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.