Virgin PTFE And Teflon Mechanical Grades, The Differences

There is often some confusion about the difference between the most common qualities of PTFE, commonly known as Teflon: Grade Virgin, mechanical, or retired. This information will help you understand these two types and their various applications, so you and saves time looking for information.

Materials and Applications

PTFE (polytetrafluoroethylene) is a type of plastic known as the brand name Teflon ®. PTFE resins have a constant temperature of 260 ° C (500 ° F). The mechanical properties begin to degrade above this point.

Both Virgin and mechanical qualities are 100% PTFE material and have similar chemical properties. These are the two types of unfilled PTFE. Other types are available with fillers such as carbon, glass or bronze to improve performance for some applications.

PTFE is an economic mechanism, retired with a little lower than the physical properties of the quality of virgin PTFE, also called "recycled" or "recovered". Recycled material is added during the manufacturing process, typically a few percent, but varies. It is cheaper than virgin. This is the grade used for most applications, for less demanding applications the high-purity materials are not necessary, such as chemicals that are not critical, to electrical and mechanical applications. It has better wear resistance and compressive strength that virgin grade. Not suitable for food contact.

PTFE is a higher grade, pure materials, and is more expensive. It 'made without recycled material, has increased. It is a chemically inert up to 500 ° F, the best chemically resistant material available. Virgin has better physical properties, and maintains flexibility at low temperatures. It's a good electrical insulator, high dielectric properties. It is FDA approved and is used in pharmaceutical, food and beverages and cosmetics. It 'is often used for medical or electrical. PTFE Virgin has better friction characteristics, which may be important in some applications.

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Polyarylate Polymer Coatings

Polyarylate polymer is deposited on a substrate, according to a manufacturing process that ensures a low voltage adhesive coating. A coating is an advantage for use in many industrial applications of great practical importance.

The present invention relates polyarylate polymers and, more particularly, a method of forming a polyarylate polymer coating on a substrate and an article with such a coating.

In a wide range of applications of practical importance is the need for covering a substrate with a layer of material that has the properties required. Sometimes these needs can be met by gluing or otherwise secure a sheet of material on the substrate. But for many important commercial applications, this approach is not entirely satisfactory. Often, a layer more consistent and more adherent than that provided by a coating material applied is required.

Polyarylate polymers are a type of plastic it is known that a number of advantageous features such as excellent electrical, mechanical, thermal and flammability properties. The relative ease with which these materials can be injection molded or extruded led to its use in a variety of industrial applications.

One of the most commercial polyarylate polymer surface is not covered in the reaction chamber of the plasma-assisted etching equipment, as set forth in copending U.S. patent application commonly linked to Ser JM Moran name. N. 295,839, filed Aug. 24, 1981 now U.S. Pat. Ben 4,397,724. Graphically, at least part of the surfaces in the immediate vicinity of the part to consolidate the room is covered with a sheet of polyarylate polymer. The contamination of the work piece during the etching process greatly reduced, as detailed above the application.

In practice, the use of a sheet of polyarylate polymer material attached to a substrate in an etching chamber may lead to buckling or twisting of the polymer material. In addition, some cracking of the material, possibly caused by stresses introduced into the material during the molding or extrusion occurs. And in many cases it is difficult or impossible to place a sheet of polymer in the polyarylate a reliable and consistent adherent to curved surfaces or relatively inaccessible in the etching chamber.

Taking account of the activities listed above are direct employees of the arts initiative aims to polyarylate polymer layer over layer of platforms. But right now, no completely satisfactory procedure for a polymer coating on the substrate is determined. It was noted that if this procedure could be developed, would enable the achievement of polyarylate polymer-coated substrate with improved properties, such as a better grip, better compliance and low stress. Thus, the development of these coatings for use in etching chambers, and various other industrial processes, is very popular destination.

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How To Seal Waterblock Barbs With Teflon Tape

By replacing the tines of a water block, it is likely that there will be some leakage of water. One way to solve this problem is to use a rubber O-Ring works best, I think. But I prefer to use Teflon tape, as it is easy to find and very cheap. Follow these steps to seal Waterblock Barbs:

1.       Cut a piece generous. I use about 15 cm 1 / 2 "Barb. This is only a rough guide. Depending on how you lose the thread you may need more. It does not matter if the edges are cut well.

2.       It is very important to ensure that no Teflon tape when you're screwing unpacking beard. Start with the band from left to right with the beard, who live in the clockwise direction. Press the start of the band firmly in the teeth so that the dark band in the thread and makes good contact. If it sticks, wet the beard / tape a little.

3.       Now carefully wrap the tape around the chin to have two layers on top of another.

4.       Now stretch the tape by pulling it while it wrapped until you are completely done. Make sure it fits perfectly.

5.       After packing the longer trips, on top of about half a strip width of each turn.

6.       When you are done right, you can barely distinguish the different layers on top of another. I marked the end of the strip in the image. If yours is not so clean, so do not worry, Teflon is very forgiving as it is sufficient to fill the holes.

7.       Before installing the catfish, check a little Teflon tape blocking traffic. If so, you can push with your fingernails.

8.       It would be a good resistance, while connecting the Barb with your fingers. If you can barely move his fingers to use a key. Using a key, it should be fairly easy now.

9.       Everything is done and sealed. The white ribbon is not a problem out.

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Detailed Description Of Polymer Coatings Polyarylate

Substrates coated with a stick, and low voltage compliant polyarylate polymer film formed in accordance with the principles of the present invention is useful in various industrial and commercial applications. These applications include the coating of items such as kitchen utensils, with features such as low pollution, high temperature stability and durability and abrasion resistance are important. Graphically, one of the other great this coating is to cover the surfaces of the reaction chamber of the plasma-assisted etching system as a versatile reactive sputtering etching described in the United States. Ben 4,298,443. The contamination of the wafer during the etching process is therefore greatly reduced.

Polyarylate polymers are described in various publications such as polyesters of diphenols and dicarboxylic acids. In this regard, see, for example, new commercial polymers, 1969-1975, revised edition by HG Elias, Gordon, p. 91, 1977, Modern Plastics Encyclopedia, McGraw-Hill, p. 50, 55, 1981, and on the design and plastic, manual office 1982, p. 77-78.

Numerous polyarylate polymers are available. One of the inexpensive, such as a polymer, which is named Ardelia, and available in a variety of specific types named Ardelia 100, 209 and Ardelia Ardelia 213, is made and is available in pellet form by Union Carbide, Bound Brook, NJ (Ardelia polymer is a trademark of Union Carbide.) Traditionally, Ardelia polymer pellets covers many commercial producers, who by molding or extruding, convert the pellets in the form of strips, tapes, discs, rods, plates, etc. One source of this standard is converted Ardelia, for example, in the form of an eighth inch thick, the Westlake Plastics, Lenni, Pa.

Polyarylate other polymers are available in their respective manufacturers in pellet form and are usually treated with commercial manufacturers to form plaques, plates, rods, tapes, etc. Other polymers include U-Polymer made by Unitika Ltd., London, England and polymers Durel made by Hooker Chemical and Plastics Corporation, Niagara Falls, NY (Durel polymer is a registered trademark of Hooker Chemical).

In accordance with the principles of the present invention is a polyarylate polymer coating applied to a substrate, for example, aluminum, magnesium, titanium, stainless steel, ceramic, plastic or glass. Heritage, the focus is redirected to such a coating applied to a substrate made of a metallic material. For an etching by sputtering, the system of the type specified above, the substrate of interest includes a mounting plate member made tray, for example, aluminum. Therefore, the overall objective of the procedure described below, in some cases can be particularized to specify a detailed method specially adapted for coating polymer A polyarylate in such a member of aluminum plate.

Based on a major feature of the present invention discovered, that an applicant is available suitable solvent for dissolving polyarylate polymers. Before specifying the solvent, the focus is first to benefit from the different stages created by the applicant in preparing the substrate surface to be coated. These preparation steps are designed to ensure that the applied coating adhere to the substrate, particularly reliably.

Wash, rinse and abrade the surface of the substrate is desirable. For an aluminum surface, proper washing includes alcohol 1,1,1-trichloroethane, gasoline or industrial. Subsequently, standard abrasion with glass beads is effective in removing the oxide layer. This is usually followed by a step running using aluminum oxide or silicon carbide powder. Rinse the surface with, for example, 1,1,1-trichloroethane is then performed.

Subsequently, a specific feature of this invention, it is worth before finishing the surface of the polyarylate polymer substrate form a closed surface of the intermediate layer. In one embodiment, the middle layer of a porous material, which serves the anchoring effect of the polymer coating material applied to the substrate. Excellent adhesion to the plastic coating is thus achieved.

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