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Polyimide Sheet
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 Kapton Polyimide 200 Gauge 8"x12" 3 Sheets, Free S&H  US $7.99
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 Kapton Polyimide 100TAB-E 8"x12" 3 Sheets, Free S&H US $5.99
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 KAPTON FILM .003x24"x48" POLYIMIDE SHEET 5355x-4 US $48.00
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Here are some more information for Polyimide Sheet:
Polyimide is one of the most heat resistant and fire resistant polymer known to mankind. Many times, the chemical resistances of this substance makes use to replace even glass and many metals in industries. Apart from industrial use, they are also used in the daily applications. They are extensively used to construct struts and chassis of the cars because of the fact that they can withstand heat and corrosion to a great extent. They are very useful in microwaves and food packaging as they are thermally stable and resistant to oils. They are also transparent to radiations.
Polyimide can be formulated as either thermosets or thermoplastics. Thermosets resins normally help produce moldings and laminates. It is not like plastic. It is available in many different shapes. They can be found as films, laminates, rods, tubes, stock shapes, molded shapes and plates. Some producers generate polyimide as resins as well. Polyimide sheet is most commonly used among all the other types.
Polyimide has many advantages that make it a very good substance to use. It has a low dielectric constant and a low thermal expansion coefficient. It is very flexible and can be polished even to surfaces of Angstrom level. It has a superb dimensional stability and a low water absorption rate. It is withstand immense temperatures and remains stable at high temperatures. It remains unaffected if exposed to weak acids. Hydrocarbons, esters, ethers, alcohols and kerosene can not deteriorate the quality of this extremely useful substance. It excels to work in machines. It is non-contaminating and has excellent mechanical durability. Hence it has wonderful electrical, physical and mechanical properties.
Because of its excellent features, polyimide has earned a reputation that allows it to be used extensively in many areas. It is a very commonly used substance in the electronic industry. It is used in flexible cables, on magnetic wires as insulating films and also on medical tubing. Laptops are the most common example where polyimide is used. The cable that allows the screen of laptop to open and close each time makes use of polyimide only. Apart from the electric field, the semi-conductors also find this material very useful. Because it works as a high-temperature adhesive, it can serve the purpose of the buffer for mechanical stress.
Demand of such a substance that has so many uses and positive points is sure to increase in the coming years. Who knows, maybe there is a polyimide in your home as well!
Get more information on Polyimide Sheet [http://www.designwithtorlon.com/#/understanding-torlon/] and Vespel Sheet [http://www.designwithtorlon.com/#/why-torlon/].
5 Steps to choosing the best adhesive for your situation
With the vast array of adhesives and adhesive types available, the process of elimination is the best method to quickly narrow in on the appropriate product.
Step 1
Are there any certifications or qualifications the adhesive must meet?
Step 2
Select the correct technology for the application.
Step 3
What are the application specific requirements?
Step 4
What are the process requirements?
Step 5
TEST
Step 1
Are there any certifications or qualifications the adhesive must meet?
These include MilSpecs, Commercial Standards, NSF or WRAS (for potable water contact), DVGW for water or gas, or perhaps biocompatibility for a medical device.
Step 2
Select the correct technology for the application.
Anaerobics
Anaerobics are adhesives which cure when in contact with metal without contact with air. Anaerobics would include thread locker adhesives, used to lock bolts into nuts.
Cyanoacrylates
Cyanoacrylate adhesives cure through reaction with moisture. A cyanoacrylate adhesive works best with rubber or as a plastics adhesive on small components. They bond most substrates well but have poor durability on glass.
Toughened Acrylics
Toughened acrylics come in one and two part systems and work well on a wide variety of surfaces. Toughened acrylics are quite versatile, working with minimal surface preparation.
Epoxies
Available in one and two part, they offer structural strength on metals but do not excel on plastics. Single part epoxies require ovens to cure them and two part epoxy may require a good bit of time to cure.
Polyurethanes
Polyurethanes are known for their high resistance to low temperatures and are excellent for bonding GRP, or glass fibre reinforced plastics. Polyurethanes are impact resistant and cure quickly with the help of special tools.
Silicones
Silicone adhesive products aren’t incredibly strong, but are quite flexible and resistant to high temperatures. Two-part silicone products tend to work more effectively than the one part products. These are a popular choice for shower and bathtub repairs.
Phenolic
Phenolic require heat and pressure for the curing process but have peen proven to be excellent in bonding metals, or bonding metals to wood.
Polyimides
Polyimides are based on synthetic organic chains. These are available in liquid and film form but tend to be more expensive and tricky to handle efficiently. Polyimides are generally excellent with regards to durability under extreme temperatures.
Hot Melts
Hot melts generally aren’t very strong but work well as an instant adhesive for fast production on components that won’t have much pressure placed on them.
Plastisols
Plastisols require heat in order to cure and generally produce strong, durable joints.
Polyvinyl Acetate, or PVA
PVAs are considered an excellent solution for porous materials, including wood and paper. You can find plenty of polyvinyl acetate in packing and shipping companies.
Pressure Sensitive Adhesives
Pressure sensitive adhesives are durable in various environments and excellent for labeling and on adhesive tapes but really aren’t much of an option for industrial adhesives purposes.
Step 3
What are the application specific requirements?
Surfaces & Substrate
Joint Design, Gap & Strength
Temperature & Environmental Resistance
Step 4
What are the process requirements?
How fast does the adhesive need to be dispensed and cured? Is rapid fixturing required? Will UV light pass through one of the substrates? Are the components temperature sensitive? What viscosity is required to fill the gap in the joint? Is that gap too large for optimum strength?
Review these requirements against adhesive selector guides or individual data sheets.
Step 5
Test! When combining the large number of variables which can affect the bond, the only sure way to know is to test the adhesives in actual conditions.
About the Author
Permabond is a leading manufacturer of engineering adhesives, supplying high-quality industrial adhesives to customers worldwide. Permabond has offices in The Americas, Europe and Asia and a worldwide network of distributors to assist you with your specific bonding and sealing requirements. To learn more, please visit Adhesives.
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