechanically clinched, or tang core. These materials are most commonly used for head gaskets, intake manifold gaskets, exhaust gaskets, and other high temperature and high pressure seal points. Below are a few features of the perforated core materials:

1. Mechanical bond requires no adhesive to deal with temperature effect.

2. Tanged core provides lateral strength for blowout resistance.

3. Tanged core provides vertical strength for load balance and torque retention.

4. Steel core perforations “grip” the facing, preventing slippage or distortion.

Solid Core Gasket Material

You may also refer to solid core materials as adhesively bonded materials. These materials are commonly used in fluid sealing applications as well as some head gaskets, intake manifold gaskets, cover gaskets, and other (lower temperature applications). Here are the features that you’ll see with solid core materials:

1. Metal core provides stiffness for ease of handling. Ease of assembly.

2. Lateral strength of laminate prevents crush and blowout of gasket and provides enhanced sealing properties. Gaskets can withstand higher pressures than non-reinforced fiber products.

3. Dimensional stability is protected. Gasket will not shrink or grow with moisture.

4. Gasket is more robust than plain fiber gaskets to survive both handling in assembly and performance in the joint.

A Material for Every Application

Between perforated core and solid core, you have a material to consider for almost every high temperature or high pressure application you come across. If you have any questions about which materials to consider for your specific project, don’t hesitate to ask your trusted gasket material supplier. You don’t need to know it all if you have a good resource for the information.

What other features do you like about these materials?

Surbond product comparison