1. what type of gas are you sealing? (i.e. exhaust gas? Diesel?)
Different gases present different challenges due to their varying nature. Depending on what you are sealing, you may need to choose alternative materials.
2. Is it a corrosive environment? (i.e., the presence of urea?)
If so, it may require stainless steel reinforcement to withstand the corrosion. Other materials may not survive.
3. what temperature will the joint see? Is there expansion/contraction?
These answers will determine the material you should concentrate on. When working with gases, you will typically see temperatures above 1000°F, which makes certain types of materials inadequate. If you see expansion/contraction, you need to choose a material that can withstand the changing conditions and still remain sealed. 4.
4. What kind of design life are you designing for? Is this gasket designed for price or performance?
As with every design, knowing the end goal will help your gasket material supplier to recommend a material for you. If price is the driving factor and performance is secondary, then you will likely end up with a different material than if performance is paramount and price is irrelevant.
Bonded Seal 